General Principles of Ecology

What do herbivores eat?

• fish
• seeds & meat
• plants & fruits
• walnuts & bugs 

Organisms that get their energy directly from the sun are known as: 

• secondary consumers
• heterotrophs
• producers
• primary consumers 

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Organisms that can make their own food are known as: 

• heterotrophs
• primary consumers
• tertiary consumers
• autotrophs 

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Which level of organization is shown? 

• biosphere
• community 
• population 
• ecosystem 

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Which level of organization is shown? 

• individual
• population
• ecosystem
• community 

A variety of living things in an ecosystem is:

• sucession
• biodiversity 
• ecological fitness 
• none of the above 

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A species that has an unusually large effect on its ecosystem is:

• endemic species
• keystone species
• endangered species
• threatened species 

Identify a biotic factor. 

• water
• sunlight
• soil pH
• plants 

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Which trophic level provides most of the energy in a food chain?

• producers
• primary consumers
• secondary consumers
• tertiary consumers 

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Living factors are:

• abiotic factors 
• biotic factors 

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