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train/900 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is weaker in Pair 1.",
"The magnetic force is weaker in Pair 2.",
"The strength of the magnetic force is the same in both pairs."
] | 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. | 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. | 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. |
train/901 | What is the capital of Nebraska? | [
"Kansas City",
"Bismarck",
"Lincoln",
"Omaha"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Midwest | Lincoln is the capital of Nebraska. | ||
train/902 | What is the capital of Arkansas? | [
"Fayetteville",
"Bismarck",
"Richmond",
"Little Rock"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Southeast | Little Rock is the capital of Arkansas. | ||
train/903 | Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 0 | Figure: Oklahoma.
Large thunderstorms, called supercells, often bring big clouds. This cloud was seen over the plains of Oklahoma last summer.
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.
Large thunderstorms, called supercells, often bring big clouds. This cloud was seen over the plains of Oklahoma last summer.
The underlined part of the passage tells you about the clouds seen at a certain time in Oklahoma. This passage describes the atmosphere at a certain place and time. So... |
train/904 | Which material is this plate made of? | [
"wood",
"ceramic"
] | 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 plate.
The plate is ceramic.
Ceramics are made of clay. The clay is baked in an oven to make it hard. This oven is called a kiln. | |
train/905 | Which of the following could Mitchell's test show? | [
"the amount of sunlight the roof would get throughout the year",
"how many solar panels could fit on each side of the roof",
"which side of the roof got more sun over one day"
] | 2 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the ques... | closed choice | grade7 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a... | |
train/906 | Which air temperature was measured within the outlined area shown? | [
"5°C",
"27°C",
"14°C"
] | 1 | The map below shows air temperatures in the lower atmosphere on October 1, 2015. The outlined area shows an air mass that influenced weather in North America on that day.
Look at the map. Then, answer the question below.
Data source: United States National Oceanic and Atmospheric Administration/Earth System Research La... | closed choice | grade6 | natural science | earth-science | Weather and climate | Identify and compare air masses | To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show air temperatures.
The map's legend tells you the temperature that each color represents. Colors on the left in the legend represent lower temperatures than colors on the right. For ... | Look at the colors shown within the outlined area. Then, use the legend to determine which air temperatures those colors represent.
The legend tells you that this air mass contained air with temperatures between 25°C and 35°C.
27°C is within this range.
5°C and 14°C are outside of this range. |
train/907 | Which solution has a higher concentration of yellow particles? | [
"neither; their concentrations are the same",
"Solution B",
"Solution A"
] | 2 | 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... |
train/908 | 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 greater in Pair 2.",
"The magnitude of the magnetic force is greater in Pair 1.",
"The magnitude of the magnetic force is the same in both pairs."
] | 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. | 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,... | Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same.
So, the magnitude of the magnetic force is the same in both pairs. |
train/909 | Select the fish below. | [
"American bullfrog",
"whale shark",
"sea turtle",
"yak"
] | 1 | Fish live underwater. They have fins, not limbs.
Fish are cold-blooded. The body temperature of cold-blooded animals depends on their environment.
A clownfish is an example of a fish. | 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. | An American bullfrog is an amphibian. It has moist skin and begins its life in water.
Frogs live near water or in damp places. Most frogs lay their eggs in water.
A yak is a mammal. It has hair and feeds its young milk.
Yaks live in cold places. Their long hair helps keep them warm.
A sea turtle is a reptile. It has sc... |
train/910 | Identify the question that the students' experiment can best answer. | [
"Does the mixture of solutions release more gas when they are mixed at 25°C compared to 50°C?",
"Does the mixture's color change faster when the solutions are mixed at 25°C or 50°C?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Ten groups of chemistry students combined three solutions that, when mixed, chemically reacted and turned blue. Before mixing, five groups of students heated the solutions to 25°C, and five other groups heated the solut... | closed choice | grade7 | 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... | |
train/911 | Which solution has a higher concentration of purple particles? | [
"Solution B",
"Solution A",
"neither; their concentrations are the same"
] | 0 | The diagram below is a model of two solutions. Each purple ball represents one particle of solute. | closed choice | grade7 | 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 purple particles represent the solute. To figure out which solution has a higher concentration of purple particles, look at both the number of purple particles and the volume of the solvent in each container.
Use the concentration formula to find the number of purple particles per mill... |
train/912 | Which of the following could Julia and Tiana's test show? | [
"if the concrete from each batch took the same amount of time to dry",
"if a new batch of concrete was firm enough to use"
] | 1 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the ques... | closed choice | grade6 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a... | |
train/913 | Which animal is also adapted to be camouflaged among green leaves? | [
"huntsman spider",
"blue poison dart frog"
] | 0 | Leaf insects live in the forests of Asia and Australia. The is adapted to be camouflaged among green leaves.
