Science Form 2_Chap 2 Ecosystem

Look at the diagram of the food web. The arrows means “eaten by.”

What will happen if the number of snakes goes down?

• The owl will eat the grass

• The number of frogs will go down

• The hawk and owl will have less food

• The number of mice and grasshoppers will go up.

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The transfer of energy from one organism to the next in an ecosystem begins with a producer. A producer is an organism that produces its own food. A consumer is an organism in a food chain that obtains energy from producers or other consumers; consumers may be herbivores or carnivores.

Which food chain correctly describes the flow of energy in an ecosystem?

• grass → grasshopper → fish → human

• grasshopper → fish → human

• human → fish → grasshopper

• human → grasshopper → fish → grass

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What happens to the amount of available energy in the pyramid as it moves up through the different levels?

• it increases

• it decreases

• it remains the same

• it decreases, then increases

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An organism that can make its own food is called?

• Consumer
• Producer
• Decomposer
• Herbivore

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All food chains begin with a ____________.

• primary consumer
• secondary consumer
• producers
• scavengers

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A consumer gets energy by doing what?

• Making it themselves.
• Breaking down biotic wastes and dead organisms and returning raw materials to the ecosystem.
• Soaking it up from the ground.
• Feeding on other organisms.

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An organism that lives by breaking apart dead organic matter into simpler parts is...

• scavenger
• consumer
• decomposer
• carnivore

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An animal that eats other animals is a....

• carnivore
• omnivore
• herbivore
• decomposer

In any food web, the organisms that are responsible for converting raw energy into usable chemical energy are collectively called ________ while organisms that recycle the nutrients trapped in dead organisms are collectively called ________.

• producers;consumers

• producers; decomposers

• heterotrophs; consumers

• heterotrophs;autotrophs

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This is the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.

• Physics
• Ecology
• Chemistry
• Psychology

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