Nitrogen Cycle Quiz

Which process in the nitrogen cycle is primarily responsible for converting nitrogen gas from the atmosphere into ammonia?

• Nitrification

• Nitrogen fixation

• Denitrification

• Ammonification

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DOK Level 2: Skill/Concept

In the nitrification process, what is the first compound that ammonia is converted into?

• Nitrous oxide

• Nitric acid

• Nitrite

• Nitrate

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DOK Level 2: Skill/Concept

What is the role of bacteria in the nitrogen fixation process?

• They convert nitrate to nitrogen gas.

• They convert nitrogen gas into usable forms like ammonia.

• They convert ammonia into nitrate.

• They release nitrogen gas into the atmosphere.

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DOK Level 2: Skill/Concept

Which of the following is a consequence of excessive nitrogen from fertilizers entering aquatic ecosystems?

• Increased production of oxygen through photosynthesis

• Decreased water temperature

• Increased growth of algae and aquatic plants

• Reduced nitrogen fixation by bacteria

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DOK Level 2: Skill/Concept

What is the final product of nitrification that plants typically absorb from the soil?

• Ammonia

• Nitrite

• Nitrate

• Nitrogen gas

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DOK Level 2: Skill/Concept

• Ammonia

• Nitrogen gas

• Nitrite

• Amino acids

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DOK Level 2: Skill/Concept

Which step in the nitrogen cycle is primarily carried out by soil bacteria and certain other microorganisms?

• Nitrogen fixation

• Nitrification

• Denitrification

• Ammonification

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DOK Level 2: Skill/Concept

How does human activity such as burning fossil fuels impact the nitrogen cycle?

• It decreases the amount of nitrogen in the atmosphere.

• It increases the deposition of nitrogen in terrestrial ecosystems.

• It reduces the need for nitrogen-fixing bacteria.

• It enhances the natural process of nitrification.

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DOK Level 2: Skill/Concept

What is the primary role of nitrogen in ecosystems?

• It acts as a primary source of energy for producers.

• It helps in the formation of proteins and nucleic acids in organisms.

• It regulates water cycles within the ecosystem.

• It provides resistance against pests and diseases in plants.

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DOK Level 2: Skill/Concept

• Nitrogen fixation

• Nitrification

• Denitrification

• Ammonification

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DOK Level 2: Skill/Concept