Figure: leaf insect. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the leaf insect.
The leaf insect has a green leaf-shaped body. It is adapted to be camouflaged among green leaves. The word camouflage means to blend in.
Now look at each animal. Figure out which animal has a similar adaptation.
This huntsman spider has a green body. It is adapted to be camouflag... |
train/914 | 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."
] | 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 | 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.
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. |
train/915 | Complete the statement.
Copper is (). | [
"a compound",
"an elementary substance"
] | 1 | The model below represents copper. Copper is a metal that is used in electrical wires and in coins. | closed choice | grade8 | 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 copper is an elementary substance or a compound.
Step 1: Interpret the model.
In the space-filling model shown above, all of the balls are the same color:
. The legend shows that orange represents the chemical element with the atomic symbol Cu. So, the model shows you that copper is c... |
train/916 | What is the capital of Nevada? | [
"Detroit",
"Olympia",
"Reno",
"Carson City"
] | 3 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Carson City is the capital of Nevada. | ||
train/917 | Which property do these three objects have in common? | [
"sweet",
"sour",
"stretchy"
] | 2 | 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.
Sugar has a sweet taste. The bubble gum is sweet, but the balloon is not.
A stretchy object gets longer when you pull on it. All three objects are stretchy.
A lemon has a sour taste. The balloon is not sour.
The property that all three objects have i... |
train/918 | Which i in row B? | [
"the pond",
"the gas station",
"the grocery store",
"the school"
] | 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 pond is in row B. | |
train/919 | Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 1 | Two magnets are placed as shown. | closed choice | grade4 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles: north and south.
Here are some examples of magnets. The no... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The south pole of one magnet is closest to the south pole of the other magnet. Like poles repel. So, these magnets will repel each other. |
train/920 | Which country is highlighted? | [
"Nauru",
"the Marshall Islands",
"Vanuatu",
"Kiribati"
] | 0 | closed choice | grade6 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Nauru. | ||
train/921 | Which of the following statements describess living in an independent city-state? | [
"I vote for a president that rules over many different cities.",
"All the decisions about my city are made by a faraway emperor.",
"My city rules itself and is not part of a larger country.",
"I live by myself in the wilderness."
] | 2 | Athens was one of the most powerful independent city-states in ancient Greece. Look at the definitions below. Then answer the question. | closed choice | grade6 | social science | world-history | Greece | Classical Athens: geography and society | Look at the definitions.
Putting the definitions together, an independent city-state is a self-ruling city with its own government. So, a city-state rules itself and is not part of a larger country.
The ancient Greeks called a city-state a polis, which was the ancient Greek word for city. Today, the root word "polis" i... | |
train/922 | Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 0 | Figure: Angkor Wat.
Angkor Wat is an ancient city located in Cambodia. A light breeze was rustling the leaves in the trees there this morning.
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.
Angkor Wat is an ancient city located in Cambodia. A light breeze was rustling the leaves in the trees there this morning.
The underlined part of the passage tells you about the wind in Angkor Wat this morning. This passage describes the atmosphere at a certain place and time. So, this passa... |
train/923 | Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 1 | Two magnets are placed as shown. | closed choice | grade5 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces.
Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The north pole of one magnet is closest to the south pole of the other magnet. Opposite poles attract. So, these magnets will attract each other. |
train/924 | Which country is highlighted? | [
"Trinidad and Tobago",
"Grenada",
"Saint Kitts and Nevis",
"Saint Vincent and the Grenadines"
] | 0 | closed choice | grade6 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Trinidad and Tobago. | ||
train/925 | What is the capital of Idaho? | [
"New Haven",
"Boise",
"Nampa",
"Helena"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify the 50 state capitals | Boise is the capital of Idaho. | ||
train/926 | 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"
] | 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 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 ... |
train/927 | Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 1 | Figure: Mount Kilimanjaro.
Few climbers attempt to scale Mount Kilimanjaro during March, April, and May. These months often bring low pressure and cloudy, wet conditions each year.
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.
Few climbers attempt to scale Mount Kilimanjaro during March, April, and May. These months often bring low pressure and cloudy, wet conditions each year.
