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Question: What is the volume of a large soup pot?
Options: (A) 7 liters (B) 7 milliliters
Hint: Select the better estimate.
Answer:A. The better estimate for the volume of a large soup pot is 7 liters.
7 milliliters is too little. |
Question: What information supports the conclusion that Logan inherited this trait?
Options: (A) Logan's mother has blue eyes. She passed this trait down to Logan. (B) Logan likes to wear a blue sweater to match his blue eyes.
Hint: Read the description of a trait.
Logan has blue eyes.
Answer:A. |
Question: Is the following trait inherited or acquired?
Katy plays soccer.
Options: (A) inherited (B) acquired
Hint: Hint: Playing soccer takes practice.
Answer:B. People are not born knowing how to play soccer. Instead, some people learn how to play soccer. Playing the sport takes practice. So, playing soccer is an acquired trait. |
Question: Based on this information, what is Holly's phenotype for the whisker type trait?
Options: (A) straight whiskers (B) curved whiskers
Hint: In a group of Syrian hamsters, some individuals have straight whiskers and others have curved whiskers. In this group, the gene for the whisker type trait has two alleles. The allele for curved whiskers (h) is recessive to the allele for straight whiskers (H).
Holly is a Syrian hamster from this group. Holly has the heterozygous genotype Hh for the whisker type gene.
Answer:A. You need to determine Holly's phenotype for the whisker type trait. First, consider the alleles in Holly's genotype for the whisker type gene. Then, decide whether these alleles are dominant or recessive.
The allele for curved whiskers (h) is recessive to the allele for straight whiskers (H). This means H is a dominant allele, and h is a recessive allele.
Holly's genotype of Hh has one dominant allele and one recessive allele. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Holly's phenotype for the whisker type trait must be straight whiskers. |
Question: What information supports the conclusion that Aaron acquired this trait?
Options: (A) Aaron is most interested in plant biology. (B) Aaron learned biology by doing experiments.
Hint: Read the description of a trait.
Aaron knows a lot about biology.
Answer:B. |
Question: How long is a guitar?
Options: (A) 1 centimeter (B) 1 meter (C) 1 kilometer (D) 1 millimeter
Hint: Select the best estimate.
Answer:B. The best estimate for the length of a guitar is 1 meter.
1 millimeter and 1 centimeter are too short. 1 kilometer is too long. |
Question: Which object has more thermal energy?
Options: (A) a cherry pie at a temperature of 90°F (B) a cherry pie at a temperature of 85°F
Hint: The objects are identical except for their temperatures.
Answer:A. The two cherry pies have the same mass but different temperatures. Since the 90°F pie is hotter than the 85°F pie, it has more thermal energy. |
Question: Is the following trait inherited or acquired?
Bobby has a scar on his left leg.
Options: (A) inherited (B) acquired
Hint: Hint: Most scars are caused by accidents during a person's life.
Answer:B. Children do not inherit their parent's scars. Instead, scars are caused by the environment. People can get scars after they get hurt. So, having a scar is an acquired trait. |
Question: Using only these supplies, which question can Jeremiah investigate with an experiment?
Options: (A) Is the pet lizard more active when its tank is heated with one heating lamp or with two heating lamps? (B) Is the pet lizard more active when it is fed insects or lettuce? (C) Is the pet lizard more active when it is fed crickets or mealworms?
Hint: Jeremiah has a pet lizard. Jeremiah notices that on some days, the lizard is active and runs around the tank. On other days, the lizard hardly moves at all. Jeremiah wonders what factors affect how active his lizard is. So, he decides to design an experiment. He has the following supplies available:
one pet lizard
live crickets
live mealworms
one heating lamp
Answer:C. |
Question: Based on this information, what is Bambi's genotype for the coat color gene?
Options: (A) a black coat (B) LL
Hint: In a group of cows, some individuals have a black coat and others have a red coat. In this group, the gene for the coat color trait has two alleles. The allele L is for a black coat, and the allele l is for a red coat.
Bambi, a cow from this group, has a black coat. Bambi has two alleles for a black coat.
Answer:B. An organism's genotype for a gene is its combination of alleles for that gene. Bambi has two alleles for a black coat (L). So, Bambi's genotype for the coat color gene is LL. |
Question: How long is a walk across Central Park in New York City?
Options: (A) 3 centimeters (B) 3 millimeters (C) 3 kilometers (D) 3 meters
Hint: Select the best estimate.
Answer:C. The best estimate for the length of a walk across Central Park in New York City is 3 kilometers.
3 millimeters, 3 centimeters, and 3 meters are all too short. |
Question: Based on this information, what is Squirt's phenotype for the tail spots trait?
Options: (A) a spotted tail (B) an unspotted tail
Hint: In a group of guppies, some individuals have a spotted tail and others have an unspotted tail. In this group, the gene for the tail spots trait has two alleles. The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i).
Squirt is a guppy from this group. Squirt has the heterozygous genotype Ii for the tail spots gene.
Answer:A. You need to determine Squirt's phenotype for the tail spots trait. First, consider the alleles in Squirt's genotype for the tail spots gene. Then, decide whether these alleles are dominant or recessive.
The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i). This means I is a dominant allele, and i is a recessive allele.
Squirt's genotype of Ii has one dominant allele and one recessive allele. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Squirt's phenotype for the tail spots trait must be a spotted tail. |
Question: Using only these supplies, which question can Stefan investigate with an experiment?
Options: (A) Does vegetable oil separate faster when stirred together with vinegar or with water? (B) Does vegetable oil separate faster when stirred together with cold water or with hot water? (C) Does vinegar separate faster when stirred together with olive oil or with coconut oil?
Hint: Stefan mixes oil and vinegar to make salad dressing. He notices that after a few minutes, the oil and vinegar separate. He wonders what factors affect how quickly liquids separate. So, he decides to design an experiment. He has the following supplies available:
three glass bottles
olive oil
vegetable oil
vinegar
cold water
Answer:A. |
Question: Assume all other forces on Tamir are balanced. Which statement describes the forces on Tamir?
Options: (A) The forces are balanced, so there is no net force on Tamir. (B) The forces are unbalanced, so there is a net force on Tamir.
Hint: Tamir is standing on a diving board at the pool. Earth's gravity is pulling down on Tamir with a force of 400N. The diving board is pushing up on Tamir with a force of 400N.
