DNMQ #59: Nutrient Cycles Review (F23)

What is the main source of carbon in the carbon cycle?

• carbon dioxide (CO2)

• carbonated beverages

• carbon monoxide (CO)

• carbonate rocks

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Which process releases carbon dioxide into the atmosphere?

• evaporation

• photosynthesis

• respiration

• combustion

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What is the role of decomposers in the carbon cycle?

• Decomposers break down dead organic matter and release carbon dioxide into the atmosphere.

• Decomposers convert carbon dioxide into organic matter.

• Decomposers have no role in the carbon cycle.

• Decomposers absorb carbon dioxide from the atmosphere.

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What is nitrogen fixation?

• The process of converting nitrogen gas into carbon dioxide by bacteria.

• The process of converting nitrogen gas into oxygen by plants.

• The process of converting nitrogen gas into water by industrial processes.

• The process of converting nitrogen gas into a usable form by bacteria or industrial processes.

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Which organisms convert nitrogen gas into ammonia?

• nitrogen-fixing bacteria

• nitrogen-fixing archaea

• nitrogen-fixing plants

• nitrogen-fixing fungi

What is denitrification?

• Denitrification is a process in which nitrate is converted into nitrite.

• Denitrification is a process in which nitrate is converted into nitric acid.

• Denitrification is a process in which nitrate is converted into ammonia.

• Denitrification is a microbial process in which nitrate (NO3-) is converted into nitrogen gas (N2) and released into the atmosphere.

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What is the primary source of phosphorus in the phosphorus cycle?

• plants and animals

• water bodies

• rocks and minerals

• atmosphere

How does phosphorus enter the food chain?

• Phosphorus enters the food chain through the process of digestion.

• Phosphorus enters the food chain through the process of photosynthesis.

• Phosphorus enters the food chain through the process of respiration.

• Phosphorus enters the food chain through the process of phosphorus cycling.

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What is transpiration in the water cycle?

• Transpiration is the process by which water is converted into vapor in the atmosphere.

• Transpiration is the process by which water is lost from plants through the stomata in their leaves.

• Transpiration is the process by which water is absorbed by plants through their roots.

• Transpiration is the process by which water is stored in the soil.

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Select 2 types of organisms that assist with nitrogen fixation.

• animals

• bacteria

• bean plants

• trees