The underlined part of the passage tells you about the usual pattern of barometric pressure on Mount Kilimanjaro. This passage does not de... |
train/928 | What is the capital of North Carolina? | [
"Raleigh",
"Charlotte",
"Manchester",
"Little Rock"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Southeast | Raleigh is the capital of North Carolina. | ||
train/929 | Which of the following was a dependent variable in this experiment? | [
"the number of unwanted grasses",
"the number of times the plots were burned each year"
] | 0 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Dr. Gilbert was the land manager for a prairie that had become overrun by unwanted grasses. These grasses crowded out other plants. Dr. Gilbert thought that she could use fire to remove the unwanted grasses an... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify independent and dependent variables | Experiments have variables, or parts that change. You can design an experiment to find out how one variable affects another variable. For example, imagine that you want to find out if fertilizer affects the number of tomatoes a tomato plant grows. To answer this question, you decide to set up two equal groups of tomato... | |
train/930 | Which property matches this object? | [
"blue",
"sticky"
] | 0 | 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.
A sticky object can stick to other things. The binder is not sticky.
Blue is a color.
This color is blue. The binder is blue. |
train/931 | What is the name of the colony shown? | [
"Maryland",
"Indiana",
"Georgia",
"Virginia"
] | 2 | closed choice | grade7 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Georgia. | ||
train/932 | Which solution has a higher concentration of green particles? | [
"Solution B",
"Solution A",
"neither; their concentrations are the same"
] | 0 | The diagram below is a model of two solutions. Each green ball represents one particle of solute. | closed choice | grade8 | 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 green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container.
Use the concentration formula to find the number of green particles per millilit... |
train/933 | Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 1 | Figure: Tambor Beach, Costa Rica.
Tambor Beach is located in Costa Rica, a country in Central America. The temperature in Costa Rica is warm for most of the year.
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 | grade3 | 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.
Tambor Beach is located in Costa Rica, a country in Central America. The temperature in Costa Rica is warm for most of the year.
The underlined part of the passage tells you about the usual temperature pattern in Costa Rica. This passage does not describe what the weather is like on a partic... |
train/934 | What is the capital of Delaware? | [
"Dover",
"Montgomery",
"Georgetown",
"Wilmington"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Dover is the capital of Delaware. | ||
train/935 | Select the reptile below. | [
"western rattlesnake",
"western toad"
] | 0 | Reptiles have scaly, waterproof skin. Most reptiles live on land. A box turtle is an example of a reptile. | 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 western toad is an amphibian. It has moist skin and begins its life in water.
A western rattlesnake is a reptile. It has scaly, waterproof skin. |
train/936 | Which country is highlighted? | [
"Trinidad and Tobago",
"Antigua and Barbuda",
"Grenada",
"Haiti"
] | 0 | closed choice | grade6 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Trinidad and Tobago. | ||
train/937 | In this food web, which organism contains matter that eventually moves to the earthworm? | [
"mushroom",
"barren-ground caribou",
"snowy owl",
"grizzly bear"
] | 2 | Below is a food web from a tundra ecosystem in Nunavut, a territory in Northern Canada.
A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem. | closed choice | grade7 | natural science | biology | Ecological interactions | Interpret food webs II | A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web sho... | Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows to the earthworm.
The only arrow pointing from the grizzly bear leads to the mushroom. No arrows point from the mushroom to any other organisms. So, in this food web, matter does not move from the grizz... |
train/938 | Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 1 | Two magnets are placed as shown. | closed choice | grade5 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces.
Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The north pole of one magnet is closest to the north pole of the other magnet. Like poles repel. So, these magnets will repel each other. |
train/939 | What is the capital of Rhode Island? | [
"Cleveland",
"Providence",
"Harrisburg",
"Augusta"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Northeast | Providence is the capital of Rhode Island. | ||
train/940 | What can Miguel and Estelle trade to each get what they want? | [
"Miguel can trade his tomatoes for Estelle's broccoli.",
"Miguel can trade his tomatoes for Estelle's sandwich.",
"Estelle can trade her broccoli for Miguel's oranges.",
"Estelle can trade her almonds for Miguel's tomatoes."
] | 0 | 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.
Miguel and Estelle open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Miguel wante... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Miguel wanted broccoli in his lunch and Estelle was hoping for tomatoes. Look at the labeled part of the images.
Miguel has tomatoes. Estelle has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want. | |
train/941 | Which property do these four objects have in common? | [
"shiny",
"rough",
"flexible"
] | 0 | 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.
A flexible object can be folded or bent without breaking easily. The shield is not flexible.
A shiny object reflects a lot of light. You can usually see your reflection in a shiny object. All four objects are shiny.
