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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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Most popular questions from this chapter

Which of the following approaches would be the most effective way to reduce greenhouse carbon dioxide?

a. Increase waste deposition into the deep ocean.

b. Plant more environmentally-suitable plants.

c. Increase use of fuel sources that do not produce carbon dioxide as a by-product.

d. Decrease livestock agriculture

In the English Channel ecosystem, the number of primary producers is smaller than the number of primary consumers because

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Compare the three types of ecological pyramids and how

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Which of the following statements about the nitrogen cycle is false?

a. Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4 + ).

b. Denitrification by bacteria converts nitrates (NO3 鈭� ) to nitrogen gas (N2 ).

c. Nitrification by bacteria converts nitrates (NO3 鈭� ) to nitrites (NO2 鈭� ).

d. Nitrogen fixing bacteria convert nitrogen gas (N2 ) into organic compounds.

How would loss of fungi in a forest effect biogeochemical cycles in the area? a. Nitrogen could no longer be fixed into organic molecules.

b. Phosphorus stores would be released for use by other organisms.

c. Sulfur release from eroding rocks would cease.

d. Carbon would accumulate in dead organic matter and waste.
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