Ecology Chapter 3

An organism that produces its own food supply from inorganic compounds is called a(an)

• heterotroph
• consumer
• detritivore
• autotroph

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NGSS.MS-LS2-3

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

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What is the term for each step in the transfer of energy and matter within a biological community?

• energy path
• food web
• trophic level
• food pyramid

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Autotrophs make up the _______ level in all ecosystems.

• First
• Second
• Third
• Fourth

A living relationship between two species in which one organism is harmed is called...

• mutualism
• commensalism
• parasitism
• niche

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symbiotic relationship in which both organisms benefit

• competition
• Mutualism
• nitrogen fixation
• energy pyramid

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What does a food web represent?

• All connections of energy flow throughout all organisms in a habitat.
• The specific ways that mutualism is carried out.
• A single pathway or energy flow between organisms. 
• How carnivores get their food. 

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The amount of energy that usually transfers from one trophic level to the next...

• 10%
• 20%
• 80%
• 50%

Which of the following would be the definition of a detritivore?

• Animals that eat insects.
• Organisms that feed on rocks, recycling the nutrients back into the ground.
• Organisms that eat only pants
• Things that feed on dead organisms, recycling the nutrients back into the ground.

The nonliving aspects of an ecosystem.

• Abiotic factors
• Biotic factors

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