A rough object feels scratchy when... |
train/942 | Which animal's skin is better adapted for protection against a predator with sharp teeth? | [
"fantastic leaf-tailed gecko",
"nine-banded armadillo"
] | 1 | Ground pangolins are adapted to defend their bodies against a predator with sharp teeth. They have hard scales covering much of their skin. When frightened, the can roll into a ball to protect the soft parts of its body.
Figure: ground pangolin. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the ground pangolin.
The ground pangolin has hard scales on its skin. Its skin is adapted for protection against a predator with sharp teeth. The scales make it difficult for predators to hurt or kill the ground pangolin.
Now look at each animal. Figure out which animal has a similar adaptation.
... |
train/943 | What can Grace and Ariana trade to each get what they want? | [
"Ariana can trade her almonds for Grace's tomatoes.",
"Grace can trade her tomatoes for Ariana's carrots.",
"Ariana can trade her broccoli for Grace's oranges.",
"Grace can trade her tomatoes for Ariana's broccoli."
] | 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.
Grace and Ariana open their lunch boxes in the school cafeteria. Neither Grace nor Ariana 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.
Grace wants broccoli. Ariana 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. | |
train/944 | What is the capital of Connecticut? | [
"New Haven",
"Hartford",
"Philadelphia",
"Montpelier"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Hartford is the capital of Connecticut. | ||
train/945 | Which rhetorical appeal is primarily used in this ad? | [
"ethos (character)",
"logos (reason)",
"pathos (emotion)"
] | 1 | closed choice | grade12 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals.
Appeals to ethos, or character, show the writer or speaker as trustworthy, authoritative, or sharing important values with the audience. An ad that appe... | The ad appeals to logos, or reason, by citing data that proves the face wash's effectiveness. | |
train/946 | What is the capital of Washington? | [
"Boston",
"Albany",
"Olympia",
"Spokane"
] | 2 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Olympia is the capital of Washington. | ||
train/947 | Based on the timeline, which of the following statements is true? | [
"Other civilizations existed at the same time as the Aztec.",
"The Aztec civilization lasted longer than the Maya civilization.",
"The Aztec were the only civilization to exist in the early Americas."
] | 0 | The Aztec were a people who created one of the most powerful civilizations in the early Americas. Historians call this civilization the Aztec Empire. Look at the timeline. Then answer the question below. | closed choice | grade6 | social science | world-history | Early Americas | Foundations of Aztec civilization | ||
train/948 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is weaker in Pair 2.",
"The magnetic force is weaker in Pair 1.",
"The strength of the magnetic force is the same in both pairs."
] | 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.
You c... | Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker.
The magnets in Pair 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1. |
train/949 | Which country is highlighted? | [
"Cuba",
"Haiti",
"the Dominican Republic",
"Jamaica"
] | 1 | closed choice | grade6 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Haiti.
Does Haiti have any territorial disputes?
Haiti claims to own Navassa Island, which is a disputed territory. In other words, multiple countries or groups claim that the area rightfully belongs to them.
Navassa Island is also claimed by the United States. The United States claimed the island in 18... | ||
train/950 | During this time, thermal energy was transferred from () to (). | [
"the surroundings . . . each refrigerator",
"each refrigerator . . . the surroundings"
] | 0 | Two identical refrigerators in a restaurant kitchen lost power. The door of one fridge was slightly open, and the door of the other fridge was closed. This table shows how the temperature of each refrigerator changed over 10minutes. | closed choice | grade7 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, th... | The temperature of each refrigerator increased, which means that the thermal energy of each refrigerator increased. So, thermal energy was transferred from the surroundings to each refrigerator. |
train/951 | 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 smaller in Pair 1.",
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is smaller in Pair 2."
] | 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 | grade8 | 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 greater distance between magnets, the magnitude of the magnetic force between them is smaller.
There is a greater distance between the magnets in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2. |
train/952 | Which country is highlighted? | [
"New Zealand",
"Samoa",
"Kiribati",
"Tonga"
] | 1 | closed choice | grade7 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Samoa. | ||
train/953 | Select the organism in the same genus as the great gray owl. | [
"Larus occidentalis",
"Cyanocitta stelleri",
"Strix varia"
] | 2 | This organism is a great gray owl. Its scientific name is Strix nebulosa. | 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 great gray owl's scientific name is Strix nebulosa. The first word of its scientific name is Strix.
Cyanocitta stelleri is in the genus Cyanocitta. The first word of its scientific name is Cyanocitta. So, Cyanocitta stelleri and Strix nebulosa are not in the same genus.
