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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
What is the capital of West Virginia? | [
"Saint Louis",
"Huntington",
"Billings",
"Charleston",
"I don't know"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. | D | 300 | |||
What is the name of the colony shown? | [
"Rhode Island",
"Maryland",
"Washington, D.C.",
"New York",
"I don't know"
] | 1 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Maryland. | B | 301 | |||
Which of the following best describes a population in the Camargue wetlands? | [
"the microscopic algae and the brine shrimp",
"a flock of greater flamingos",
"the salty water and the tamarisk trees",
"None of the above",
"I don't know"
] | 1 | Read the passage. Then answer the question below.
During the wet season, there are heavy rains, and the salty ponds in the Camargue wetland in France fill with water. During the dry season, the ponds lose water, and the remaining water becomes saltier. Some plants, such as tamarisk trees, can live in this changing env... | closed choice | grade7 | natural science | biology | Ecosystems | Describe populations, communities, and ecosystems | In an environment, organisms interact with each other and with their nonliving surroundings. To help describe these interactions, ecologists use specific terms for different types of groups.
A single organism is an individual. Individuals of the same species that live in the same place are part of a population.
Multipl... | B | 302 | ||
What is the probability that a cat produced by this cross will have long fur? | [
"1/4",
"4/4",
"3/4",
"2/4",
"0/4"
] | 0 | In a group of cats, some individuals have short fur and others have long fur. In this group, the gene for the fur length trait has two alleles. The allele for short fur (F) is dominant over the allele for long fur (f).
This Punnett square shows a cross between two cats. | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate probabilities of offspring types | Offspring phenotypes: dominant or recessive?
How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to a... | A | 303 | ||
What is the capital of Washington? | [
"Spokane",
"Salem",
"Seattle",
"Olympia",
"I don't know"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Olympia is the capital of Washington. | D | 304 | |||
Which of these states is farthest east? | [
"Iowa",
"North Dakota",
"Washington",
"Kentucky",
"I don't know"
] | 3 | closed choice | grade2 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the east arrow is pointing. Kentucky is farthest east. | D | 305 | ||
In this experiment, which were part of a control group? | [
"the snowboards with wax removed",
"the snowboards with wax added",
"All of the above",
"None of the above",
"I don't know"
] | 0 | The passage below describes an experiment.
Jeanette and Bryant were taking a snowboarding class. During the class, their instructor said they would go faster if they applied wax to the undersides of their snowboards.
After the class, Jeanette applied a thin layer of wax to the underside of a snowboard and rode the boa... | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify control and experimental groups | Experiments have variables, or parts that change. You can design an experiment to investigate whether changing a variable between different groups has a specific outcome.
For example, imagine you want to find out whether adding fertilizer to soil affects the height of pea plants. You could investigate this question wit... | In this experiment, Jeanette and Bryant investigated whether adding wax to snowboards affects their speed. There was no wax on the snowboards with wax removed. So, they were part of a control group. | A | 306 | |
Which material is this magnifying glass made of? | [
"linen",
"plastic",
"All of the above",
"None of the above",
"I don't know"
] | 1 | closed choice | grade2 | natural science | physics | Materials | Identify multiple materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials.
Some objects are made of just one material.
Most nails are made of metal.
Other objects are made of more than one material.
This hammer is made of metal and wood. | Look at the picture of the magnifying glass.
The magnifying glass is made of two different materials. The handle is made of plastic, and the lens is made of glass. | B | 307 | ||
What is the capital of Alaska? | [
"Fairbanks",
"Olympia",
"Anchorage",
"Juneau",
"I don't know"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Juneau is the capital of Alaska. | D | 308 | |||
Select the organism in the same species as the marbled salamander. | [
"Taricha torosa",
"Lissotriton helveticus",
"Ambystoma opacum",
"None of the above",
"I don't know"
] | 2 | This organism is a marbled salamander. Its scientific name is Ambystoma opacum. | closed choice | grade4 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A marbled salamander's scientific name is Ambystoma opacum.
Ambystoma opacum has the same scientific name as a marbled salamander. So, these organisms are in the same species.
Lissotriton helveticus does not have the same scientific name as a marbled salamander. So, Ambystoma opacum and Lissotriton helveticus are not i... | C | 309 | |
What is the name of the colony shown? | [
"Rhode Island",
"New Hampshire",
"Massachusetts",
"Connecticut",
"I don't know"
] | 3 | closed choice | grade5 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is Connecticut. | D | 310 | |||
What is the capital of Pennsylvania? | [
"Dover",
"Sacramento",
"Concord",
"Harrisburg",
"I don't know"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Northeast | Harrisburg is the capital of Pennsylvania. | D | 311 | |||
Which of these cities is marked on the map? | [
"San Diego",
"San Francisco",
"Las Vegas",
"Salt Lake City",
"I don't know"
] | 3 | closed choice | grade4 | social science | geography | Cities | Cities of the West | The city is Salt Lake City, Utah. San Francisco, Las Vegas, and San Diego are marked with gray circles on the map below. | D | 312 | |||
Select the reptile below. | [
"Nile crocodile",
"sea otter",
"arroyo toad",
"leafy seadragon",
"I don't know"
] | 0 | Reptiles have scaly, waterproof skin. Most reptiles live on land.
Reptiles are cold-blooded. The body temperature of cold-blooded animals depends on their environment.
A box turtle is an example of a reptile. | closed choice | grade4 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification.
Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. | A Nile crocodile is a reptile. It has scaly, waterproof skin.
Crocodiles hunt their prey in or near water.
A leafy seadragon is a fish. It lives underwater. It has fins, not limbs.
A seadragon's body looks like a clump of seaweed. This helps the seadragon hide from its predators.
An arroyo toad is an amphibian. It has ... | A | 313 | |
Which animal's feet are also adapted to walk on snow and ice? | [
"tokay gecko",
"Siberian tiger",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Snow leopards live in the snowy mountains of central Asia. The 's feet are adapted for walking on snow and ice.
Figure: snow leopard. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: feet and limbs | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur m... | Look at the picture of the snow leopard.
