Which of the following energy sources is associated with nitrogen emissions?
a. biomass
b. wind
c. solar
d. geothermal

a. biomass

Biomass can be defined as organic matter that is available in an organism as a source of energy. Biomass is related with the nitrogen emission as biomass can be available as fuel or dead organic matter the decomposition and burning of which results in the emission of nitrogen in the form of nitrogen dioxide, and other nitrous oxides.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.