What is the role of these bacteria in the nitrogen cycle?

to absorb nitrogen-containing compounds from the soil

to release free nitrogen into the atmosphere

to break down nitrogen-containing compounds in dead

organisms

to convert free nitrogen into usable nitrogen

The role of these bacteria in the nitrogen cycle is to convert free nitrogen into usable nitrogen.

Option D

Explanation:

Bacteria plays a vital role in the conversion of free nitrogen into biologically available forms. The Nitrogen cycle is the biochemical cycle which involves bacteria. The Nitrogen fixing bacteria are either free living or symbiotic.

Nitrogen is found in different forms in the earth’s surface. 78% of the earth atmosphere contains Nitrogen gas. These gases are Inert and hence the bacteria act upon it to produce simpler form of usable Nitrogen through the Nitrogen cycle.

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.