Larus occidentalis is in the genus Larus. The f... |
train/954 | What is the capital of Iowa? | [
"Cedar Rapids",
"Davenport",
"Springfield",
"Des Moines"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Midwest | Des Moines is the capital of Iowa. | ||
train/955 | Which term matches the picture? | [
"fibrous roots",
"taproot"
] | 1 | Read the text.
Plants have different kinds of roots. Some plants, like grasses, have a mass of small roots, called fibrous roots. These roots usually don't go very deep. Instead, they spread from side to side, which helps plants like grasses cover more space. Other plants, like many root vegetables, have taproots. A ta... | closed choice | grade6 | language science | vocabulary | Context clues | Determine the meaning of domain-specific words with pictures | A taproot is a large main root. Beets, like carrots and other root vegetables, have taproots. | |
train/956 | Which property do these three objects have in common? | [
"flexible",
"hard",
"fragile"
] | 0 | Select the best answer. | closed choice | grade3 | 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. | Look at each object.
For each object, decide if it has that property.
A hard object does not change shape when pressed or squeezed. The stuffed rabbit and the leisure suit are not hard.
A flexible object can be folded or bent without breaking easily. All three objects are flexible.
A fragile object will break into piec... |
train/957 | What is the capital of Arizona? | [
"Phoenix",
"Cheyenne",
"Oklahoma City",
"Tucson"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Phoenix is the capital of Arizona. | ||
train/958 | Which of these continents does the equator intersect? | [
"Africa",
"North America",
"Antarctica"
] | 0 | closed choice | grade5 | social science | geography | Maps | Use lines of latitude and longitude | Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latit... | The equator is the line at 0° latitude. It intersects Africa. It does not intersect North America or Antarctica. | |
train/959 | Is a bean a solid, a liquid, or a gas? | [
"a liquid",
"a solid",
"a gas"
] | 1 | closed choice | grade3 | 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 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 bean is a solid. A solid has a size and shape of its own.
If you put many beans into a jar, the group of beans will take the shape of the jar, as a liquid would. But be careful! A bean is not a liquid. Each bean still has a size and shape of its own. | |
train/960 | Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 0 | Two magnets are placed as shown.
Hint: Magnets that attract pull together. Magnets that repel push apart. | closed choice | grade2 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of magnets.... | Will these magnets attract or repel? To find out, look at which poles are closest to each other.
The south pole of one magnet is closest to the north pole of the other magnet. Poles that are different attract. So, these magnets will attract each other. |
train/961 | What is the capital of Hawaii? | [
"Hilo",
"Salt Lake City",
"Knoxville",
"Honolulu"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Honolulu is the capital of Hawaii. | ||
train/962 | During this time, thermal energy was transferred from () to (). | [
"the surroundings . . . each bottle",
"each bottle . . . the surroundings"
] | 0 | Two bottles of soda were sitting on a porch on a hot day. The two bottles were identical, except that one bottle was made of brown glass and one bottle was made of clear glass. This table shows how the temperature of each bottle changed over 25minutes. | closed choice | grade7 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, th... | The temperature of each bottle increased, which means that the thermal energy of each bottle increased. So, thermal energy was transferred from the surroundings to each bottle. |
train/963 | Which is the main persuasive appeal used in this ad? | [
"pathos (emotion)",
"ethos (character)",
"logos (reason)"
] | 1 | closed choice | grade7 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals:
Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one... | The ad appeals to ethos, or character. It includes a recommendation from someone famous or admired (actress). | |
train/964 | What is the capital of Florida? | [
"Nashville",
"Orlando",
"Tallahassee",
"Jefferson City"
] | 2 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Tallahassee is the capital of Florida. | ||
train/965 | Which type of relationship is formed when protists live in a termite's gut? | [
"mutualistic",
"parasitic",
"commensal"
] | 0 | Read the passage. Then answer the question.
Termites are small insects that eat wood. But they cannot completely digest the wood on their own. To help digest the wood, some termites rely on organisms called protists that live in their guts. These protists are microscopic, or too small to see without the aid of a micro... | closed choice | grade7 | natural science | biology | Ecological interactions | Classify symbiotic relationships | When two organisms of different species interact in a way that affects one or both organisms, they form a symbiotic relationship. The word symbiosis comes from a Greek word that means living together. Scientists define types of symbiotic relationships based on how each organism is affected.
This table lists three commo... | When protists live in a termite's gut, they get nutrients and energy from the wood the termite eats. So, the protists benefit from their relationship with the termite.
