Unit 2a Lesson 3 TEST: Role of Decomposers

How do decomposers help plants?

• They help with photosynthesis.

• They enrich the soil.

• They provide oxygen.

• They hold water.

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_________ can sprout from the soil like plants, but cannot make its own food.

• Fungus or Fungi

• Roots

• Flowers

Energy and other materials from dead organisms are recycled back into the soil by

_____.

• producers

• herbivores

• omnivores

• decomposers

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Organisms, such as fungi and (1)__________, that break down dead organisms

and return them as nutrients to the soil, are known as (2)__________.

• (1) bacteria

  (2) decomposers

• (1) decomposers

  (2) bacteria

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People can help nature recycle plant material by composting. People use compost in their gardens. How does placing compost in your garden improve the natural

environment?

• It makes the soil harder.

• It makes the soil unusable.

• It helps keep insects away.

• It makes the soil rich in nutrients.

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Fill in the blanks using the available answer choices.

_________ break down decaying material in an ecosystem.

• Producers

• Decomposers

The job of decomposers is to break down dead plants and animals into useful

substances. This job is their _________.

• adaptation

• skill

• niche

• habitat

Mrs. West’s class created this diagram as a model of an ecosystem. The class uses the model to predict how the living things in the ecosystem could be affected during periods of drought.

a. Predict how drought could affect the amount of food for each organism shown in the

model.

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Mrs. West’s class created this diagram as a model of an ecosystem. The class uses the model to predict how the living things in the ecosystem could be affected during periods of drought.

b. Predict how the ecosystem would be affected if the decomposers shown in the model

die.

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A living organism that puts energy and materials from dead  plants and animals back to the soil is called a ____________?

• carnivore

• decomposer

• herbivore

• omnivore