Exploring the Nitrogen Cycle and Its Impact on Life

Why is nitrogen important for living organisms?

• It is a primary component of water.

• It is essential for the formation of DNA and proteins.

• It provides energy for cellular processes.

• It is the main component of cell membranes.

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What percentage of the Earth's atmosphere is composed of nitrogen?

• 21%

• 78%

• 50%

• 33%

Which of the following is NOT a step in the nitrogen cycle?

• Fixation

• Nitrification

• Denitrification

• Photosynthesis

How does lightning contribute to the nitrogen cycle?

• By converting nitrogen gas into oxygen.

• By breaking the triple bond of nitrogen gas, allowing it to form compounds.

• By releasing nitrogen gas into the atmosphere.

• By fixing nitrogen directly into plant roots.

What role do Rhizobium bacteria play in the nitrogen cycle?

• They release nitrogen gas into the atmosphere.

• They decompose dead plant matter.

• They convert nitrates back into nitrogen gas.

• They fix nitrogen gas into usable compounds in the soil.

Where do Rhizobium bacteria live?

• In the leaves of plants.

• In the flowers of plants.

• In the root systems of legumes.

• In the stems of trees.

What is the final stage of the nitrogen cycle?

• Denitrification

• Fixation

• Nitrification

• Assimilation

What happens to nitrogen atoms during decomposition?

• They are converted into oxygen.

• They are released as nitrogen gas into the atmosphere.

• They are fixed into plant roots.

• They are converted into ammonia.

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Which organisms act as decomposers in the nitrogen cycle?

• Lightning

• Certain fungi and bacteria

• Legumes

• Rhizobium bacteria

What is the result of the denitrification process?

• Formation of ammonia

• Release of nitrogen gas into the atmosphere

• Creation of nitrates

• Fixation of nitrogen into plant roots

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