Ecosystems Review

Gardeners often add worms to their gardens. Why do you think they do that?

• To help worms provide food for birds, which help the plants.

• The worms are decomposers and change organic matter into nutrients.

• Worms help to keep the soil moist, which helps the plants.

• Worms help keep harmful insects away from the plants' roots.

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Many people like to eat morel mushrooms. Where would be the best place to find one?

• By the edge of a pond

• in a grassy field

• on the tundra near lichens

• near a fallen tree in the forest

The mice in the grasslands rely on the wide variety of plants to survive. What role do the plants play?

• consumer

• decomposer

• producer

• prey

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Which organism acts as the recycling agent in a food chain?

• consumer

• decomposer

• producer

• scavenger

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In an experiment, one tomato plant is placed in the sun, and one is placed in the shade. Which plant will produce more tomatoes?

• The one in the shade because it will be protected from the heat.

• The one in the sun because more photosynthesis will occur.

• The one in the shade because fewer insects will bother it.

• The one in the sun because the sun will ripen the tomatoes faster.

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Which class of organisms is needed to put minerals and nutrients back into an ecosystem?

• consumer

• decomposer

• producer

• scavenger

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What must an ecosystem have in the greatest abundance to support a large number of organisms?

• carnivores

• consumers

• herbivores

• producers

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What is the principle role of decomposers?

• Decomposers break down dead or decaying organisms.

• Decomposers serve as a middle link in the food chain.

• Decomposers are on top of the energy pyramid.

• Decomposers use the process of photosynthesis to make food.

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On what do consumers rely for survival in an ecosystem?

• producers

• shelter

• space

• water

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Which organism needs sunlight to make its own food?

• caterpillar

• frog

• plant

• snake

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