Answer:A. To determine if there is a net force on Tamir, look at the forces:
Earth's gravity is pulling Tamir down with a force of 400 N.
The diving board is pushing Tamir up with a force of 400 N.
The forces are in opposite directions, and the forces have the same magnitude: 400 N. This means that the forces are balanced, so there is no net force on Tamir. |
Question: Complete the sentence.
In this chemical reaction, glucose is a ().
Options: (A) reactant (B) product
Hint: This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.
Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe.
Answer:B. Read the underlined text carefully. Look for information about what happens to glucose in this chemical reaction.
Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe.
The underlined text tells you that glucose forms when water combines with carbon dioxide. Because glucose is produced by this chemical reaction, glucose is a product. |
Question: Complete the statement. Assume that the sled's mass did not change.
The gravitational potential energy stored between the sled and Earth () as Michelle rode down the hill.
Options: (A) stayed the same (B) decreased (C) increased
Hint: Read the text about an object in motion.
On a snowy day, Michelle rode her sled down a big hill.
Answer:B. Think about how the distance between the sled and the center of Earth changed.
The bottom of the hill was lower than the point where Michelle started sledding. As Michelle rode toward the bottom of the hill, the distance between the sled and the center of Earth decreased. So, the gravitational potential energy stored between the sled and Earth decreased as Michelle rode down the hill. |
Question: Based on this information, what is Zazu's phenotype for the cheek color trait?
Options: (A) pale orange cheeks (B) bright orange cheeks
Hint: In a group of cockatiels, some individuals have bright orange cheeks and others have pale orange cheeks. In this group, the gene for the cheek color trait has two alleles. The allele for pale orange cheeks (r) is recessive to the allele for bright orange cheeks (R).
Zazu is a cockatiel from this group. Zazu has the homozygous genotype RR for the cheek color gene.
Answer:B. Zazu's genotype for the cheek color gene is RR. Zazu's genotype of RR has only R allelles. The R allele is for bright orange cheeks. So, Zazu's phenotype for the cheek color trait must be bright orange cheeks.
To check this answer, consider whether Zazu's alleles are dominant or recessive. The allele for pale orange cheeks (r) is recessive to the allele for bright orange cheeks (R). This means R is a dominant allele, and r is a recessive allele.
Zazu's genotype of RR has two dominant alleles. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Zazu's phenotype for the cheek color trait must be bright orange cheeks. |
Question: Select the vertebrate.
Options: (A) redback spider (B) common octopus (C) birdwing butterfly (D) asp viper
Hint: Hint: Mammals, birds, fish, reptiles, and amphibians are vertebrates.
Answer:D. Like other octopuses, a common octopus is an invertebrate. It does not have a backbone. It has a soft body.
Like other spiders, a redback spider is an invertebrate. It does not have a backbone. It has an exoskeleton.
A birdwing butterfly is an insect. Like other insects, a birdwing butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
An asp viper is a reptile. Like other reptiles, an asp viper is a vertebrate. It has a backbone. |
Question: Which metal paper clip has less thermal energy?
Options: (A) the colder metal paper clip (B) the hotter metal paper clip
Hint: Two metal paper clips are identical except for their temperatures.
Answer:A. The two metal paper clips are made of the same material and have the same mass. So, the colder metal paper clip has less thermal energy. |
Question: What is the volume of a bowl of soup?
Options: (A) 11 cups (B) 11 gallons (C) 11 fluid ounces
Hint: Select the best estimate.
Answer:C. The best estimate for the volume of a bowl of soup is 11 fluid ounces.
11 cups and 11 gallons are both too much. |
Question: Ken starts to pull the wagon across the yard. To move the wagon at the same speed each time, which friend does Ken need to pull with a larger force?
Options: (A) a friend who weighs 32 pounds (B) a friend who weighs 25 pounds
Hint: Ken gives two friends a ride in his wagon. One friend sits in the wagon at a time.
Answer:A. Look for the friend who is heavier.
A friend who weighs 32 pounds is heavier than a friend who weighs 25 pounds. So, to move the wagon at the same speed each time, Ken needs to use a larger force to start moving the wagon with a friend who weighs 32 pounds. |
Question: Is the following trait inherited or acquired?
Elijah plays hockey.
Options: (A) inherited (B) acquired
Hint: Hint: Playing hockey takes practice.
Answer:B. People are not born knowing how to play hockey. Instead, some people learn how to play hockey. Playing the sport takes practice. So, playing hockey is an acquired trait. |
Question: Complete the sentence.
In this chemical reaction, carbon dioxide is a ().
Options: (A) product (B) reactant
Hint: This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.
Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe.
Answer:B. Read the underlined text carefully. Look for information about what happens to carbon dioxide in this chemical reaction.
Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe.
The underlined text tells you that when water and carbon dioxide combine, glucose and oxygen are formed. When water and carbon dioxide react, or go through a chemical change, their atoms are rearranged to form glucose and oxygen. Because carbon dioxide reacts in this chemical reaction, carbon dioxide is a reactant. |
Question: Is the following trait inherited or acquired?
Becky can fly an airplane.
Options: (A) acquired (B) inherited
Hint: Hint: Pilots have to learn how to fly an airplane.
Answer:A. People are not born knowing how to fly an airplane. Instead, some people learn how to fly airplanes. So, flying an airplane is an acquired trait. |
Question: How long is a sandbox?
Options: (A) 2 centimeters (B) 2 meters
Hint: Select the better estimate.
Answer:B. The better estimate for the length of a sandbox is 2 meters.
2 centimeters is too short. |
Question: What information supports the conclusion that Ryan acquired this trait?
Options: (A) Ryan learned how to build a fire at summer camp. (B) Ryan can cook food over a fire.
Hint: Read the description of a trait.
Ryan knows how to build a fire.
Answer:A. |
Question: What is the mass of an elephant?
Options: (A) 4,295 grams (B) 4,295 kilograms
Hint: Select the better estimate.
Answer:B. The better estimate for the mass of an elephant is 4,295 kilograms.
4,295 grams is too light. |
Question: How long is a pen?
Options: (A) 20 kilometers (B) 20 centimeters
Hint: Select the better estimate.