The termite is not able to use wood as food without the protists. So, the termite also benefits from its relationship with the protists.
Since both the ... |
train/966 | Which country is highlighted? | [
"Dominica",
"the Dominican Republic",
"Antigua and Barbuda",
"Haiti"
] | 0 | closed choice | grade8 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Dominica. | ||
train/967 | Is an ice cube a solid, a liquid, or a gas? | [
"a liquid",
"a solid",
"a gas"
] | 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... | An ice cube is a solid. Ice cubes can melt. But when an ice cube is frozen, it has a size and shape of its own. | |
train/968 | 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"
] | 1 | 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 | grade7 | 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, and the particles in both samples have the same average speed. So, the particles in both samples have the same average kinetic energy.
Because the particles in both samples have the same average kinetic energy, the samples must have the same temperature. |
train/969 | Is the following statement about our solar system true or false?
Earth is the largest planet that is made mainly of rock. | [
"false",
"true"
] | 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... | The table tells you that Mercury, Venus, Earth, and Mars are the planets made mainly of rock. Of these planets, Earth has the volume with the largest exponent. So, Earth is the largest planet that is made mainly of rock. |
train/970 | Which solution has a higher concentration of blue particles? | [
"Solution B",
"Solution A",
"neither; their concentrations are the same"
] | 1 | The diagram below is a model of two solutions. Each blue 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 blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container.
Use the concentration formula to find the number of blue particles per milliliter.
... |
train/971 | Select the organism in the same genus as the Canada lynx. | [
"Lynx canadensis",
"Dendrobates leucomelas",
"Castor canadensis"
] | 0 | This organism is a Canada lynx. Its scientific name is Lynx canadensis. | 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 Canada lynx's scientific name is Lynx canadensis. The first word of its scientific name is Lynx.
Castor canadensis and Lynx canadensis are not in the same genus.
These organisms are not in the same genus, but part of their scientific names is the same. Castor canadensis and Lynx canadensis have the same species name ... |
train/972 | Complete the sentence.
The Alpine Fault formed at a () boundary. | [
"convergent",
"transform",
"divergent"
] | 1 | Read the passage and look at the picture.
The Alpine Fault runs the length of New Zealand’s South Island, marking a boundary between the Pacific Plate and the Indo-Australian Plate. As the two plates slide past each other, the Pacific Plate is being pushed up higher than the Indo-Australian Plate. So, the mountains abo... | 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 convergent boundary, two plates are moving toward each other.
At a diverge... | To figure out what type of plate boundary formed the Alpine Fault, you need to know how the tectonic plates interacted. To find this out, read the passage carefully.
The Alpine Fault runs the length of New Zealand’s South Island, marking a boundary between the Pacific Plate and the Indo-Australian Plate. As the two pla... |
train/973 | Which material is this basketball jersey made of? | [
"polyester",
"porcelain"
] | 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 basketball jersey.
The basketball jersey is made of polyester.
Polyester is a strong and light synthetic fabric. Synthetic materials are created by people. Polyester can be woven into materials to make clothes or even seat belts! It can also be used as stuffing in pillows and furniture. | |
train/974 | What is the probability that a fruit fly produced by this cross will be homozygous dominant for the eye color gene? | [
"2/4",
"0/4",
"4/4",
"1/4",
"3/4"
] | 0 | In a group of fruit flies, some individuals have red eyes and others have brown eyes. In this group, the gene for the eye color trait has two alleles. The allele for red eyes (E) is dominant over the allele for brown eyes (e).
This Punnett square shows a cross between two fruit flies. | 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... | |
train/975 | Which animal's feet are also adapted for sticking to smooth surfaces? | [
"monitor lizard",
"Costa Rica brook frog"
] | 1 | House geckos are found in most warm places around the world. Many s live inside people's houses. They are good at climbing walls and ceilings. The feet of the are adapted for sticking to smooth surfaces.
Figure: house gecko. | 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 house gecko.
The house gecko has wide, sticky toes. Its feet are adapted for sticking to smooth surfaces. The house gecko uses its toes to walk on the smooth surfaces of leaves without slipping.
Now look at each animal. Figure out which animal has a similar adaptation.
The Costa Rica brook fr... |
train/976 | Which statement describes the Tibetan Plateau ecosystem? | [
"It has dry, thin soil that is rich in nutrients.",
"It has many evergreen trees.",
"It has mostly small plants."
] | 2 | Figure: Tibetan Plateau.
