Question

Which of the following cycles need a nutrient to be fixed prior to use by producers and consumers? *

Carbon

Nitrogen

Oxygen

All of the above

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Answer 1

Answer:

The nitrogen cycle.

Nitrogen cycle because they are fixed by certain rhizobium, azotobacter and blue-green algae. These fix nitrogen in the soil but not in the form plants want. So they are modified by other bacteria and then used by plants. As for rhizobium, they are present in leguminous plants which enrich the soil by themselves.

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