Answer:B. The better estimate for the length of a pen is 20 centimeters.
20 kilometers is too long. |
Question: What is the volume of a paper drinking cup?
Options: (A) 185 liters (B) 185 milliliters
Hint: Select the better estimate.
Answer:B. The better estimate for the volume of a paper drinking cup is 185 milliliters.
185 liters is too much. |
Question: What information supports the conclusion that Harry inherited this trait?
Options: (A) Harry's biological mother has long hair. Harry also has long hair. (B) Harry's biological parents have wavy hair. (C) Harry uses a headband to keep his wavy hair out of his face.
Hint: Read the description of a trait.
Harry has wavy hair.
Answer:B. |
Question: Which drop of dish soap has a lower temperature?
Options: (A) the drop of dish soap with more thermal energy (B) the drop of dish soap with less thermal energy
Hint: Two drops of dish soap are identical except for their thermal energies.
Answer:B. The two drops of dish soap are made of the same material and have the same mass. So, the drop of dish soap with less thermal energy has a lower temperature. |
Question: How long does it take to bake lasagna in the oven?
Options: (A) 42 hours (B) 42 minutes
Hint: Select the better estimate.
Answer:B. The better estimate for how long it takes to bake lasagna in the oven is 42 minutes.
42 hours is too slow. |
Question: Select the vertebrate.
Options: (A) ladybug (B) earthworm (C) mosquito (D) rainbow trout
Hint: Hint: Mammals, birds, fish, reptiles, and amphibians are vertebrates.
Answer:D. A mosquito is an insect. Like other insects, a mosquito is an invertebrate. It does not have a backbone. It has an exoskeleton.
A ladybug is an insect. Like other insects, a ladybug is an invertebrate. It does not have a backbone. It has an exoskeleton.
An earthworm is a worm. Like other worms, an earthworm is an invertebrate. It does not have a backbone. It has a soft body.
A rainbow trout is a fish. Like other fish, a rainbow trout is a vertebrate. It has a backbone. |
Question: Suppose Jennifer decides to make cream of mushroom soup. Which result would be a cost?
Options: (A) The cream of mushroom soup will be tastier than the onion soup would have been. (B) Jennifer will spend more time making the cream of mushroom soup than she would have spent making the onion soup.
Hint: Jennifer is deciding whether to make cream of mushroom soup or onion soup for dinner. She wants dinner to be as tasty as possible. But she is also hungry and wants to eat soon.
Answer:B. This result is a cost. It involves giving up or spending something that Jennifer wants or needs:
Jennifer will spend more time making the cream of mushroom soup than she would have spent making the onion soup. |
Question: Select the one animal that has all of the reptile traits listed above.
Options: (A) Cardinalfish have scaly skin and live near coral reefs. Cardinalfish lay eggs with no shells and have fins that help them swim underwater. (B) Galapagos giant tortoises hatch from eggs with shells and live on the Galapagos Islands in the Pacific Ocean. They can live to be over 150 years old! Galapagos giant tortoises have scaly, waterproof skin.
Hint: Reptiles are a group of animals with similar traits. The following traits can be used to identify reptiles:
They have scaly, waterproof skin.
They make eggs with shells. Observe the animals and read the descriptions.
Answer:B. To decide if an animal is part of a group, look at the traits of the group.
Reptiles have the following traits:
They have scaly, waterproof skin.
They make eggs with shells.
Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits.
A Galapagos giant tortoise has the following traits:
It has scaly, waterproof skin.
It makes eggs with shells.
A Galapagos giant tortoise has the traits of a reptile. A Galapagos giant tortoise is a reptile.
A cardinalfish has the following traits:
It has fins, not limbs.
It makes eggs with no shells.
A cardinalfish does not have all of the traits of a reptile. A cardinalfish is a fish. |
Question: What is the mass of a pair of boots?
Options: (A) 5 pounds (B) 5 tons (C) 5 ounces
Hint: Select the best estimate.
Answer:A. The best estimate for the mass of a pair of boots is 5 pounds.
5 ounces is too light and 5 tons is too heavy. |
Question: How long is a garden snail?
Options: (A) 50 millimeters (B) 50 kilometers (C) 50 centimeters (D) 50 meters
Hint: Select the best estimate.
Answer:A. The best estimate for the length of a garden snail is 50 millimeters.
50 centimeters, 50 meters, and 50 kilometers are all too long. |
Question: Select the animal that has a backbone.
Options: (A) harbor seal (B) curlyhair tarantula
Hint: Hint: Mammals, birds, fish, reptiles, and amphibians all have backbones.
Answer:A. A harbor seal is a mammal. Like other mammals, a harbor seal has a backbone.
Like other tarantulas, a curlyhair tarantula does not have a backbone. It has a hard outer cover. |
Question: Based on this information, what is this rose plant's phenotype for the flower color trait?
Options: (A) dark yellow flowers (B) ff
Hint: In a group of rose plants, some individuals have light yellow flowers and others have dark yellow flowers. In this group, the gene for the flower color trait has two alleles. The allele F is for light yellow flowers, and the allele f is for dark yellow flowers.
A certain rose plant from this group has dark yellow flowers. This plant has two alleles for dark yellow flowers.
Answer:A. An organism's phenotype for a trait is its observable version of that trait. The rose plant's observable version of the flower color trait is dark yellow flowers. So, the plant's phenotype for the flower color trait is dark yellow flowers. |
Question: Complete the statement.
Hydrogen chloride is ().
Options: (A) a compound (B) an elementary substance
Hint: Hydrogen chloride is part of the liquid in your stomach that helps digest food. The chemical formula for hydrogen chloride is HCl.
Answer:A. You can tell whether hydrogen chloride is an elementary substance or a compound by counting the number of atomic symbols in its chemical formula. An atomic symbol consists of either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for hydrogen chloride, HCl, contains two atomic symbols: H for hydrogen and Cl for chlorine. So, the formula tells you that hydrogen chloride is composed of two chemical elements bonded together.
Since hydrogen chloride is composed of multiple chemical elements bonded together, hydrogen chloride is a compound. |
Question: What is the mass of an ear of corn?
Options: (A) 16 ounces (B) 16 tons (C) 16 pounds
Hint: Select the best estimate.
Answer:A. The best estimate for the mass of an ear of corn is 16 ounces.