The Tibetan Plateau is a tundra ecosystem located in Tibet, western China, and northern India. The plateau is over 14,800 feet high and is surrounded by many mountain ranges. | closed choice | grade5 | 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 tundra is a type of ecosystem. Tundras have the following features: long, cold winters and short, cold summers, soil that is frozen year-round, and mostly small plants. So, the following statement describes the Tibetan Plateau ecosystem: long, cold winters and short, cold summers, soil that is frozen year-round, and ... |
train/977 | Select the organism in the same genus as the pink-backed pelican. | [
"Bubo scandiacus",
"Pelecanus rufescens",
"Falco sparverius"
] | 1 | This organism is a pink-backed pelican. Its scientific name is Pelecanus rufescens. | 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 pink-backed pelican's scientific name is Pelecanus rufescens. The first word of its scientific name is Pelecanus.
Falco sparverius is in the genus Falco. The first word of its scientific name is Falco. So, Falco sparverius and Pelecanus rufescens are not in the same genus.
This organism and the pink-backed pelican ar... |
train/978 | Which property do these three objects have in common? | [
"colorful",
"stretchy",
"transparent"
] | 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. The candy sprinkles and the parachute are not transparent.
A colorful object has one or more bright colors. All three objects are colorful.
A stretchy object gets longer when you pull on it. The socks... |
train/979 | What is the name of the colony shown? | [
"Maine",
"Rhode Island",
"Connecticut",
"Florida"
] | 2 | closed choice | grade4 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is Connecticut. | ||
train/980 | What is the capital of North Dakota? | [
"Topeka",
"Bismarck",
"Fargo",
"Springfield"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Midwest | Bismarck is the capital of North Dakota. | ||
train/981 | What is the capital of Rhode Island? | [
"Providence",
"Milwaukee",
"Raleigh",
"Boston"
] | 0 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Northeast | Providence is the capital of Rhode Island. | ||
train/982 | What is the capital of North Carolina? | [
"Charlotte",
"Raleigh",
"Frankfort",
"Jefferson City"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Southeast | Raleigh is the capital of North Carolina. | ||
train/983 | Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 1 | Two magnets are placed as shown. | closed choice | grade5 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces.
Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The south pole of one magnet is closest to the north pole of the other magnet. Opposite poles attract. So, these magnets will attract each other. |
train/984 | Which of the following was an independent variable in this experiment? | [
"the amount of lemon juice added to the apple slices",
"the number of apple slices that turned brown"
] | 0 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Carson's daughter complained that the in her lunchbox turned brown by lunchtime. Carson read that when are exposed to air, oxygen in the air reacts with the cut surface of the , turning them brown. Carson's ... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify independent and dependent variables | Experiments have variables, or parts that change. You can design an experiment to find out how one variable affects another variable. For example, imagine that you want to find out if fertilizer affects the number of tomatoes a tomato plant grows. To answer this question, you decide to set up two equal groups of tomato... | |
train/985 | Which is this organism's common name? | [
"North American beaver",
"Castor canadensis"
] | 0 | This organism is a North American beaver. It is also called Castor canadensis. | closed choice | grade7 | natural science | biology | Classification and scientific names | Identify common and scientific names | An organism's common name is the name that people normally call the organism. Common names often contain words you know.
An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English.
Scientific names are written in italics,... | Castor canadensis is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name.
Castor canadensis is the organism's scientific name. So, you know that North American beaver is the common name. |
train/986 | What can Malik and Annie trade to each get what they want? | [
"Malik can trade his tomatoes for Annie's broccoli.",
"Annie can trade her broccoli for Malik's oranges.",
"Annie can trade her almonds for Malik's tomatoes.",
"Malik can trade his tomatoes for Annie's carrots."
] | 0 | 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.
Malik and Annie open their lunch boxes in the school cafeteria. Neither Malik nor Annie got everything that they wanted. The tabl... | closed choice | grade7 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Malik wants broccoli. Annie 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. | |
train/987 | Which material is this fork made of? | [
"metal",
"porcelain"
] | 0 | closed choice | grade2 | 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 fork.
The fork is made of metal.
Forks can also be made of plastic. Some forks are even made from corn! | |
train/988 | What is the name of the colony shown? | [
"Massachusetts",
"South Carolina",
"Connecticut",
"Maine"
] | 2 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Connecticut. | ||
train/989 | Select the organism in the same genus as the European hedgehog. | [
"Erinaceus europaeus",
"Lepus europaeus",
"Alouatta caraya"
] | 0 | This organism is a European hedgehog. Its scientific name is Erinaceus europaeus. | 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 European hedgehog's scientific name is Erinaceus europaeus. The first word of its scientific name is Erinaceus.
