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Chapter 46: Q23 (page 1369)

The process whereby nitrogen is brought into organic molecules is called ________. a. nitrification b. denitrification c. nitrogen fixation d. nitrogen cycling

Short Answer

Expert verified

The correct option is c. nitrogen fixation .

Step by step solution

01

Step 1. Given information

Plants and phytoplankton are not equipped to incorporate nitrogen from the atmosphere (which exists as tightly bonded, triple covalent N2 ) even though this molecule comprises approximately 78 percent of the atmosphere.

02

Step 2. Explanation

The correct option is c. nitrogen fixation .

Nitrogen enters the living world via free-living and symbiotic bacteria, which incorporate nitrogen into their macromolecules through nitrogen fixation (conversion of N2 ). Cyanobacteria live in most aquatic ecosystems where sunlight is present; they play a key role in nitrogen fixation.

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