16 pounds and 16 tons are both too heavy. |
Question: Using only these supplies, which question can Logan investigate with an experiment?
Options: (A) Does a big toy car go down the wooden ramp faster than a small toy car? (B) Do toy cars go faster down the ramp made of wood or the ramp made of cardboard? (C) Do toy cars with plastic wheels go faster down the cardboard ramp than toy cars with metal wheels?
Hint: Logan and his sister are building ramps to race their toy cars down. Logan notices that the cars go down some of the ramps faster than others. He wonders what factors affect the cars' speed. So, he decides to design an experiment. He has the following supplies available:
two identical toy cars
a wooden ramp three feet long and two feet tall
a cardboard ramp three feet long and two feet tall
Answer:B. |
Question: Does this passage describe the weather or the climate?
Hanson enjoys the cool evening breezes that are common on summer evenings where he lives.
Options: (A) weather (B) climate
Hint: Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place.
Answer:B. Read the text carefully.
Hanson enjoys the cool evening breezes that are common on summer evenings where he lives.
This passage tells you about the usual wind patterns where Hanson lives. It does not describe what the weather is like on a particular day. So, this passage describes the climate. |
Question: Based on this information, what is Flash's phenotype for the horns trait?
Options: (A) HH (B) not having horns
Hint: 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 H is for not having horns, and the allele h is for having horns.
Flash, a cow from this group, does not have horns. Flash has two alleles for not having horns.
Answer:B. An organism's phenotype for a trait is its observable version of that trait. Flash's observable version of the horns trait is not having horns. So, Flash's phenotype for the horns trait is not having horns. |
Question: According to Newton's third law, what other force must be happening?
Options: (A) The Moon is pushing on Earth. (B) The Moon is pulling on Earth.
Hint: Isaac Newton was born in the 1600s and studied how objects move. He discovered three fundamental laws about forces and motion. According to Newton's third law, for every force, there is an equal and opposite force.
Consider the following force:
Earth is pulling on the Moon.
Answer:B. Earth is pulling on the Moon. So, Newton's third law tells you that the Moon is pulling on Earth. |
Question: What information supports the conclusion that Quincy acquired this trait?
Options: (A) Quincy's friend showed him how to ride a bicycle. (B) Quincy and his mother both ride bicycles. (C) Quincy rides his bicycle to school.
Hint: Read the description of a trait.
Quincy can ride a bicycle.
Answer:A. |
Question: Select the vertebrate.
Options: (A) woodpecker (B) castor bean tick (C) grasshopper (D) red-spotted purple butterfly
Hint: Hint: Mammals, birds, fish, reptiles, and amphibians are vertebrates.
Answer:A. A woodpecker is a bird. Like other birds, a woodpecker is a vertebrate. It has a backbone.
A grasshopper is an insect. Like other insects, a grasshopper is an invertebrate. It does not have a backbone. It has an exoskeleton.
A red-spotted purple butterfly is an insect. Like other insects, a red-spotted purple butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
A castor bean tick is an insect. Like other insects, a castor bean tick is an invertebrate. It does not have a backbone. It has an exoskeleton. |
Question: Suppose Isabelle decides to see the storks. Which result would be a cost?
Options: (A) Isabelle will enjoy seeing the storks more than she would have enjoyed seeing the cranes. (B) Isabelle will spend more time walking to the storks. They are on the other side of the zoo, but the cranes are close by.
Hint: Isabelle is deciding whether to see the storks or the cranes at the zoo. She wants to see lots of animals, but the zoo is closing soon.
Answer:B. This result is a cost. It involves giving up or spending something that Isabelle wants or needs:
Isabelle will spend more time walking to the storks. They are on the other side of the zoo, but the cranes are close by. |
Question: Complete the statement.
During this chemical reaction, the solution becomes ().
Options: (A) colder (B) warmer
Hint: When a chemical reaction absorbs or releases thermal energy, the reaction causes a change in temperature. Read the passage about a chemical reaction that absorbs or releases thermal energy. Then, follow the instructions below.
Pickling is used to prevent foods such as meat and vegetables from spoiling too soon. Food that has been pickled may remain edible for more than a year! One type of pickling involves soaking the food in a solution of water and sodium chloride (NaCl). When sodium chloride is dissolved in water, sodium ions (Na+) and chloride ions (Cl−) form in the solution. During this process, a small amount of thermal energy is taken in from the surroundings.
Answer:A. To determine whether the solution becomes warmer or colder, look for the text that describes the movement of thermal energy during the reaction.Pickling is used to prevent foods such as meat and vegetables from spoiling too soon. Food that has been pickled may remain edible for more than a year! One type of pickling involves soaking the food in a solution of water and sodium chloride (NaCl). When sodium chloride is dissolved in water, sodium ions (Na+) and chloride ions (Cl−) form in the solution. During this process, a small amount of thermal energy is taken in from the surroundings.The underlined text tells you that thermal energy is taken in from the surroundings. Because thermal energy moves out of the surroundings and into the reaction, the temperature of the surroundings decreases.The surroundings include the solution that the reaction takes place in. So, the solution becomes colder. |
Question: What is the volume of a blender?
Options: (A) 2 milliliters (B) 2 liters
Hint: Select the better estimate.
Answer:B. The better estimate for the volume of a blender is 2 liters.
2 milliliters is too little. |
Question: What information supports the conclusion that Sidney acquired this trait?
Options: (A) Sidney is most interested in American history. (B) Sidney learned history by reading.
Hint: Read the description of a trait.
Sidney knows a lot about history.
Answer:B. |
Question: How long is a hiking trail?
Options: (A) 6 centimeters (B) 6 kilometers
Hint: Select the better estimate.
Answer:B. The better estimate for the length of a hiking trail is 6 kilometers.
6 centimeters is too short. |
Question: What is the volume of a bowl of soup?
Options: (A) 8 gallons (B) 8 cups (C) 8 fluid ounces
Hint: Select the best estimate.
Answer:C. The best estimate for the volume of a bowl of soup is 8 fluid ounces.
8 cups and 8 gallons are both too much. |
Question: Based on the passage, what was the Protestant Reformation?
