8.13B Carbon and Nitrogen Cycle

How does carbon in a grass plant get into a lion?

• The lion eats an antelope that ate the grass

• Carbon from grass doesn't end up in a lion.

• The lion absorbs the carbon given off by transpiration

• The lion breathes in carbon given out by the plant

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What is happening at 1?

• respiration: releasing CO₂
• decomposing CO₂ in the soil
• photosynthesis: absorbing CO₂
• turning CO₂ from the atmosphere into organic molecules

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What would happen within the nitrogen cycle if a bactericide, a substance that kills bacteria, was added to the soil?

• The rate at which nitrogen is broken down would increase, resulting in faster absorption by plants.

• Microorganisms would not be present to break down the nitrogen into a usable form for plants.

• More nutrients would be added to the soil, increasing the amount of nitrogen available to plants.

• Nitrogen would be blocked from entering the soil, making it unavailable for plants to use.

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When sawdust is added to soil, organisms in the soil will use all the available nitrogen to break the sawdust down. What effect will the lack of nitrogen have on the plants that are near the sawdust?

• The plants will not be able to grow.

• The plants will grow faster than before.

• The plants will be replaced with new plants.

• The plants will evolve to no longer need nitrogen.

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What is the significance of the carbon and nitrogen cycles to ecosystem stability?

• They provide energy to the ecosystem.

• They help in the recycling of nutrients.

• They increase the population of predators.

• They reduce the need for sunlight.

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What could be a consequence of disrupting the carbon and nitrogen cycles?

• Increased biodiversity

• Enhanced plant growth

• Ecosystem instability

• More oxygen production

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Which component can be added to the flask to reduce the concentration of carbon dioxide in the model atmosphere created by the disks?

• Bacteria to use carbon during nitrification

• Plants to absorb carbon in the process of photosynthesis

• Snails to use carbon through cellular respiration

• Mushrooms to absorb carbon during decomposition

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• F

• G

• H

• I

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What would be the most likely effect of a wildfire that burned a large area of a forest?

F More sugars and starches would be available for animals in the area.

G The availability of fossil fuels for use by industries in the area would be reduced.

H Less carbon dioxide would be removed from the atmosphere in the area by plants.

J An increase in animal respiration would increase the release of carbon dioxide in the area.

• F

• G

• H

• J

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How does carbon get from animals and back into the atmosphere? (CHOOSE ALL THAT APPLY)

• Respiration (breathing)

• After they die, they are broken down by decomposers

• Photosynthesis

• None of these

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