Matter Cycling Questions

How do you think planting many trees would affect the carbon cycle?

• The amount of carbon dioxide in the atmosphere would decrease because plants use CO2 during photosynthesis.

• The amount of carbon dioxide in the atmosphere would increase because plants release CO2 during photosynthesis.

• The amount of carbon dioxide in the atmosphere would increase due to burning fossil fuels.

• The amount carbon dioxide in the atmosphere would decrease because it will cause the ocean to dissolve more CO2

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How do animals get nitrogen?

• Assimilation through roots

• Denitrification into nitrogen gas

• Eating plants or animals

• Ammonification by decomposers

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Why is the cycling of phosphorus important to living things?

• Phosphorus is important because it forms carbohydrates, lipids, and ATP.

• Phosphorus is important because plants create it during photosynthesis.

• Phosphorus is important because it forms DNA, RNA, and phospholipids.

• Phosphorus is important because it makes up 78% of the atmosphere.

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Plants get ​ (a)   by performing photosynthesis. During this process CO2 is rearranged to from the ​ (b)   glucose.​

• carbon
• sugar
• nitrogen
• protein
• phosphorus
• nucleic acid

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How do plants get carbon?

• Photosynthesis

• Cellular respiration

• Combustion

• Formation of fossil fuels

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If a chemical killed all of the bacteria in a forest, how would the nitrogen cycle be affected?

• The nitrogen cycle would continue to work, but at a slower pace.

• The nitrogen cycle would not continue because bacteria is important in converting nitrogen gas into other forms.

• The nitrogen cycle would continue to work, but plants would have to start taking nitrogen during photosynthesis.

• The nitrogen cycle would not continue because bacteria create nitrogen during cellular respiration.

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Why is nitrogen important to living things?

• Makes up carbohydrates and lipids

• Makes up proteins and nucleic acids

• Makes up phospholipids and glucose

• Makes up carbon dioxide and phosphate

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Why is carbon important to living things?

• Carbon is the source of fossil fuels.

• Carbon is found in all macromolecules.

• Carbon is fixed by carbon fixing bacteria.

• Carbon is washed into rivers by runoff.

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How do plants get phosphorus?

• weathering of rocks

• Geographic uplift

• absorbed through their roots

• fertilizer runoff into streams

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How do animals get carbon?

• Photosynthesis

• Cellular respiration

• Combustion

• Consume plants or animals

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