Options: (A) a war fought between Catholics in northern and western Europe (B) a movement demanding that the Catholic Church change some of its practices (C) a period when people asked Protestant churches to reform their teachings (D) a conflict between Protestants and people who separated from the Catholic Church
Hint: The Protestant Reformation, often called the Reformation, was an important period in European history. Read the following description of the Reformation. Then answer the question below.
Before the 1500s, most people in northern and western Europe followed a Christian religion called Roman Catholicism. The leader of the Roman Catholic Church was called the pope. Many people criticized the pope and the Catholic Church during the Reformation. Catholic leaders were asked to reform, or change, what they were teaching and how they led the Catholic community. Some of the people calling for reform decided to separate from the Catholic Church and became known as Protestants.
Answer:B. The Protestant Reformation was a movement demanding that the Catholic Church reform, or change, some of its practices. Catholic leaders were asked to reform, or change, what they were teaching and how they led the Catholic community. Choice "a period when people asked Protestant churches to reform their teachings" is incorrect. The Reformation was a period when people asked the Catholic Church to reform. Choice "a conflict between Protestants and people who separated from the Catholic Church" is incorrect. The people who left the Catholic Church were not in conflict with Protestants. They were Protestants. Choice "a war fought between Catholics in northern and western Europe" is incorrect. Before the Reformation, most people in northern and western Europe were Catholics, but they were not fighting with each other during this time. |
Question: Each bus takes the same amount of time to stop. Which school bus needs a larger force to come to a stop?
Options: (A) a school bus carrying 700 pounds (B) a school bus carrying 500 pounds
Hint: Kids from two different schools are riding their school buses home. The buses are the same. They are going the same speed. But different numbers of kids are riding in each bus.
Answer:A. Look for the school bus that is heavier.
A school bus carrying 700 pounds is heavier than a school bus carrying 500 pounds. So, the school bus carrying 700 pounds needs a larger force to come to a stop in the same amount of time as the other bus. |
Question: How long is a basketball court?
Options: (A) 27 meters (B) 27 millimeters (C) 27 centimeters (D) 27 kilometers
Hint: Select the best estimate.
Answer:A. The best estimate for the length of a basketball court is 27 meters.
27 millimeters and 27 centimeters are too short. 27 kilometers is too long. |
Question: Using only these supplies, which question can Steven investigate with an experiment?
Options: (A) Does a big toy car go down the wooden ramp faster than a small toy car? (B) Do toy cars go faster down the ramp made of wood or the ramp made of cardboard? (C) Do toy cars with plastic wheels go faster down the cardboard ramp than toy cars with metal wheels?
Hint: Steven and his sister are building ramps to race their toy cars down. Steven notices that the cars go down some of the ramps faster than others. He wonders what factors affect the cars' speed. So, he decides to design an experiment. He has the following supplies available:
two identical toy cars
a wooden ramp three feet long and two feet tall
a cardboard ramp three feet long and two feet tall
Answer:B. |
Question: According to Newton's third law, what other force must be happening?
Options: (A) The hockey puck is pulling on the hockey stick. (B) The hockey puck is pushing on the hockey stick.
Hint: Isaac Newton was born in the 1600s and studied how objects move. He discovered three fundamental laws about forces and motion. According to Newton's third law, for every force, there is an equal and opposite force.
Consider the following force:
A hockey stick is pushing on a hockey puck.
Answer:B. The hockey stick is pushing on the hockey puck. So, Newton's third law tells you that the hockey puck is pushing on the hockey stick. |
Question: Using only these supplies, which question can Martha investigate with an experiment?
Options: (A) Does the basketball bounce higher on gravel or on grass? (B) Do larger basketballs bounce higher than smaller basketballs on a brick patio? (C) Does the basketball bounce higher on a lawn or on a dirt path?
Hint: Martha gets a basketball for her birthday and dribbles it around her neighborhood. She notices that sometimes the ball bounces higher than other times. She wonders what factors affect how high her ball bounces. So, she decides to design an experiment. She has the following supplies available:
one basketball
access to a brick patio
access to a grassy lawn
access to a gravel driveway
a meterstick
Answer:A. |
Question: Select the animal that does not have a backbone.
Options: (A) toucan (B) castor bean tick
Hint: Hint: Insects, spiders, and worms do not have backbones.
Answer:B. A castor bean tick is an insect. Like other insects, a castor bean tick does not have a backbone. It has a hard outer cover.
A toucan is a bird. Like other birds, a toucan has a backbone. |
Question: Based on this information, what is Sugar's phenotype for the fur texture trait?
Options: (A) straight fur (B) wavy fur
Hint: In a group of Syrian hamsters, some individuals have straight fur and others have wavy fur. In this group, the gene for the fur texture trait has two alleles. The allele for wavy fur (f) is recessive to the allele for straight fur (F).
Sugar is a Syrian hamster from this group. Sugar has the homozygous genotype ff for the fur texture gene.
Answer:B. Sugar's genotype for the fur texture gene is ff. Sugar's genotype of ff has only f alleles. The f allele is for wavy fur. So, Sugar's phenotype for the fur texture trait must be wavy fur.
To check this answer, consider whether Sugar's alleles are dominant or recessive. The allele for wavy fur (f) is recessive to the allele for straight fur (F). This means F is a dominant allele, and f is a recessive allele.
Sugar's genotype of ff has only recessive alleles. An organism with only recessive alleles for a gene will have the recessive allele's version of the trait. So, Sugar's phenotype for the fur texture trait must be wavy fur. |
Question: What information supports the conclusion that Scott acquired this trait?
Options: (A) Scott learned how to build a fire at summer camp. (B) Scott can cook food over a fire.
Hint: Read the description of a trait.
Scott knows how to build a fire.
Answer:A. |
Question: What is the mass of a news magazine?
Options: (A) 9 tons (B) 9 pounds (C) 9 ounces
Hint: Select the best estimate.
Answer:C. The best estimate for the mass of a news magazine is 9 ounces.
9 pounds and 9 tons are both too heavy. |
Question: Which block of iron has more thermal energy?
Options: (A) the hotter block of iron (B) the colder block of iron
Hint: Two 1-kilogram blocks of iron are identical except for their temperatures.
Answer:A. The two blocks of iron are made of the same material and have the same mass. So, the hotter block of iron has more thermal energy. |
Question: Using only these supplies, which question can Dan investigate with an experiment?
