8.3.3 Carbon Cycle and Ecosystems (Food Chains & Webs)

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

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How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

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How does the carbon in grass become part of a lion?

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the lion's food chain. 
• The lion breathes in carbon given out by the plant

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Temperature, light, air, water, and soil are all  _____  parts of the environment

• alive
• biotic 
• abiotic
• living

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A living or once-living organisms in an ecosystem is a

• population
• biotic factor
• abiotic factor
• community

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A nonliving element in an ecosystem is an 

• animal
• abiotic factor
• biotic factor
• organism

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What are the biotic factors in this image?

• sunlight, elephants, and grasses
• sunlight, water,  and air
• elephants, plants, trees 

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A system made up of organisms interacting with one another

• biology
• abiotic
• biotic
• ecosystem

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What percentage of energy is passed on to each tropic level?

• 10%
• 50%
• 90%
• 100%

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What might happen if you remove a primary consumer from the ecosystem?

• There would be more food for secondary consumers.
• The number of primary consumers would increase.
• The number of plants would increase.
• The number of secondary consumers would increase.

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