The snow leopard has furry feet with large pads. Its feet are adapted to walk on snow and ice. The fur can help keep the snow leopard's feet warm. The large pads help spread its weight over a larger area. This allows it to walk on ice without slipping and to walk on snow without... | B | 314 | |
What is the capital of Wyoming? | [
"Laramie",
"Cheyenne",
"Helena",
"Minneapolis",
"I don't know"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Cheyenne is the capital of Wyoming. | B | 315 | |||
Which property do these four objects have in common? | [
"rough",
"flexible",
"opaque",
"None of the above",
"I don't know"
] | 2 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
An opaque object does not let light through. All four objects are opaque.
A flexible object can be folded or bent without breaking easily. The hair clip is flexible, but the building blocks are not.
A rough object feels scratchy when you touch it. Th... | C | 316 | |
What is the capital of Wisconsin? | [
"Madison",
"Green Bay",
"Milwaukee",
"Topeka",
"I don't know"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Midwest | Madison is the capital of Wisconsin. | A | 317 | |||
Select the bird below. | [
"kangaroo",
"flamingo",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Birds have feathers, two wings, and a beak. A red-tailed hawk is an example of a bird. | closed choice | grade2 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common.
Scientists sort animals into groups based on traits they have in common. This process is called classification. | A flamingo is a bird. It has feathers, two wings, and a beak.
A kangaroo is a mammal. It has fur and feeds its young milk. | B | 318 | |
Which country is highlighted? | [
"the Dominican Republic",
"Dominica",
"Saint Vincent and the Grenadines",
"Barbados",
"I don't know"
] | 1 | closed choice | grade7 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Dominica. | B | 319 | |||
Which country is highlighted? | [
"Kiribati",
"Samoa",
"Tonga",
"Fiji",
"I don't know"
] | 2 | closed choice | grade8 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Tonga. | C | 320 | |||
Is the following statement about our solar system true or false?
Jupiter's volume is more than 10,000 times as large as the volume of Mars. | [
"true",
"false",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Use the data to answer the question below. | true-or false | grade8 | natural science | earth-science | Astronomy | Analyze data to compare properties of planets | A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.
The volume of a planet is a very large quantity. Large quantities such as this are often written in scientific notation.
For ex... | To determine if this statement is true, calculate the value of 10,000 times the volume of Mars.
Then compare the result to the volume of Jupiter. Jupiter's volume is 1.43 x 10^15 km^3, which is less than 1.63 x 10^15 km^3. So, Jupiter's volume is less than 10,000 times as large as the volume of Mars. | B | 321 | |
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is greater in Pair 2.",
"The magnitude of the magnetic force is greater in Pair 1.",
"None of the above",
"I don't know"
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes. | closed choice | grade7 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | Distance affects the magnitude of the magnetic force. When there is a smaller distance between magnets, the magnitude of the magnetic force between them is greater.
There is a smaller distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1. | B | 322 | |
Which better describes the Pisgah National Forest ecosystem? | [
"It has soil that is poor in nutrients. It also has only a few types of trees.",
"It has soil that is rich in nutrients. It also has only a few types of trees.",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Figure: Pisgah National Forest.
The Pisgah National Forest is a temperate deciduous forest ecosystem in western North Carolina. | closed choice | grade4 | natural science | biology | Ecosystems | Describe ecosystems | An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestri... | A temperate deciduous forest is a type of ecosystem. Temperate deciduous forests have the following features: warm, wet summers and cold, wet winters, soil that is rich in nutrients, and only a few types of trees. So, the Pisgah National Forest has soil that is rich in nutrients. It also has only a few types of trees. | B | 323 | |
What is the name of the colony shown? | [
"Rhode Island",
"Connecticut",
"Massachusetts",
"New Hampshire",
"I don't know"
] | 2 | closed choice | grade7 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Massachusetts.
The Massachusetts Colony included land that would later become the state of Maine. Maine was never its own colony. | C | 324 | |||
What is the direction of this push? | [
"away from the soccer player's foot",
"toward the soccer player's foot",
"All of the above",
"None of the above",
"I don't know"
] | 0 | A soccer player kicks the ball with his foot to score. His foot pushes the ball to the goal. | closed choice | grade2 | natural science | physics | Force and motion | Identify pushes and pulls | One object can make another object move with a push or a pull.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The soccer player's kick is a type of push. The soccer player kicks the ball away from his foot to score a goal. The direction of the push is away from the soccer player's foot. | A | 325 | |
What can Hannah and Wendy trade to each get what they want? | [
"Wendy can trade her almonds for Hannah's tomatoes.",
"Wendy can trade her broccoli for Hannah's oranges.",
"Hannah can trade her tomatoes for Wendy's carrots.",
"Hannah can trade her tomatoes for Wendy's broccoli.",
"I don't know"
] | 3 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Hannah and Wendy open their lunch boxes in the school cafeteria. Neither Hannah nor Wendy got everything that they wanted. The ta... | closed choice | grade7 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Hannah wants broccoli. Wendy wants tomatoes. They can trade tomatoes for broccoli to both get what they want. Trading other things would not help both people get more items they want. | D | 326 | ||
Which country is highlighted? | [
"the Federated States of Micronesia",
"Nauru",
"the Marshall Islands",
"Kiribati",
"I don't know"
] | 2 | closed choice | grade8 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is the Marshall Islands.
Does the Marshall Islands have any territorial disputes?
The Marshall Islands claims to own Wake Island, which is a disputed territory. In other words, multiple countries or groups claim that the area rightfully belongs to them.
The United States claimed Wake Island in 1899 and has... | C | 327 | |||
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is smaller in Pair 2.",
"The magnitude of the magnetic force is smaller in Pair 1.",
"None of the above",
"I don't know"
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different sizes. | closed choice | grade5 | natural science | physics | Magnets | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force.
Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the ... | C | 328 | |
What is the capital of Connecticut? | [
"New Haven",
"Hartford",
"Trenton",
"Newport",
"I don't know"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Northeast | Hartford is the capital of Connecticut. | B | 329 | |||
Select the organism in the same species as the gray heron. | [
"Ardea cinerea",
"Hyla cinerea",
"Lonicera japonica",
"None of the above",
"I don't know"
] | 0 | This organism is a gray heron. Its scientific name is Ardea cinerea. | closed choice | grade8 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A gray heron's scientific name is Ardea cinerea.
Lonicera japonica does not have the same scientific name as a gray heron. So, Ardea cinerea and Lonicera japonica are not in the same species.
Hyla cinerea does have the same species within its genus as a gray heron, but they are not in the same genus! They do not have t... | A | 330 | |
Which continent is highlighted? | [
"Australia",
"Asia",
"South America",
"North America",
"I don't know"
] | 3 | closed choice | grade5 | social science | geography | Oceans and continents | Identify oceans and continents | A continent is one of the major land masses on the earth. Most people say there are seven continents. | This continent is North America. | D | 331 | ||
What can Gabe and Maddie trade to each get what they want? | [
"Gabe can trade his tomatoes for Maddie's carrots.",
"Maddie can trade her broccoli for Gabe's oranges.",
"Maddie can trade her almonds for Gabe's tomatoes.",
"Gabe can trade his tomatoes for Maddie's broccoli.",
"I don't know"
] | 3 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Gabe and Maddie open their lunch boxes in the school cafeteria. Neither Gabe nor Maddie got everything that they wanted. The tabl... | closed choice | grade8 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Gabe wants broccoli. Maddie wants tomatoes. They can trade tomatoes for broccoli to both get what they want. Trading other things would not help both people get more items they want. | D | 332 | ||
Which animal's feet are also adapted for digging? | [
"manatee",
"honey badger",
"All of the above",
"None of the above",
"I don't know"
] | 1 | s are found in parts of Europe. They dig and live in burrows. The feet of the are adapted for digging.
Figure: Alpine marmot. | closed choice | grade4 | natural science | biology | Adaptations | Animal adaptations: feet and limbs | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur m... | Look at the picture of the Alpine marmot.
The Alpine marmot has long, straight claws. Its feet are adapted for digging. The Alpine marmot uses its claws to break up soil and move it out of the way.
Now look at each animal. Figure out which animal has a similar adaptation.
The honey badger has long, straight claws. Its ... | B | 333 | |
Which country is highlighted? | [
"Saint Kitts and Nevis",
"Cuba",
"Antigua and Barbuda",
"Barbados",
"I don't know"
] | 2 | closed choice | grade8 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Antigua and Barbuda. | C | 334 | |||
Which material is this handsaw made of? | [
"metal",
"glass",
"All of the above",
"None of the above",
"I don't know"
] | 0 | closed choice | grade2 | natural science | physics | Materials | Identify multiple materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials.
Some objects are made of just one material.
Most nails are made of metal.
Other objects are made of more than one material.
This hammer is made of metal and wood. | Look at the picture of the handsaw.
The handsaw is made of two different materials. The handle is made of wood. The rest of the saw is made of metal. | A | 335 | ||
Which of these states is farthest north? | [
"Iowa",
"Georgia",
"Oklahoma",
"Mississippi",
"I don't know"
] | 0 | closed choice | grade2 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the north arrow is pointing. Iowa is farthest north. | A | 336 | ||
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is greater in Pair 1.",
"The magnitude of the magnetic force is greater in Pair 2.",
"None of the above",
"I don't know"
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different sizes. | closed choice | grade7 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them.
Magnet A is the same size in both pairs. But Magnet B is larger in Pair 2 than in Pair 1. So, the magnitud... | C | 337 | |
Select the organism in the same genus as the American white pelican. | [
"Pelecanus philippensis",
"Strix uralensis",
"Ardea herodias",
"None of the above",
"I don't know"
] | 0 | This organism is an American white pelican. Its scientific name is Pelecanus erythrorhynchos. | closed choice | grade7 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | An American white pelican's scientific name is Pelecanus erythrorhynchos. The first word of its scientific name is Pelecanus.
Ardea herodias is in the genus Ardea. The first word of its scientific name is Ardea. So, Ardea herodias and Pelecanus erythrorhynchos are not in the same genus.
Pelecanus philippensis is in the... | A | 338 | |
Complete the sentence.
The Aden Ridge formed at a () boundary. | [
"convergent",
"divergent",
"transform",
"None of the above",
"I don't know"
] | 1 | Read the passage and look at the picture.
The Aden Ridge began to form millions of years ago as the Somalian Plate and the Arabian Plate moved away from each other. The plates are slowly moving apart at a rate of about 2 centimeters per year. On the map, the ridge is shown in the Gulf of Aden, between the countries of ... | closed choice | grade8 | natural science | earth-science | Plate tectonics | Describe tectonic plate boundaries around the world | The outer layer of Earth is broken up into many pieces called tectonic plates, or simply plates. The breaks between plates are called plate boundaries. Plate boundaries are classified by the way the plates are moving relative to each other:
At a transform boundary, two plates are sliding past each other.
At a convergen... | To figure out what type of plate boundary formed the Aden Ridge, you need to know how the tectonic plates interacted. To find this out, read the passage carefully.
The Aden Ridge began to form millions of years ago as the Somalian Plate and the Arabian Plate moved away from each other. The plates are slowly moving apar... | B | 339 | |
Which property do these three objects have in common? | [
"transparent",
"bouncy",
"sour",
"None of the above",
"I don't know"
] | 0 | Select the best answer. | closed choice | grade4 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
You can see clearly through a transparent object. All three objects are transparent.
A bouncy object will bounce back from the floor if you drop it. None of the objects are bouncy.
A lemon has a sour taste. The water is not sour.
The property that al... | A | 340 | |
What is the probability that a pea plant produced by this cross will be heterozygous for the stem height gene? | [
"4/4",
"1/4",
"0/4",
"2/4",
"3/4"
] | 3 | In a group of pea plants, some individuals have a tall stem and others have a short stem. In this group, the gene for the stem height trait has two alleles. The allele for a short stem (h) is recessive to the allele for a tall stem (H).
