Scott Foresman Chapter 3 Study Guide

Why is a desert a system?

• People do not live there

• It consists mostly of plants

• Each part of the desert is independent

• It has parts that work together for a purpose

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Which best describes an ecosystem?

• a system where populations stay the same

• anywhere there is only one kind of organism

• a system where living and nonliving things interact`

• a place where there is always rain, soil, sunlight, and air

What is the best explanation for a decrease in a population of birds in a community?

• the amount of food decreases

• the amount of space increases

• the amount of water increases

• the amount of air stays the same

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What does the photo above show?

• the prairie dog's niche

• the prairie dog's habitat

• the prairie dog's ecosystem

• the prairie dog's community

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Which adaptation would be most useful to an animal whose niche is eating nectar from plants?

• fins

• wings

• fast legs

• short beak

What is the main energy source for all life on Earth?

• water

• sunlight

• chemicals

• green plants

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Which of these is a producer?

• deer

• grass

• hawk

• worm

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Which best describes the image?

• food web

• producers

• consumers

• food chain

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What is a decomposer?

• a dead animal or plant

• the waste of dead animals and plants

• consumers that get energy by eating only plants

• an organism like an insect that eats the remains of animals

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What is most likely to happen if most of a population of animals dies of disease?

• the food web will stop

• the decomposers will die

• the food web will change

• the producers will also get the disease

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