How Ecosystems Work

When organisms use sunlight to make sugar, this process is known as

• carbohydrates

• photosynthesis

• cellular respiration

• biomagnification

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An organism that makes its own food is known as a

• producer

• consumer

• feeder

• herbivore

What are the 3 types of consumers?

• herbivore, carnivore, autotroph

• autotroph, omnivore, herbivore

• herbivore, autotroph, carnivore

• herbivore, carnivore, omnivore

What is cellular respiration?

• breaking down of sugar to produce carbohydrates

• breaking down of carbohydrates to produce autotrophs

• breaking down of oxygen to create carbon dioxide

• breaking down of carbohydrates to produce energy

The difference between a food chain and a food web is:

• a food chain includes numerous organisms; a food web does not.

• a food web requires one or more consumers and producers

• A food chain is when energy is transferred from one organism to another organism; a food web includes more organisms and shows feeding relationships

• A food web is when energy is transferred from one organism to another organism; a food chain includes more organisms and shows feed relationships

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What is a trophic level?

• Each step through which energy is transferred in the food chain

• Each step through which energy is transferred in a food web

• the way to visualize the loss of energy from one organism to another

• the way energy is transferred from one organism to the other

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Which of the items listed is a composer

• grass

• bacteria

• tree

• squirrel

Organisms require energy for all of their life functions, about what percentage of energy is used through each trophic level?

• 1 percent

• 5 percent

• 10 percent

• 50 percent

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In the cycling of matter, which cycle includes nitrogen-fixing bacteria?

• carbon cycle

• nitrogen cycle

• phosphorus cycle

• ecologicalcycle

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Some snakes produce a powerful poison that paralyzes their prey . The poison is an example of

• resistance

• adaptation

• reptile

• biotic factor

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