This Punnett square shows a cross between two pea plants. | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate probabilities of offspring types | Offspring genotypes: homozygous or heterozygous?
How do you determine whether an organism is homozygous or heterozygous for a gene? Look at the alleles in the organism's genotype for that gene.
An organism with two identical alleles for a gene is homozygous for that gene.
If both alleles are dominant, the organism is h... | D | 341 | ||
Which country is highlighted? | [
"Papua New Guinea",
"the Federated States of Micronesia",
"the Marshall Islands",
"Palau",
"I don't know"
] | 1 | closed choice | grade6 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is the Federated States of Micronesia. | B | 342 | |||
Which of these states is farthest east? | [
"Utah",
"Arkansas",
"Georgia",
"Pennsylvania",
"I don't know"
] | 3 | closed choice | grade4 | social science | geography | Maps | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the east arrow is pointing. Pennsylvania is farthest east. | D | 343 | ||
Which statement is true about the average monthly precipitation in Nairobi? | [
"More precipitation falls in April than in August.",
"Nairobi gets about the same amount of precipitation each month.",
"More precipitation falls in September than in November.",
"None of the above",
"I don't know"
] | 0 | Use the graph to answer the question below. | closed choice | grade3 | natural science | earth-science | Weather and climate | Use climate data to make predictions | Scientists record climate data from places around the world. Precipitation, or rain and snow, is one type of climate data.
A bar graph can be used to show the average amount of precipitation each month. Months with taller bars have more precipitation on average. | To describe the average precipitation trends in Nairobi, look at the graph.
Choice "Apr" is incorrect.
Choice "Aug" is incorrect.
Choice "Sep" is incorrect.
Choice "Nov" is incorrect.
Choice "More precipitation falls in April than in August." is incorrect.
April has a higher average monthly precipitation than August.
C... | A | 344 | |
Why might covering its eggs with its body increase the reproductive success of a snail leech? Complete the claim below that answers this question and is best supported by the passage.
Covering its eggs with its body increases the chances that (). | [
"the leech's eggs will hatch",
"the leech will not eat for up to a week",
"the leech will fight a water snail",
"None of the above",
"I don't know"
] | 0 | Animals often behave in certain ways that can increase their reproductive success. Read the passage about a specific animal behavior. Then, follow the instructions below.
The snail leech is a type of worm that often lives in freshwater streams. After reproduces, it attaches its eggs to a rock at the bottom of the str... | closed choice | grade8 | natural science | literacy-in-science | Adaptations and natural selection | How can animal behaviors affect reproductive success? Identify evidence to support a claim | Animals increase their reproductive success when they have offspring that survive to reproduce.
Animals can increase their chances of having offspring by behaving in ways that help them get partners to mate and reproduce with. These partners are called mates. For example, animals may make special sounds, perform specif... | Look for the part of the passage that describes the effect of covering its eggs with its body. Use this information to determine why this behavior can increase the reproductive success of the snail leech.
Choice "The snail leech is a type of worm that often lives in freshwater streams. After a snail leech reproduces, i... | A | 345 | |
What is the capital of New Mexico? | [
"Honolulu",
"Sacramento",
"Santa Fe",
"Juneau",
"I don't know"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Santa Fe is the capital of New Mexico. | C | 346 | |||
What is the direction of this pull? | [
"away from the center of Earth",
"toward the center of Earth",
"All of the above",
"None of the above",
"I don't know"
] | 1 | A woman pours hot water from a teapot. The force of Earth's gravity pulls the water downward so that it falls into the teacup. | closed choice | grade4 | natural science | physics | Force and motion | Identify directions of forces | A force is a push or a pull that one object applies to another. Every force has a direction.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The force of Earth's gravity pulls the hot water downward. The direction of the pull is toward the center of Earth. | B | 347 | |
Which country is highlighted? | [
"Tonga",
"Tuvalu",
"the Marshall Islands",
"Fiji",
"I don't know"
] | 1 | closed choice | grade6 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Tuvalu. | B | 348 | |||
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is greater in Pair 2.",
"The magnitude of the magnetic force is greater in Pair 1.",
"None of the above",
"I don't know"
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade6 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | Distance affects the magnitude of the magnetic force. When there is a smaller distance between magnets, the magnitude of the magnetic force between them is greater.
There is a smaller distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1. | B | 349 | |
Is Sequoia sempervirens made up of one cell? | [
"no",
"yes",
"All of the above",
"None of the above",
"I don't know"
] | 0 | This organism is Sequoia sempervirens. It is a member of the plant kingdom.
Sequoia sempervirens is commonly called a coast redwood. The tallest known tree in the world is a coast redwood tree. It is 379 feet tall and over 700 years old! | yes or no | grade4 | natural science | biology | Classification | Describe, classify, and compare kingdoms | In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms.
Organisms in each kingdom have specific traits. The table below sho... | Sequoia sempervirens is a plant. Plants are made up of many cells. | A | 350 | |
What is this trapdoor spider's scientific name? | [
"Aptostichus serrano",
"Aptostichus barackobamai",
"All of the above",
"None of the above",
"I don't know"
] | 1 | This species of trapdoor spider was named after President Barack Obama. The species was first discovered in Northern California in 2012. | closed choice | grade4 | natural science | biology | Scientific names | Origins of scientific names | When a scientist identifies a new organism, he or she chooses its scientific name.
Sometimes, an organism is named after the place where it was first found. Other times, an organism is named after the scientist who first identified it. Or, the scientific name might describe the organism's physical traits.
Many of the w... | This organism's scientific name refers to President Barack Obama.
