Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Nitrogen fixation converts _______ to _______.

  1. a. nitrogen gas; ammonia
  2. b. nitrates; nitrites
  3. c. ammonia; nitrogen gas
  4. d. ammonia; nitrates
  5. e. nitrogen gas; nitrogen oxides

Summary Introduction

Concept introduction: Air is the main reservoir for nitrogen and about 80 percent of the atmosphere is the nitrogen gas. The movement of nitrogen gas takes place among the soil, atmosphere, and water, and into and out of the food webs. Nitrogen fixation process is done by some nitrifying bacteria.


Reasons for the correct statement:

Nitrogen is present in gaseous form of nitrogen accessible only to nitrogen-fixing prokaryotes. By the process of nitrogen fixation, some bacteria like nitromonas and archaea take up N2 and incorporate it into ammonia that producers can take up and use. Ammonia is also formed by the ammonification of organic wastes and remains by bacteria and fungi.

Option a. is given as “nitrogen gas; ammonia”.

Nitrogen fixation converts nitrogen gas to ammonia. Therefore, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “nitrates; nitrites”. In nitrification process, bacteria convert ammonia to nitrates and then nitrites...

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