Pyramid of Number and Biomass

An example of a producer is a

• fungus.

• animal.

• plant.

• person.

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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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The approximate amount of energy that is transferred between each trophic level is:

• 10%

• 0.1%

• 90%

• It totally depends on the ecosystem.

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What does a pyramid of numbers compare?

• the number of individual organisms at each trophic level

• the number of individuals in each population

• the number of predators and prey in an ecosystem

• the number of different populations at each trophic level

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The ecological pyramid that shows the number of organisms that were counted at each trophic level is called a pyramid of _______________

Which of the following examples would result in an inversion of a pyramid of numbers?

• a tree with thousands of spiders

• a forest of trees with a small herd of deer

• a tree with a spotted owl

• a forest of trees with a pack of wolves

Why are there generally a maximum of five trophic levels?

• It's far easier to draw a pyramid that way.

• Because energy is lost at each level, there isn't enough energy left to support any more consumers.

• Generally a top predator is so fierce it has no predators and therefore can rule the top trophic level without fear.

• There simply is not a word beyond quaternary.

• BTW the word after quaternary is quinary (always read all the options in multiple choice questions)

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What is biomass?

• the total dry weight of organisms in an ecosystem

• the total weight of organisms in an ecosystem

• the total dry weight of producers in an ecosystem

• the total weight of animals in an ecosystem