How Is Atmospheric Nitrogen Converted to a Usable Form in the Biosphere

question 47

Multiple Choice

How is atmospheric nitrogen converted to a usable form in the biosphere?

• A) Atmospheric nitrogen is directly available to plants and animals.
• B) It is absorbed into plants via stomata and converted within the plant to a usable form.
• C) Bacteria within root nodules of legumes chemically combine the atmospheric nitrogen into nitrates and ammonia.
• D) Atmospheric nitrogen is completely unavailable to plants and animals and, as a result, synthetic fertilizers must be used.

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