Options: (A) Do toy cars go faster down the ramp made of wood or the ramp made of cardboard? (B) Do toy cars with plastic wheels go faster down the cardboard ramp than toy cars with metal wheels? (C) Does a big toy car go down the wooden ramp faster than a small toy car?
Hint: Dan and his sister are building ramps to race their toy cars down. Dan notices that the cars go down some of the ramps faster than others. He wonders what factors affect the cars' speed. So, he decides to design an experiment. He has the following supplies available:
two identical toy cars
a wooden ramp three feet long and two feet tall
a cardboard ramp three feet long and two feet tall
Answer:A. |
Question: Using only these supplies, which question can Bryan investigate with an experiment?
Options: (A) Which of the three types of tomato seeds sprouts the fastest? (B) Does a certain kind of tomato plant grow taller when planted in a clay pot or in a plastic pot? (C) Which type of soil will cause a certain kind of tomato plant to grow the most fruit?
Hint: Bryan and his classmates are growing tomato plants in the school garden. He wonders what factors affect how tomato plants grow. So, he decides to design an experiment. He has the following supplies available:
three different types of tomato seeds
one bag of potting soil
five identical clay pots
water
Answer:A. |
Question: Which pencil has a higher temperature?
Options: (A) the pencil with more thermal energy (B) the pencil with less thermal energy
Hint: Two pencils are identical except for their thermal energies.
Answer:A. The two pencils are made of the same material and have the same mass. So, the pencil with more thermal energy has a higher temperature. |
Question: What information supports the conclusion that Whitney acquired this trait?
Options: (A) Whitney learned how to build a fire at summer camp. (B) Whitney can cook food over a fire.
Hint: Read the description of a trait.
Whitney knows how to build a fire.
Answer:A. |
Question: Select the one animal that has all of the marsupial traits listed above.
Options: (A) Koalas have fluffy gray fur. Until a baby koala is about seven months old, its mother carries it in a pouch on the front of her body. (B) Galapagos giant tortoises hatch from eggs with shells and live on the Galapagos Islands in the Pacific Ocean. They can live to be over 150 years old! Galapagos giant tortoises have scaly, waterproof skin.
Hint: Marsupials are a group of animals with similar traits. The following traits can be used to identify marsupials:
They have offspring that lives in the mother's pouch after birth.
They have fur or hair. Observe the animals and read the descriptions.
Answer:A. To decide if an animal is part of a group, look at the traits of the group.
Marsupials have the following traits:
They have offspring that lives in the mother's pouch after birth.
They have fur or hair.
Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits.
A Galapagos giant tortoise has the following traits:
It has scaly, waterproof skin.
It makes eggs with shells.
A Galapagos giant tortoise does not have all of the traits of a marsupial. A Galapagos giant tortoise is a reptile.
A koala has the following traits:
It has offspring that lives in the mother's pouch after birth.
It has fur.
A koala has the traits of a marsupial. A koala is a marsupial. |
Question: Which object has the least thermal energy?
Options: (A) a 4-kilogram brick at a temperature of 281°F (B) a 4-kilogram brick at a temperature of 294°F (C) a 4-kilogram brick at a temperature of 276°F
Hint: The objects are identical except for their temperatures.
Answer:C. All three bricks have the same mass but different temperatures. Since the 276°F brick is the coldest, it has the least thermal energy. |
Question: Does this passage describe the weather or the climate?
Caleb lives in a city that is often covered by thick stratus clouds.
Options: (A) climate (B) weather
Hint: Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place.
Answer:A. Read the text carefully.
Caleb lives in a city that is often covered by thick stratus clouds.
This passage tells you about the usual clouds where Caleb lives. It does not describe what the weather is like on a particular day. So, this passage describes the climate. |
Question: Select the vertebrate.
Options: (A) green iguana (B) julia butterfly (C) black orb weaver spider (D) bull ant
Hint: Hint: Mammals, birds, fish, reptiles, and amphibians are vertebrates.
Answer:A. A bull ant is an insect. Like other insects, a bull ant is an invertebrate. It does not have a backbone. It has an exoskeleton.
Like other spiders, a black orb weaver spider is an invertebrate. It does not have a backbone. It has an exoskeleton.
A julia butterfly is an insect. Like other insects, a julia butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
A green iguana is a reptile. Like other reptiles, a green iguana is a vertebrate. It has a backbone. |
Question: Which object has more thermal energy?
Options: (A) a 9-kilogram block of iron at a temperature of 175°C (B) a 9-kilogram block of iron at a temperature of 165°C
Hint: The objects are identical except for their temperatures.
Answer:A. The two blocks of iron have the same mass but different temperatures. Since the 175°C block is hotter than the 165°C block, it has more thermal energy. |
Question: Select the animal that has a backbone.
Options: (A) kangaroo (B) comet moth
Hint: Hint: Mammals, birds, fish, reptiles, and amphibians all have backbones.
Answer:A. A comet moth is an insect. Like other insects, a comet moth does not have a backbone. It has a hard outer cover.
A kangaroo is a mammal. Like other mammals, a kangaroo has a backbone. |
Question: What information supports the conclusion that Tony inherited this trait?
Options: (A) Tony's parents have blond hair. They passed down this trait to Tony. (B) Tony's mother cuts his hair every month.
Hint: Read the description of a trait.
Tony has blond hair.
Answer:A. |
Question: Suppose Natalie decides to make potato soup. Which result would be a cost?
Options: (A) Natalie will save some time. The beef barley soup would have taken longer to make than the potato soup. (B) Natalie will give up the chance to eat the beef barley soup, which would have been tastier than the potato soup.
Hint: Natalie is deciding whether to make beef barley soup or potato soup for dinner. She wants dinner to be as tasty as possible. But she is also hungry and wants to eat soon.
Answer:B. This result is a cost. It involves giving up or spending something that Natalie wants or needs:
Natalie will give up the chance to eat the beef barley soup, which would have been tastier than the potato soup. |
Question: What information supports the conclusion that Ariana inherited this trait?
Options: (A) Ariana's father has brown eyes. He passed this trait down to Ariana. (B) Ariana's hair is the same color as her brown eyes.
Hint: Read the description of a trait.
Ariana has brown eyes.
Answer:A. |
Question: Using only these supplies, which question can Danny investigate with an experiment?