Alouatta caraya is in the genus Alouatta. The first word of its scientific name is Alouatta. So, Alouatta caraya and Erinaceus europaeus are not in the same genus.
This organism and the European hedgehog ar... |
train/990 | Look at the models of molecules below. Select the elementary substance. | [
"bromomethane",
"acetaldehyde",
"chlorine"
] | 2 | closed choice | grade6 | natural science | chemistry | Atoms and molecules | Identify 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 ... | ||
train/991 | Which of these states is farthest north? | [
"South Carolina",
"Idaho",
"Florida",
"California"
] | 1 | 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. Idaho is farthest north. | |
train/992 | What is the capital of Arkansas? | [
"Fayetteville",
"Richmond",
"Cedar Rapids",
"Little Rock"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Little Rock is the capital of Arkansas. | ||
train/993 | What is the capital of Minnesota? | [
"Saint Paul",
"Fort Wayne",
"Indianapolis",
"Columbus"
] | 0 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Midwest | Saint Paul is the capital of Minnesota. | ||
train/994 | Which of the following organisms is the secondary consumer in this food web? | [
"phytoplankton",
"black rockfish",
"zooplankton",
"sea urchin"
] | 1 | Below is a food web from an ocean ecosystem in Monterey Bay, off the coast of California.
A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem. | closed choice | grade8 | natural science | biology | Ecological interactions | Interpret food webs I | A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web sho... | Secondary consumers eat primary consumers, and primary consumers eat producers. So, in a food web, secondary consumers have arrows pointing to them from primary consumers. Primary consumers have arrows pointing to them from producers.
The sea urchin has an arrow pointing to it from the kelp. The kelp is not a primary c... |
train/995 | What can Amanda and Leroy trade to each get what they want? | [
"Leroy can trade his broccoli for Amanda's oranges.",
"Amanda can trade her tomatoes for Leroy's broccoli.",
"Leroy can trade his almonds for Amanda's tomatoes.",
"Amanda can trade her tomatoes for Leroy's carrots."
] | 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.
Amanda and Leroy open their lunch boxes in the school cafeteria. Neither Amanda nor Leroy got everything that they wanted. The ta... | closed choice | grade8 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Amanda wants broccoli. Leroy 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. | |
train/996 | Which animal's skin is better adapted as a warning sign to ward off predators? | [
"Spanish shawl nudibranch",
"fantastic leaf-tailed gecko"
] | 0 | Sharpnose-puffers are poisonous animals with brightly colored skin. The bright color serves as a warning sign that the animal is poisonous. The 's skin is adapted to ward off predators.
Figure: sharpnose-puffer. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the sharpnose-puffer.
The sharpnose-puffer has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The bright colors serve as a warning sign that the sharpnose-puffer is poisonous.
Now look at each animal. Figure out which animal has a similar adaptation.
The S... |
train/997 | Which animal is also adapted to be camouflaged in a sandy desert? | [
"fennec fox",
"scarlet snake"
] | 0 | Bearded dragons are lizards that live in the deserts of Australia. The is adapted to be camouflaged in a sandy desert.
Figure: bearded dragon. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the bearded dragon.
The bearded dragon has a sand-colored body. It is adapted to be camouflaged in a sandy desert. The word camouflage means to blend in.
Now look at each animal. Figure out which animal has a similar adaptation.
The fennec fox has sand-colored fur covering its skin. It is adapted... |
train/998 | Which animal's limbs are also adapted for climbing trees? | [
"okapi",
"three-toed sloth"
] | 1 | s live in the rain forests of Indonesia and Malaysia. Their limbs are adapted for climbing trees.
Figure: Sumatran orangutan. | 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.
Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For examp... | Look at the picture of the Sumatran orangutan.
The Sumatran orangutan uses its long limbs to reach branches while climbing. It uses its fingers and toes to grab the branches.
Now look at each animal. Figure out which animal has a similar adaptation.
The three-toed sloth has long limbs with fingers and toes. Its limbs a... |
train/999 | Which solution has a higher concentration of blue particles? | [
"Solution B",
"neither; their concentrations are the same",
"Solution A"
] | 0 | The diagram below is a model of two solutions. Each blue ball represents one particle of solute. | closed choice | grade8 | 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 blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container.
Use the concentration formula to find the number of blue particles per milliliter.
... |
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