The word barackobamai refers to President Barack Obama. So, this trapdoor spider's scientific name is Aptostichus barackobamai. | B | 351 | |
Is the wind turning a pinwheel a solid, a liquid, or a gas? | [
"a solid",
"a gas",
"a liquid",
"None of the above",
"I don't know"
] | 1 | closed choice | grade4 | natural science | physics | States of matter | Identify and sort solids, liquids, and gases | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a... | Wind turning a pinwheel is air that is moving! Air is a gas. The air expands to fill the space around the pinwheel. | B | 352 | ||
Select the organism in the same genus as the black-footed cat. | [
"Felis nigripes",
"Erinaceus europaeus",
"Phoebastria nigripes",
"None of the above",
"I don't know"
] | 0 | This organism is a black-footed cat. Its scientific name is Felis nigripes. | closed choice | grade8 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A black-footed cat's scientific name is Felis nigripes. The first word of its scientific name is Felis.
Phoebastria nigripes and Felis nigripes are not in the same genus.
These organisms are not in the same genus, but part of their scientific names is the same. Phoebastria nigripes and Felis nigripes have the same spec... | A | 353 | |
Select the organism in the same species as the mountain zebra. | [
"Equus zebra",
"Macropus giganteus",
"Macropus rufus",
"None of the above",
"I don't know"
] | 0 | This organism is a mountain zebra. Its scientific name is Equus zebra. | closed choice | grade4 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A mountain zebra's scientific name is Equus zebra.
Macropus rufus does not have the same scientific name as a mountain zebra. So, Equus zebra and Macropus rufus are not in the same species.
Macropus giganteus does not have the same scientific name as a mountain zebra. So, Equus zebra and Macropus giganteus are not in t... | A | 354 | |
Is chalcopyrite a mineral or a rock? | [
"rock",
"mineral",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Chalcopyrite has the following properties:
fixed crystal structure
found in nature
metallic luster
pure substance
not made by living things
solid | closed choice | grade8 | natural science | earth-science | Rocks and minerals | Identify rocks and minerals | Minerals are the building blocks of rocks. A rock can be made of one or more minerals.
Minerals and rocks have the following properties:
Property | Mineral | Rock
It is a solid. | Yes | Yes
It is formed in nature. | Yes | Yes
It is not made by organisms. | Yes | Yes
It is a pure substance. | Yes | No
It has a fixed cry... | Chalcopyrite has all the properties of a mineral. So, chalcopyrite is a mineral. | B | 355 | |
Is coffee a solid, a liquid, or a gas? | [
"a gas",
"a liquid",
"a solid",
"None of the above",
"I don't know"
] | 1 | closed choice | grade2 | natural science | physics | States of matter | Classify matter as solid, liquid, or gas | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a shape of its own.
Some solids can be bent or broken easily. Others are hard to bend or break.
A glass cup is a solid. A sock is also a solid.
When matter i... | Coffee is a liquid. A liquid takes the shape of any container it is in.
If you pour coffee into a different container, the coffee will take the shape of that container. But the coffee will still take up the same amount of space. | B | 356 | ||
Is silk a mineral? | [
"yes",
"no",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Silk has the following properties:
solid
made by a silkmoth caterpillar
no fixed crystal structure
found in nature
not a pure substance | yes or no | grade5 | natural science | earth-science | Rocks and minerals | Identify rocks and minerals | Properties are used to identify different substances. Minerals have the following properties:
It is a solid.
It is formed in nature.
It is not made by organisms.
It is a pure substance.
It has a fixed crystal structure.
If a substance has all five of these properties, then it is a mineral.
Look closely at the last thre... | A silkmoth caterpillar makes a silk cocoon to protect itself during metamorphosis. In a silk factory, the silk from many silkmoth cocoons is spun into fabric. Silkmoth caterpillars that are used to make silk are often called silkworms. | B | 357 | |
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is stronger in Pair 2.",
"The magnetic force is stronger in Pair 1.",
"The strength of the magnetic force is the same in both pairs.",
"None of the above",
"I don't know"
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade4 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You c... | Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger.
The magnets in Pair 1 are closer together than the magnets in Pair 2. So, the magnetic force is stronger in Pair 1 than in Pair 2. | B | 358 | |
Which type of force from the woman's hand moves the book off of the shelf? | [
"push",
"pull",
"All of the above",
"None of the above",
"I don't know"
] | 1 | A woman takes a book off of a bookshelf. Her hand applies a force to the book. | closed choice | grade3 | natural science | physics | Force and motion | Identify pushes and pulls | A force is a push or a pull that one object applies to a second object.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The woman's hand applies a force to the book.This force moves the book off the shelf. The direction of this force is toward her hand. This force is a pull. | B | 359 | |
Which country is highlighted? | [
"Grenada",
"Saint Vincent and the Grenadines",
"Barbados",
"Antigua and Barbuda",
"I don't know"
] | 1 | closed choice | grade7 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Saint Vincent and the Grenadines. | B | 360 | |||
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is stronger in Pair 1.",
"The magnetic force is stronger in Pair 2.",
"None of the above",
"I don't know"
] | 0 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade3 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. | Distance affects the strength of the magnetic force. But the distance between the magnets in Pair 1 and in Pair 2 is the same.
So, the strength of the magnetic force is the same in both pairs. | A | 361 | |
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample B",
"neither; the samples have the same temperature",
"sample A",
"None of the above",
"I don't know"
] | 0 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | The particles in both samples have the same average speed, but each particle in sample B has more mass than each particle in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A.
Because the particles in sample B have the higher average kinetic energy, sample B mus... | A | 362 | |
Which country is highlighted? | [
"the Marshall Islands",
"Nauru",
"the Federated States of Micronesia",
"Solomon Islands",
"I don't know"
] | 0 | closed choice | grade6 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is the Marshall Islands.
Does the Marshall Islands have any territorial disputes?
The Marshall Islands claims to own Wake Island, which is a disputed territory. In other words, multiple countries or groups claim that the area rightfully belongs to them.
The United States claimed Wake Island in 1899 and has... | A | 363 | |||
Which material is this trombone made of? | [
"metal",
"ceramic",
"All of the above",
"None of the above",
"I don't know"
] | 0 | closed choice | grade3 | natural science | physics | Materials | Identify materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials. | Look at the picture of the trombone.
The trombone is made of metal.
