Unit 3 Chapter 3

1. A group of students observe some starfish while on a field trip. A starfish is shown in the picture.

Most of the starfish have five arms, but two of the starfish each have arms that are much shorter than their other arms. A worker tells the students that the shorter arms were once missing because they were probably eaten by a fish or a crab, but the arms have started to grow back. 

Which of the following best describes how starfish are able to regrow their arms?

• Starfish learn how to regrow arms.

• Starfish inherit the ability to regrow their arms.

• 1. Starfish eat food that causes them to grow arms.

• Starfish move to warmer water that causes their arms to regrow.

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Which of the following best describes how raspberries get their color?

• Raspberry color is an inherited trait that varies among raspberry plants.

• Raspberry color is controlled by the amount of sugar the plant produces.

• Raspberry color is controlled by the amount of sunlight it receives.

• Raspberry color is an inherited trait that changes if the plant has a disease. 

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Use the picture of the carrots below and your knowledge of science to answer the questions. PART A: Which carrot plant most likely got the greatest amount of sunlight in its environment?

• Carrot A, the smallest carrot

• 1. Carrot B, the second smallest carrot

• 1. Carrot C, the second longest carrot 

• Carrot D, the longest carrot

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Use the picture of the carrots below and your knowledge of science to answer the questions.

PART B: Which statement best supports that carrot D received the most amount of sunlight in its environment? 

• 1. Sunlight does not help a carrot plant grow longer.

• 1. The more sunlight the plant receives, the more the plant will grow.

• 1. Carrot plants only grow if their parent plant grew. 

• 1. The more sunlight the plant receives, the     less the plant will grow.

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Which two statements best describe examples of traits resulting from both inheritance and interaction with the environment? Select 2.

• 1. Redwood trees have the ability to grow really tall.

• The vervet monkey can only make one alarm call.

• A song sparrow has the ability to sing and sing specific songs.

• The grizzly bear uses only one fishing style to grab fish.

• 1. The decorator crab decorates his shell with a sea sponge.

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The marigold plants in this field all have the same parents. Some of the plants are growing in the sun, and some are growing in the shade under a tree. The plants in the sunny area have more flowers than the plants in the shade. 

Which statement best explains the difference between the two groups of flowers shown?

• 1. The number of flowers produced depends on the traits inherited from the parent plant.

• The number of flowers produced depends on the environment.

• 1. The number of flowers produced is different with different plants. 

• 1. The number of flowers produced only depends on the amount of water received by the flower. 

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Which of the following are examples of inherited traits? Select 2.

• antlers

• mosquito bites

• thick fur to stay warm

• moves to where food is available

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a group of the same kind of organism living in the same area make up a…

• environment

• population

• inference

All the living and nonliving things in an area make up an …

• environment

• inference

• organism

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When it’s easy for organisms to meet their needs in their

environment, they are ….

• a) less likely to survive.

• b) more likely to survive

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