Chapter 42

Energy ____ ____while matter ____ ____an ecosystem

• cycles within, flows through

• flows through, cycles within

• cycles within, cycles within

• flows through, flows through

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Which two factors most directly affect primary production on land?

• light and nutrients

• light and temperature

• temperature and precipitation

• precipitation and matter cycles

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Dumping nutrients into an aquatic ecosystem often leads to _____

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The amount of chemical energy used for growth/accumulating biomass is also known as

• primary production

• secondary production

• net primary production

• cellular respiration

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On average, approximately _____ of energy passes on to the consumer

• 5-15%

• 10 kcal

• 80-90%

• 50 kcal

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Biomass pyramids have

• more primary consumers

• more primary producers

• more secondary consumers

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__________________ is when we use living organisms to remove a toxin from an ecosystem

Cellular respiration and photosynthesis are two key aspects of

• the carbon cycle

• the nitrogen cycle

• the phosphorous cycle

• the water cycle

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The law of conservation of mass states that matter cannon be ___________ nor __________

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If there is 25 kcal of energy in the producer, how much energy would you expect there to be in the secondary consumer?

• 250 kcal

• 2.5 kcal

• 0.25 kcal

• 12.5 kcal

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