Food Webs and Trophic Pyramids

A food web is a model that shows

• the types of foods different organisms can eat.

• the number of available food sources in any given ecosystem.

• the feeding relationships between organisms in an ecosystem

• the way different organisms use the energy they obtain from their food

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How do food webs represent the flow of energy in the model?

• Food web models represent energy flow using arrows.

• Food web models represent energy flow by separating predator and prey.

• Food web models represent energy flow by organizing organisms by size.

• Food web models represent energy flow through chemical reaction equations

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Matter flowing through a food web

• take one path.

• take opposite paths.

• always takes the same path.

• can take more than one path.

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A food chain is

• an individual path in a food web.

• a list of available prey for predators.

• a term to describe how matter is recycled in a food web.

• the chemical reaction that happens when an organism eats food.

Which of these describes a purpose of a food chain?

• A food chain attracts predators to available prey.

• A food chain tracks the transfer of matter and energy.

• A food chain teaches scientists how to add more predators to an ecosystem.

• A food chain tracks all the feeding relationships between organisms in an ecosystem.

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Which of these describes a direct effect of an interaction in a food web?

• An increase in rain causes an increase of coyotes.

• An increase in wildfires causes a decrease in rattlesnakes.

• An increase in humans causes a decrease in supermarkets.

• An increase in rabbits causes a decrease in plant populations.

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An indirect effect is an interaction in a food web where

• a natural disaster affects the total populations of all organisms in a food web.

• one population affects the abundance of another through its effect on a third population.

• matter and energy suddenly are transferred in a different direction than they hand been flowing

• All of the above.

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Which of these is a decomposer?

• bacteria

• a dead worm

• a fox

• a hummingbird

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Which of these is NOT a form of waste?

• dung

• shedding skin cells.

• dead leaves

• mushrooms

How is a decomposer also a consumer?

• A decomposer only eats consumers

• A decomposer consumes only energy, but no matter.

• A decomposer consumes the remains of other organisms.

• A decomposer only consumes, but does not produce matter.

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