Nitrogen Cycle Quiz

Which process in the nitrogen cycle converts atmospheric nitrogen (N₂) into a form that plants can use?

• Denitrification

• Nitrification

• Fixation

• Ammonification

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

• They convert nitrates back into atmospheric nitrogen

• They decompose dead organisms and release ammonia

• They convert ammonia into nitrates

• They convert atmospheric nitrogen into ammonia

Why is the nitrogen cycle important for ecosystems?

• It regulates the pH of soil and water

• It provides essential nutrients for plant growth

• It controls the temperature of the atmosphere

• It determines the color of plants and animals

What is the process by which nitrogen compounds in the soil are converted back into atmospheric nitrogen?

• Nitrification

• Assimilation

• Ammonification

• Denitrification

Nitrogen-fixing Bacteria help to convert nitrogen gas into usable nitrogen. These bacteria can be found in ​ (a)   .

• sunflowers
• leaves
• ocean
• legumes

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112.34.c.12.D

In a garden, which process directly involves the plants when they utilize nitrogen?

• Nitrogen fixation

• Nitrification

• Denitrification

• Assimilation

Nitrification is a process that converts:

• Nitrogen gas into ammonia

• Ammonia into nitrites and then nitrates

• Nitrates into nitrogen gas

• Nitrogen gas directly into nitrates

What is the term for the process where nitrogen gas is returned to the atmosphere?

• Nitrogen Fixation

• Nitrification

• Denitrification

• Ammonification