Many musical instruments are made of metal. Metal can be made into many shapes. Musical instruments with different shapes make different sounds. | A | 364 | ||
What is the capital of Illinois? | [
"Springfield",
"Salt Lake City",
"Chicago",
"Saint Paul",
"I don't know"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Midwest | Springfield is the capital of Illinois. | A | 365 | |||
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample A",
"neither; the samples have the same temperature",
"sample B",
"None of the above",
"I don't know"
] | 2 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | Each particle in the two samples has the same mass, but the particles in sample B have a higher average speed than the particles in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A.
Because the particles in sample B have the higher average kinetic energy, sampl... | C | 366 | |
According to the map, which of the following statements is true about North America in the early colonial era? | [
"The Dutch controlled the most territory in eastern North America.",
"Several European countries claimed land in North America.",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Look at the map of North America in the early colonial era, or the 1600s and early 1700s. Then answer the question below. | closed choice | grade7 | social science | us-history | Colonial America | Life as a colonist | B | 367 | |||
Which country is highlighted? | [
"Papua New Guinea",
"Kiribati",
"Tuvalu",
"Tonga",
"I don't know"
] | 2 | closed choice | grade7 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Tuvalu. | C | 368 | |||
Which material is this necktie made of? | [
"plastic",
"silk",
"All of the above",
"None of the above",
"I don't know"
] | 1 | closed choice | grade3 | natural science | physics | Materials | Identify materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials. | Look at the picture of the necktie.
The necktie is made of silk.
Silk comes from small insects called silk moths. The silk moth caterpillars spin cocoons out of silk thread. Humans use the silk thread to make fabric. | B | 369 | ||
Does this passage describe the weather or the climate? | [
"climate",
"weather",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Figure: Cape Verde.
Trade winds are steady winds that blow towards the equator. On Thursday, they were blowing strong from the north in Cape Verde.
Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place. | closed choice | grade6 | natural science | earth-science | Weather and climate | Weather and climate around the world | The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pattern of ... | Read the passage carefully.
Trade winds are steady winds that blow towards the equator. On Thursday, they were blowing strong from the north in Cape Verde.
The underlined part of the passage tells you about the wind direction in Cape Verde on Thursday. This passage describes the atmosphere at a certain place and time. ... | B | 370 | |
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"neither; the samples have the same temperature",
"sample B",
"sample A",
"None of the above",
"I don't know"
] | 2 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade6 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | Each particle in sample A has more mass than each particle in sample B. The particles in sample A also have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average ... | C | 371 | |
Which property matches this object? | [
"yellow",
"bendable",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Identify properties of an object | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. | Look at the object.
Think about each property.
Yellow is a color.
This color is yellow. The apron is not yellow.
A bendable object can be bent without breaking. The apron is bendable. | B | 372 | |
Which solution has a higher concentration of yellow particles? | [
"Solution B",
"neither; their concentrations are the same",
"Solution A",
"None of the above",
"I don't know"
] | 1 | The diagram below is a model of two solutions. Each yellow ball represents one particle of solute. | closed choice | grade6 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the yellow particles represent the solute. To figure out which solution has a higher concentration of yellow particles, look at both the number of yellow particles and the volume of the solvent in each container.
Use the concentration formula to find the number of yellow particles per mill... | B | 373 | |
Is a juice pop a solid, a liquid, or a gas? | [
"a liquid",
"a solid",
"a gas",
"None of the above",
"I don't know"
] | 1 | closed choice | grade4 | natural science | physics | States of matter | Identify and sort solids, liquids, and gases | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a... | A juice pop is a solid. A solid has a size and shape of its own.
If you take a juice pop out of the freezer, it will melt. While a juice pop is frozen, though, it is a solid. | B | 374 | ||
Which animal's mouth is also adapted to tear through meat? | [
"nutria",
"tiger",
"All of the above",
"None of the above",
"I don't know"
] | 1 | s are carnivores, or meat eaters. They eat fish, mammals, and other reptiles. The crocodile's mouth is adapted to tear through meat.
Figure: Nile crocodile. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear ... | Look at the picture of the Nile crocodile.
The Nile crocodile has a large mouth and sharp teeth. Its mouth is adapted to tear through meat. The Nile crocodile uses its large mouth to grab its prey. It uses its sharp teeth to cut up the meat of the prey into pieces it can swallow.
Now look at each animal. Figure out whi... | B | 375 | |
Complete the sentence.
is what happens when pollen lands on a female cone. | [
"Pollination",
"Fertilization",
"Photosynthesis",
"None of the above",
"I don't know"
] | 0 | Male cones make pollen. Wind can blow pollen from a male cone to a female cone. | closed choice | grade4 | natural science | biology | Plants | Describe and construct conifer life cycles | Conifers are plants that grow cones. Conifers use their cones to reproduce, or make new plants like themselves. How do conifers use their cones to reproduce?
Conifers can grow male and female cones. Male cones make pollen, and female cones make eggs. Pollination is what happens when wind blows pollen from male cones on... | When pollen lands on a female cone, it is called pollination. This photograph shows wind blowing pollen from the male cones on a Japanese cedar tree.
Photosynthesis happens when plants use water, carbon dioxide, and energy from sunlight to make sugar. | A | 376 | |
What is the capital of California? | [
"Carson City",
"Honolulu",
"Los Angeles",
"Sacramento",
"I don't know"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify the 50 state capitals | Sacramento is the capital of California. | D | 377 | |||
Complete the text to describe the diagram.
Solute particles moved in both directions across the permeable membrane. But more solute particles moved across the membrane (). When there was an equal concentration on both sides, the particles reached equilibrium. | [
"to the right than to the left",
"to the left than to the right",
"All of the above",
"None of the above",
"I don't know"
] | 1 | The diagram below shows a solution with one solute. Each solute particle is represented by a pink ball. The solution fills a closed container that is divided in half by a membrane. The membrane, represented by a dotted line, is permeable to the solute particles.
The diagram shows how the solution can change over time d... | closed choice | grade6 | natural science | chemistry | Solutions | Diffusion across membranes | In a solution, solute particles move and spread throughout the solvent. The diagram below shows how a solution can change over time. Solute particles move from the area where they are at a higher concentration to the area where they are at a lower concentration. This movement happens through the process of diffusion.
