Ecosystems Review #1

How are bacteria classified in a forest ecosystem?

• as consumers

• as decomposers

• as herbivores

• as producers

An ecosystem is a community of organisms interacting with their physical environment. Why are decomposers an important part of ecosystems?

• They break down dead organisms to return nutrients to the soil.

• They produce their own food for survival.

• They play a role in preventing weathering and erosion.

• They provide most of the energy to consumers.

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A brown bear eats a variety of foods including berries, insects, and small animals. Which BEST describes a brown bear?

• producer

• consumer

• decomposer

• vegan

The main function of a producer in an ecosystem is to...

• absorb minerals from the soil.

• change water vapor into a liquid.

• convert energy from the sun through the process of photosynthesis.

• break down dead plant and animal matter.

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Which organism is a producer?

• frog

• mushroom

• grass

• lizard

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Josie made the following list to classify some of the biotic (living) and abiotic

(nonliving) factors of a rainforest ecosystem. How should Josie classify the factor of temperature on her list?

• Temperature is a biotic factor.

• Temperature is an abiotic factor.

• Temperature is a producer.

• Temperature is a decomposer

Josie made the following list to classify some of the biotic (living) and abiotic

(nonliving) factors of a rainforest ecosystem. Josie wants to add bacteria to her list. How should she classify it?

• Bacteria is a producer.

• Bacteria is a consumer.

• Bacteria is an abiotic factor.

• Bacteria is a biotic factor.

How are plants and algae best classified in an aquatic (water-based) ecosystem?

• Plants and algae are best classified as producers.

• Plants and algae are best classified as consumers.

• Plants and algae are best classified as decomposers.

• Plants and algae are best classified as abiotic.

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A simple food chain includes hawks, lizards, and insects. Which will most likely happen to the lizard and hawk populations if a pesticide is sprayed to kill the insects, and the lizard and hawk populations cannot find other food in this ecosystem?

• both the lizard population and the hawk population will increase.

• Both the lizard population and the hawk population will decrease.

• The lizard population will increase, but the hawk population will decrease.

• The lizard population will decrease, but the hawk population will increase.

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Recently, a family of bobcats moved into an area with a large rabbit population. What changes may occur in the ecosystem?

• The rabbit population may increase
• The rabbit population may decrease
• The rabbit population may increase first, then decrease
• The rabbit population will remain the same

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