Exploring the Nitrogen Cycle

What is the primary role of nitrogen-fixing bacteria in the nitrogen cycle?

• They convert nitrates into nitrogen gas.

• They convert atmospheric nitrogen into ammonia.

• They decompose organic matter.

• They assimilate nitrates into plant tissues.

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Which of the following is a key function of decomposers in the nitrogen cycle?

• Fixing atmospheric nitrogen.

• Converting ammonia into nitrates.

• Breaking down dead organisms to release nitrogen.

• Assimilating nitrates into plant tissues.

What process involves the conversion of ammonia into nitrates?

• Nitrate assimilation

• Nitrogen fixation

• Nitrification

• Denitrification

Which type of bacteria is responsible for converting nitrates back into nitrogen gas?

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Denitrifying bacteria

• Decomposers

What is nitrate assimilation?

• The process of converting nitrogen gas into ammonia.

• The uptake of nitrates by plants to form proteins.

• The conversion of ammonia into nitrites.

• The release of nitrogen gas into the atmosphere.

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How does the nitrogen cycle benefit plant growth?

• By providing oxygen for photosynthesis.

• By supplying essential nutrients for protein synthesis.

• By increasing carbon dioxide levels.

• By reducing soil acidity.

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What is the relationship between the nitrogen cycle and the food cycle for animal life?

• Animals directly fix atmospheric nitrogen.

• Animals rely on plants that assimilate nitrogen for their protein needs.

• Animals convert nitrates into ammonia.

• Animals decompose organic matter to release nitrogen.

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Which of the following is NOT a key term related to the nitrogen cycle?

• Decomposers

• Photosynthesis

• Nitrifying bacteria

• Denitrifying bacteria

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What role do nitrifying bacteria play in the nitrogen cycle?

• They fix atmospheric nitrogen into ammonia.

• They convert ammonia into nitrites and nitrates.

• They decompose organic matter.

• They assimilate nitrates into plant tissues.

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Which process in the nitrogen cycle directly contributes to the release of nitrogen gas back into the atmosphere?

• Nitrate assimilation

• Nitrogen fixation

• Denitrification

• Nitrification