A... | Look at the diagram again. It shows you how the solution changed during the process of diffusion.
Before the solute particles reached equilibrium, there was 1 solute particle on the left side of the membrane and 5 solute particles on the right side of the membrane.
When the solute particles reached equilibrium, there w... | B | 378 | |
Complete the statement.
Ozone is (). | [
"a compound",
"an elementary substance",
"All of the above",
"None of the above",
"I don't know"
] | 1 | The model below represents a molecule of ozone. zone gas in the atmosphere protects living things on Earth from some of the Sun's harmful rays. | closed choice | grade7 | natural science | chemistry | Atoms and molecules | Classify elementary substances and compounds using models | There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you.
A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are ... | Use the model to determine whether ozone is an elementary substance or a compound.
Step 1: Interpret the model.
In the ball-and-stick model shown above, all of the balls are the same color:
. The legend shows that red represents the chemical element with the atomic symbol O. O is the atomic symbol for the chemical elem... | B | 379 | |
What is the capital of Arizona? | [
"Provo",
"Phoenix",
"Honolulu",
"Tucson",
"I don't know"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify the 50 state capitals | Phoenix is the capital of Arizona. | B | 380 | |||
Which better describes the New England Seamount Chain ecosystem? | [
"It has shallow water. It also has organisms that crawl or stick to the ground.",
"It has water at the bottom of the ocean. It also has organisms that crawl or stick to the ground.",
"All of the above",
"None of the above",
"I don't know"
] | 1 | Figure: New England Seamount Chain.
The New England Seamount Chain is a deep sea ecosystem in the northern Atlantic Ocean. | closed choice | grade3 | natural science | biology | Ecosystems | Describe ecosystems | An ecosystem is formed when living and nonliving things interact in an environment. There are many types of ecosystems. Here are some ways in which ecosystems can differ from each other:
the pattern of weather, or climate
the type of soil or water
the organisms that live there | The deep sea is a type of ecosystem. Deep sea ecosystems have the following features: water at the bottom of the ocean, no sunlight, and organisms that crawl or stick to the ground. So, the New England Seamount Chain has water at the bottom of the ocean. It also has organisms that crawl or stick to the ground. | B | 381 | |
Identify the question that Judy's experiment can best answer. | [
"Do the temperatures inside boxes depend on the sizes of the boxes?",
"Do the insides of white boxes get hotter than the insides of black boxes when the boxes are left in the sun?",
"All of the above",
"None of the above",
"I don't know"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Judy glued lids onto 16 cardboard shoe boxes of equal size. She painted eight of the boxes black and eight of the boxes white. Judy made a small hole in the side of each box and then stuck a thermometer partially into e... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | B | 382 | ||
What is the capital of Arizona? | [
"Tucson",
"Santa Fe",
"Phoenix",
"Carson City",
"I don't know"
] | 2 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Phoenix is the capital of Arizona. | C | 383 | |||
Identify the question that Sandra's experiment can best answer. | [
"Do slugs eat more from tomato leaves or broccoli leaves?",
"Do slugs weigh more after eating tomato leaves or broccoli leaves?",
"All of the above",
"None of the above",
"I don't know"
] | 0 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Sandra cut tomato and broccoli plant leaves into one-inch squares. In each of 12 containers, she placed six leaf squares: three tomato-leaf squares and three broccoli-leaf squares. She put one slug from her garden into ... | closed choice | grade8 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | A | 384 | ||
What is the capital of Indiana? | [
"Montgomery",
"Indianapolis",
"Fort Wayne",
"Atlanta",
"I don't know"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Midwest | Indianapolis is the capital of Indiana. | B | 385 | |||
Which i in column 1? | [
"the grocery store",
"the fire department",
"the school",
"the police department",
"I don't know"
] | 0 | closed choice | grade3 | social science | geography | Geography | Use a letter-number grid | A grid is made up of lines of squares. They are organized in rows and columns. A grid can help you use a map.
A row is a line of squares that goes from side to side. Rows are marked with letters.
A column is a line of squares that goes up and down. Columns are marked with numbers. | The grocery store is in column 1. | A | 386 | ||
In this experiment, which were part of a control group? | [
"the plants watered with tap water",
"the plants watered with greywater",
"All of the above",
"None of the above",
"I don't know"
] | 0 | The passage below describes an experiment.
Patty wanted to find ways to save water. She learned that people can reuse greywater, which is water that has been used in sinks, tubs, and washing machines. She wondered if her plants would be less healthy if she watered them with greywater instead of tap water.
Patty placed... | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify control and experimental groups | Experiments have variables, or parts that change. You can design an experiment to investigate whether changing a variable between different groups has a specific outcome.
For example, imagine you want to find out whether adding fertilizer to soil affects the height of pea plants. You could investigate this question wit... | In this experiment, Patty investigated whether watering plants with greywater affects the health of the plants. The plants watered with tap water did not get greywater. So, they were part of a control group. | A | 387 | |
Which country is highlighted? | [
"Vanuatu",
"the Marshall Islands",
"Kiribati",
"Nauru",
"I don't know"
] | 3 | closed choice | grade7 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Nauru. | D | 388 | |||
What is the expected ratio of offspring that do not have horns to offspring that have horns? Choose the most likely ratio. | [
"0:4",
"3:1",
"4:0",
"1:3",
"2:2"
] | 2 | In a group of cows, some individuals have horns and others do not. In this group, the gene for the horns trait has two alleles. The allele for not having horns (H) is dominant over the allele for having horns (h).
This Punnett square shows a cross between two cows. | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate ratios of offspring types | Offspring phenotypes: dominant or recessive?
How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to a... | To determine how many boxes in the Punnett square represent offspring that do or do not have horns, consider whether each phenotype is the dominant or recessive allele's version of the horns trait. The question tells you that the H allele, which is for not having horns, is dominant over the h allele, which is for havin... | C | 389 | |
Which of the following statements is true? | [
"Atoms can be seen with the naked eye.",
"Atoms make up every substance around you.",
"Atoms do not have mass.",
"None of the above",
"I don't know"
] | 1 | Though they are too small to see without a special microscope, atoms make up all of the substances around you.