Options: (A) Do toy cars go faster down the ramp made of wood or the ramp made of cardboard? (B) Does a big toy car go down the wooden ramp faster than a small toy car? (C) Do toy cars with plastic wheels go faster down the cardboard ramp than toy cars with metal wheels?
Hint: Danny and his sister are building ramps to race their toy cars down. Danny notices that the cars go down some of the ramps faster than others. He wonders what factors affect the cars' speed. So, he decides to design an experiment. He has the following supplies available:
two identical toy cars
a wooden ramp three feet long and two feet tall
a cardboard ramp three feet long and two feet tall
Answer:A. |
Question: Using only these supplies, which question can Kamal investigate with an experiment?
Options: (A) Do rubber balloons stick to a wooden door or a metal door longer after being rubbed on his hair? (B) Do rubber balloons or foil balloons stick to the wooden door longer after being rubbed on his hair? (C) Do rubber balloons stick to a cotton blanket or a wooden door longer after being rubbed on his hair?
Hint: Kamal went to a magic show. The magician rubbed a balloon on her hair and then held the balloon against a wall. When the magician released the balloon, Kamal was amazed to see that it stuck to the wall! He wonders what factors affect how well balloons stick to different surfaces. So, he decides to design an experiment. He has the following supplies available:
the hair on his own head
a cotton blanket
a wooden door
five rubber balloons
Answer:C. |
Question: What information supports the conclusion that Russell acquired this trait?
Options: (A) Russell learned biology by doing experiments. (B) Russell is most interested in plant biology.
Hint: Read the description of a trait.
Russell knows a lot about biology.
Answer:A. |
Question: What is the volume of a soda bottle cap?
Options: (A) 10 liters (B) 10 milliliters
Hint: Select the better estimate.
Answer:B. The better estimate for the volume of a soda bottle cap is 10 milliliters.
10 liters is too much. |
Question: Based on this information, what is this pea plant's phenotype for the pod shape trait?
Options: (A) constricted pods (B) dd
Hint: This passage describes the pod shape trait in pea plants:
In a group of pea plants, some individuals have inflated pods and others have constricted pods. In this group, the gene for the pod shape trait has two alleles. The allele D is for inflated pods, and the allele d is for constricted pods.
A certain pea plant from this group has constricted pods. This plant has two alleles for constricted pods.
Answer:A. An organism's phenotype for a trait is its observable version of that trait. The pea plant's observable version of the pod shape trait is constricted pods. So, the plant's phenotype for the pod shape trait is constricted pods. |
Question: What information supports the conclusion that Fred acquired this trait?
Options: (A) Fred learned how to build a fire at summer camp. (B) Fred can cook food over a fire.
Hint: Read the description of a trait.
Fred knows how to build a fire.
Answer:A. |
Question: Suppose Tommy decides to plant the gardenias. Which result would be a cost?
Options: (A) Tommy will give up the chance to look at the palm tree. He thinks it would have looked more beautiful than the gardenias. (B) He will save some space. The gardenias will use up less space than the palm tree would have used up.
Hint: Tommy is deciding whether to plant gardenias or a palm tree in his backyard. He wants to make his backyard more beautiful. But he also wants to leave space for doing fun things.
Answer:A. This result is a cost. It involves giving up or spending something that Tommy wants or needs:
Tommy will give up the chance to look at the palm tree. He thinks it would have looked more beautiful than the gardenias. |
Question: Based on this information, what is Madelyn's phenotype for the Thomsen disease trait?
Options: (A) not having Thomsen disease (B) having Thomsen disease
Hint: This passage describes the Thomsen disease trait in humans:
In a group of humans, some individuals have Thomsen disease and others do not. In this group, the gene for the Thomsen disease trait has two alleles. The allele for not having Thomsen disease (m) is recessive to the allele for having Thomsen disease (M).
Madelyn is a human from this group. Madelyn has the homozygous genotype MM for the Thomsen disease gene.
Answer:B. Madelyn's genotype for the Thomsen disease gene is MM. Madelyn's genotype of MM has only M allelles. The M allele is for having Thomsen disease. So, Madelyn's phenotype for the Thomsen disease trait must be having Thomsen disease.
To check this answer, consider whether Madelyn's alleles are dominant or recessive. The allele for not having Thomsen disease (m) is recessive to the allele for having Thomsen disease (M). This means M is a dominant allele, and m is a recessive allele.
Madelyn's genotype of MM has two dominant alleles. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Madelyn's phenotype for the Thomsen disease trait must be having Thomsen disease. |
Question: Using only these supplies, which question can Lisa investigate with an experiment?
Options: (A) Do squash plants grow larger if the seeds are planted with compost or without compost? (B) If squash seeds and tomato seeds are planted with compost, which type of plant grows larger? (C) Do squash plants grow larger if the seeds are planted in small pots or in large pots?
Hint: Lisa has a small vegetable garden, which includes a compost pile of food scraps. She notices that some of the squash plants growing next to the compost pile grow differently than squash plants that are farther away. She wonders what factors affect how her squash plants grow. So, she decides to design an experiment. She has the following supplies available:
one type of squash seeds
four large clay pots
soil
a compost pile
water
Answer:A. |
Question: Which ball of clay has more thermal energy?
Options: (A) the hotter ball of clay (B) the colder ball of clay
Hint: Two 200-gram balls of clay are identical except for their temperatures.
Answer:A. The two balls of clay are made of the same material and have the same mass. So, the hotter ball of clay has more thermal energy. |
Question: What is the temperature of the air on a hot day?
Options: (A) 37°C (B) 37°F
Hint: Select the better estimate.
Answer:A. The better estimate for the temperature of the air on a hot day is 37°C.
37°F is too cold. |
Question: According to Newton's third law, what other force must be happening?
Options: (A) The gas pedal is pushing on Nina's foot. (B) The gas pedal is pulling on Nina's foot.
Hint: Isaac Newton was born in the 1600s and studied how objects move. He discovered three fundamental laws about forces and motion. According to Newton's third law, for every force, there is an equal and opposite force.
Consider the following force:
Nina's foot is pushing on her car's gas pedal.
Answer:A. Nina's foot is pushing on the gas pedal. So, Newton's third law tells you that the gas pedal is pushing on Nina's foot. |
Question: What information supports the conclusion that David acquired this trait?
