Food Webs and Trophic Pyramids

An example of a producer is a

• fungus.

• animal.

• plant.

• person.

The diagram is intended to show relationships in an ecosystem. What do the arrows represent?

• The direction of population migration
• Differences in dietary habits
• Progressively smaller organisms
• The direction of the energy flow

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In the energy pyramid here, which organisms have the most energy available?

• Producers
• Carnivores
• Herbivores
• Top Predator

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The relationship between ALL the organisms in a community showing who eats whom is called a ___________________________.

• Food Web
• Food Chain
• Abiotic Factors
• Biotic Factors

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What is biomass?

• the total weight of organisms in an ecosystem

• the total weight of producers in an ecosystem

• the total weight of animals in an ecosystem

Which one is most likely the pyramid of biomass?

• A

• B

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Only 10% of an organism's energy is available for the next trophic level. What happens with the other 90% of the energy that doesn't reach the next trophic level?

• It is destroyed after it is used up

• It is used for life processes like movement, creating offspring producing waste or lost as body heat

• It is used to grow plants

• It supplies planet Earth with light and heat

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Which statement best describes what will happen if the population of herbivores in the community decreases?

• the population of foxes will increase

• the population of hawks will increase

• the population of rabbits will increase

• the population of meadow plants 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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A population of mice lives in a barn community. A cat population has just joined the community. What will happen?

• Mouse and cat populations both go up?
• Mouse and cat populations both go down
• Mouse population goes down as cat population goes up
• Mouse population goes up as cat population goes down

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