Question

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Answer 1

Answer:

See in the explanation. Please mark as brilliant.

Explanation:

1.) The nitrogen cycle is a repeating cycle of processes during which nitrogen moves through both living and non-living things: the atmosphere, soil, water, plants, animals and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms.

2.) In the given nitrogen cycle, P - Ammonia, Q - Nitrites.

3.) In the given nitrogen cycle, R - Nitrates.

4.) Nitrogen Fixation. It is a process by which atmospheric nitrogen is converted into the form which can be easily absorbed the organisms on earth.

Nitrogen Fixation by Free-Living Heterotrophs

Many heterotrophic bacteria live in the soil and fix significant levels of nitrogen without the direct interaction with other organisms. Examples of this type of nitrogen-fixing bacteria include species of Azotobacter, Bacillus, Clostridium, and Klebsiella.