Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Nitrogen fixation converts:

a. atmospheric molecular nitrogen to ammonia.

b. nitrates to nitrites.

c. ammonia to molecular nitrogen.

d. ammonia to nitrates.

e. nitrites to nitrates.

Summary Introduction


Nitrogen cycle is a biogeochemical cycle that transports nitrogen from the atmosphere to soil, marine ecosystem, and organisms. It involves three main processes, namely nitrogen fixation, ammonification, and nitrification.


Justification/explanation for the correct answer:

Option (a) states that “nitrogen fixation converts atmospheric molecular nitrogen to ammonia.” This is correct because, in nitrogen fixation, certain bacteria fix molecular nitrogen present in the air by converting it to ammonia and ammonium ions. Plants use this fixed nitrogen for their cellular functions. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) states that “nitrogen fixation converts nitrates to nitrites.” This is incorrect because, in nitrogen fixation, the atmospheric form of nitrogen, that is, molecular nitrogen gas is converted to a form that can be used by plants. So, it is an incorrect option.

Option (c) states that “nitrogen fixation converts ammonia to molecular nitrogen...

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