Like all matter, atoms have mass and volume. But atoms are extremely small. A water droplet, like the one hanging from the tip of the leaf in this picture, contains more than a billion trillion atoms! | closed choice | grade7 | natural science | chemistry | Atoms and molecules | What are atoms and chemical elements? | B | 390 | |||
Which of the following fossils is younger? Select the more likely answer. | [
"mammal tooth",
"ginkgo leaf",
"All of the above",
"None of the above",
"I don't know"
] | 1 | This diagram shows fossils in an undisturbed sedimentary rock sequence. | closed choice | grade8 | natural science | earth-science | Fossils | Compare ages of fossils in a rock sequence | A fossil is the preserved evidence of an ancient organism. Some fossils are formed from body parts such as bones or shells. Other fossils, such as footprints or burrows, are formed from traces of an organism's activities.
Fossils are typically found in sedimentary rocks. Sedimentary rocks usually form in layers. Over t... | Look again at the fossils in the rock sequence diagram.
Compare the positions of these fossils to determine which one is younger:
The ginkgo leaf fossil is in a shallower layer in the rock sequence than the mammal tooth fossil. So, the ginkgo leaf fossil is most likely younger than the mammal tooth fossil. | B | 391 | |
Is the air inside a soap bubble a solid, a liquid, or a gas? | [
"a gas",
"a liquid",
"a solid",
"None of the above",
"I don't know"
] | 0 | closed choice | grade4 | natural science | physics | States of matter | Identify and sort solids, liquids, and gases | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a... | The air inside a soap bubble is a gas. A gas expands to fill a space.
The air inside a soap bubble fills all the space in the bubble. If the bubble pops, the air will expand to fill a much larger space. | A | 392 | ||
What can a fertilized egg grow into? | [
"a mature fern",
"a heart-shaped plant",
"All of the above",
"None of the above",
"I don't know"
] | 0 | This diagram shows the life cycle of a fern. | closed choice | grade7 | natural science | biology | Plant reproduction | Moss and fern life cycles | Fern plants reproduce using both asexual reproduction and sexual reproduction.
Mature ferns have flat leaves called fronds. Ferns have structures that look like small dots on the underside of their fronds. These structures are called spore cases. The mature ferns use asexual reproduction to make spores. When the spore ... | A fertilized egg can grow into a mature fern.
A heart-shaped plant grows from a spore, not from a fertilized egg. | A | 393 | |
What can Justine and Bridgette trade to each get what they want? | [
"Justine can trade her tomatoes for Bridgette's carrots.",
"Justine can trade her tomatoes for Bridgette's broccoli.",
"Bridgette can trade her almonds for Justine's tomatoes.",
"Bridgette can trade her broccoli for Justine's oranges.",
"I don't know"
] | 1 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Justine and Bridgette open their lunch boxes in the school cafeteria. Neither Justine nor Bridgette got everything that they want... | closed choice | grade8 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Justine wants broccoli. Bridgette wants tomatoes. They can trade tomatoes for broccoli to both get what they want. Trading other things would not help both people get more items they want. | B | 394 | ||
Which of these states is farthest south? | [
"Florida",
"South Carolina",
"Maine",
"Oregon",
"I don't know"
] | 0 | closed choice | grade4 | social science | geography | Maps | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Florida is farthest south. | A | 395 | ||
Which animal's mouth is also adapted to get insects out of burrows? | [
"tamandua",
"kudu",
"All of the above",
"None of the above",
"I don't know"
] | 0 | Giant anteaters eat insects such as ants and termites. These insects often live in holes called burrows. The anteater's mouth is adapted to get insects out of burrows.
Figure: giant anteater. | closed choice | grade4 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear ... | Look at the picture of the giant anteater.
A tube-shaped snout helps the giant anteater reach into a burrow. A long, sticky tongue helps it catch the insects.
Now look at each animal. Figure out which animal has a similar adaptation.
The tamandua has a tube-shaped snout and a long, sticky tongue. Its mouth is adapted t... | A | 396 | |
What is the direction of this push? | [
"away from the basketball player's hand",
"toward the basketball player's hand",
"All of the above",
"None of the above",
"I don't know"
] | 0 | A basketball player takes a shot. His hand pushes the ball into the air to score a basket. | closed choice | grade2 | natural science | physics | Force and motion | Identify pushes and pulls | One object can make another object move with a push or a pull.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The basketball player's shot is a type of push. He shoots the ball away from his hand to score a basket. The direction of the push is away from the basketball player's hand. | A | 397 | |
Select the organism in the same genus as the silver gull. | [
"Larus occidentalis",
"Chroicocephalus ridibundus",
"Caprimulgus europaeus",
"None of the above",
"I don't know"
] | 1 | This organism is a silver gull. Its scientific name is Chroicocephalus novaehollandiae. | closed choice | grade6 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A silver gull's scientific name is Chroicocephalus novaehollandiae. The first word of its scientific name is Chroicocephalus.
Larus occidentalis is in the genus Larus. The first word of its scientific name is Larus. So, Larus occidentalis and Chroicocephalus novaehollandiae are not in the same genus.
Caprimulgus europa... | B | 398 | |
In this food chain, the brown trout is a consumer. Why? | [
"It eats another organism.",
"It makes its own food.",
"All of the above",
"None of the above",
"I don't know"
] | 0 | This diagram shows a food chain from the River Frome, a freshwater ecosystem in England. | closed choice | grade4 | natural science | biology | Ecosystems | Identify roles in food chains | Every organism needs food to stay alive. Organisms get their food in different ways. A food chain shows how organisms in an ecosystem get their food.
Producers make their own food. Many producers use carbon dioxide, water, and sunlight to make sugar. This sugar is food for the producer.
Consumers eat other organisms. C... | In this food chain, the brown trout is a consumer because it eats another organism. The brown trout in this food chain eats the midge larva. | A | 399 |
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