Science Prep: Symbiosis and Food Webs

How are Bacteria and Fungi important to an ecosystem?

• They break down other organisms

• They create oxygen

• They create carbon dioxide

• They're a major food source

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What is a population?

• members of a species that live in the same space at the same time

• all members of a species

• all organisms that live in the same ecosystem

• abiotic factors on an ecosystem

The prime source of energy in ecosystems is what?

(Hint: What gives energy to your producers?)

• Water

• The Sun

• Nutrients

• Freedom

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Which animal listed is most likely to be an ecosystem's "keystone species"?

• Grass

• Rabbits

• Crickets

• Fox

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Consumers are organisms that

• are also known as "autotrophs", or "self feeders"

• get their energy from eating other organisms

• occupy the lowest trophic level of an ecosystem

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Producers are organisms that

• are also known as "autotrophs", or "self feeders"

• get their energy from eating other organisms

• occupy the lowest trophic level of an ecosystem

The difference between a predator and a parasite is that a predator....

• usually kills and eats its prey

• lives in or on a host, usually affecting the host negatively

• helps its prey or host live a long, healthy life

The difference between a predator and a parasite is that a parasite....

• usually kills and eats its prey

• lives in or on a host, usually affecting the host negatively

• helps its prey or host live a long, healthy life

Which species is most likely to be an ecosystem's "pioneer species"?

• Mountain Lion: maintains "territory"

• River Trout: lives in moving water

• Lichen: colonize and spread to rocks, trees, all areas

• Algae: grows in standing water

What are the "ABIOTIC" factors listed?

• soil

• water

• food

• climate

• infectious disease

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