Do Now Ch 4: Energy and Matter in Ecosystems

Which process in plants converts carbon dioxide and water into glucose and oxygen using sunlight?

• Cellular respiration

• Photosynthesis

• Fermentation

• Decomposition

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What percentage of energy is typically transferred from one trophic level to the next in an energy pyramid?

• 1%

• 10%

• 50%

• 100%

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Which of the following is a product of cellular respiration?

• Glucose

• Oxygen

• Carbon dioxide

• Sunlight

Which of the following best describes anaerobic conditions?

• Conditions with plenty of oxygen

• Conditions with no oxygen

• Conditions with high sunlight

• Conditions with low carbon dioxide

A student observes that a mouse eats seeds and is then eaten by a snake. Which trophic level does the mouse occupy?

• Producer

• Primary consumer

• Secondary consumer

• Decomposer

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NGSS.MS-LS2-3

Which statement best explains the role of photosynthesis in the carbon cycle?

• It releases carbon dioxide into the atmosphere.

• It removes carbon dioxide from the atmosphere and stores it in glucose.

• It converts glucose into carbon dioxide.

• It breaks down carbon compounds in the soil.

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During aerobic respiration, which molecule is required for the complete breakdown of glucose?

• Nitrogen

• Oxygen

• Carbon dioxide

• Water

If a grassland ecosystem has 10,000 kcal of energy at the producer level, how much energy would you expect to be available to the secondary consumers?

• 10,000 kcal

• 1,000 kcal

• 100 kcal

• 10 kcal

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A student claims that both photosynthesis and cellular respiration are essential for the cycling of carbon in the biosphere. Use evidence to support or refute this claim.

• Only photosynthesis is essential because it removes carbon from the atmosphere.

• Only cellular respiration is essential because it returns carbon to the atmosphere.

• Both are essential: photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration returns it, maintaining the carbon cycle.

• Neither process is essential for the carbon cycle.

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Compare the cycling of matter and flow of energy in aerobic and anaerobic conditions. Construct an explanation based on evidence.

• In both conditions, energy flow is the same, but matter cycling is different because only aerobic conditions recycle carbon.

• Aerobic conditions allow for more efficient energy transfer and complete breakdown of glucose, while anaerobic conditions result in less energy and different byproducts, affecting both energy flow and matter cycling.

• Anaerobic conditions produce more energy than aerobic conditions, so matter cycles faster.

• There is no difference in matter cycling or energy flow between aerobic and anaerobic conditions.

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