Question

which process converts atmospheric nitrogen into forms usable by plants?
a. nitrogen fixation
b. assimilation
c. ammonification
d. denitrification
what is the primary function of the nitrogen cycle?
a. to maintain the availability of nitrogen in ecosystems by converting nitrogen between different chemical forms
b. to convert nitrogen into oxygen for respiration
c. to store nitrogen in the atmosphere indefinitely
d. to decompose organic matter into nitrogen gas
what is ammonification in the nitrogen cycle?
a. the uptake of nitrogen by plants
b. the conversion of ammonia into nitrate
c. the breakdown of organic matter by decomposers, releasing ammonia back into the soil
d. the process of converting nitrogen gas into ammonia

Explanation:

1. Nitrogen fixation is the process that converts atmospheric nitrogen into forms usable by plants, like ammonia or nitrate.
2. The primary function of the nitrogen - cycle is to maintain the availability of nitrogen in ecosystems by converting nitrogen between different chemical forms.
3. Ammonification in the nitrogen - cycle is the breakdown of organic matter by decomposers, releasing ammonia back into the soil.

Answer:

1. a. Nitrogen Fixation
2. a. To maintain the availability of nitrogen in ecosystems by converting nitrogen between different chemical forms
3. c. The breakdown of organic matter by decomposers, releasing ammonia back into the soil