Options: (A) David's scar was caused by an accident. He cut his arm when he fell off his bicycle. (B) Some scars fade more quickly than others.
Hint: Read the description of a trait.
David has a scar on his right arm.
Answer:A. |
Question: What information supports the conclusion that Elizabeth acquired this trait?
Options: (A) Elizabeth learned how to knit in an after school program. (B) Elizabeth knits sweaters using cotton, wool, and other types of yarn.
Hint: Read the description of a trait.
Elizabeth knows how to knit sweaters.
Answer:A. |
Question: Suppose Raymond decides to take a trip to Rhode Island. Which result would be a cost?
Options: (A) Raymond will spend more money. Plane tickets for Raymond to get to Rhode Island are more expensive than tickets to Illinois. (B) Raymond will enjoy his trip to Rhode Island more than he would have enjoyed a trip to Illinois.
Hint: Raymond is deciding whether to take a trip to Rhode Island or Illinois. He wants to enjoy his trip. But he is also trying to save money.
Answer:A. This result is a cost. It involves giving up or spending something that Raymond wants or needs:
Raymond will spend more money. Plane tickets for Raymond to get to Rhode Island are more expensive than tickets to Illinois. |
Question: How long is a paper clip?
Options: (A) 35 millimeters (B) 35 kilometers (C) 35 centimeters (D) 35 meters
Hint: Select the best estimate.
Answer:A. The best estimate for the length of a paper clip is 35 millimeters.
35 centimeters, 35 meters, and 35 kilometers are all too long. |
Question: Suppose Cameron decides to plant the amaryllises. Which result would be a cost?
Options: (A) Cameron will give up the chance to look at the magnolia tree. He thinks it would have looked more beautiful than the amaryllises. (B) He will save some space. The amaryllises will use up less space than the magnolia tree would have used up.
Hint: Cameron is deciding whether to plant amaryllises or a magnolia tree in his backyard. He wants to make his backyard more beautiful. But he also wants to leave space for doing fun things.
Answer:A. This result is a cost. It involves giving up or spending something that Cameron wants or needs:
Cameron will give up the chance to look at the magnolia tree. He thinks it would have looked more beautiful than the amaryllises. |
Question: Based on this information, what is Arietta's genotype for the fur texture gene?
Options: (A) Ff (B) straight fur
Hint: In a group of Syrian hamsters, some individuals have straight fur and others have wavy fur. In this group, the gene for the fur texture trait has two alleles. The allele F is for straight fur, and the allele f is for wavy fur.
Arietta, a Syrian hamster from this group, has straight fur. Arietta has one allele for straight fur and one allele for wavy fur.
Answer:A. An organism's genotype for a gene is its combination of alleles for that gene. Arietta has one allele for straight fur (F) and one allele for wavy fur (f). So, Arietta's genotype for the fur texture gene is Ff. |
Question: What information supports the conclusion that Bonnie acquired this trait?
Options: (A) Bonnie's friends like to make chili with her. (B) Bonnie learned how to make chili from a recipe book. (C) When Bonnie was young, her grandmother taught her how to cut chili peppers.
Hint: Read the description of a trait.
Bonnie knows how to make chili.
Answer:B. |
Question: Suppose Eva decides to plant the tulips. Which result would be a cost?
Options: (A) She will save some space. The tulips will use up less space than the hickory tree would have used up. (B) Eva will give up the chance to look at the hickory tree. She thinks it would have looked more beautiful than the tulips.
Hint: Eva is deciding whether to plant tulips or a hickory tree in her backyard. She wants to make her backyard more beautiful. But she also wants to leave space for doing fun things.
Answer:B. This result is a cost. It involves giving up or spending something that Eva wants or needs:
Eva will give up the chance to look at the hickory tree. She thinks it would have looked more beautiful than the tulips. |
Question: Based on this information, what is Hermes's phenotype for the coat pattern trait?
Options: (A) a black coat (B) a spotted coat
Hint: In a group of jaguars, some individuals have a black coat and others have a spotted coat. In this group, the gene for the coat pattern trait has two alleles. The allele for a black coat (A) is dominant over the allele for a spotted coat (a).
Hermes is a jaguar from this group. Hermes has the homozygous genotype aa for the coat pattern gene.
Answer:B. Hermes's genotype for the coat pattern gene is aa. Hermes's genotype of aa has only a alleles. The a allele is for a spotted coat. So, Hermes's phenotype for the coat pattern trait must be a spotted coat.
To check this answer, consider whether Hermes's alleles are dominant or recessive. The allele for a black coat (A) is dominant over the allele for a spotted coat (a). This means A is a dominant allele, and a is a recessive allele.
Hermes's genotype of aa has only recessive alleles. An organism with only recessive alleles for a gene will have the recessive allele's version of the trait. So, Hermes's phenotype for the coat pattern trait must be a spotted coat. |
Question: What is the mass of an elephant?
Options: (A) 4,115 kilograms (B) 4,115 grams
Hint: Select the better estimate.
Answer:A. The better estimate for the mass of an elephant is 4,115 kilograms.
4,115 grams is too light. |
Question: Select the one animal that has all of the arachnid traits listed above.
Options: (A) White-spotted octopuses have tentacles, which are also called arms. White-spotted octopuses can use their tentacles to reach between corals and grab fish. These octopuses have a soft red body with white spots. (B) Leaf-curling spiders spin webs with a leaf at the center. These spiders have an exoskeleton and eight legs, but no antennae.
Hint: Arachnids are a group of animals with similar traits. The following traits can be used to identify arachnids:
They have eight legs.
They have an exoskeleton.
They have no antennae. Observe the animals and read the descriptions.
Answer:B. To decide if an animal is part of a group, look at the traits of the group.
Arachnids have the following traits:
They have eight legs.
They have an exoskeleton.
They have no antennae.
Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits.
A leaf-curling spider has the following traits:
It has eight legs.
It has an exoskeleton.
It has no antennae.
A leaf-curling spider has the traits of an arachnid. A leaf-curling spider is an arachnid.
A white-spotted octopus has the following traits:
It has a soft body.
It has tentacles.
A white-spotted octopus does not have all of the traits of an arachnid. A white-spotted octopus is a mollusk. |
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