Role of Bacteria in the Nitrogen Cycle

Medium Biology Microbiology

In a laboratory setting, researchers are studying the role of specific bacteria in the nitrogen cycle, particularly focusing on the genus Rhizobium. Members of this genus are known for their symbiotic relationship with leguminous plants, where they form nodules on the roots of these plants. This interaction allows the bacteria to fix atmospheric nitrogen into a form that is usable by the plant.

Another group of bacteria, known as the nitrifying bacteria, also plays a role in the nitrogen cycle. They convert ammonia into nitrites and then into nitrates, which are taken up by plants.

Based on the information provided about Rhizobium and other nitrifying bacteria, which of the following statements regarding the nitrogen cycle and microbial activity is accurate?

Only Rhizobium is responsible for fixing nitrogen in the soil.

Nitrifying bacteria convert nitrates back into atmospheric nitrogen.

Rhizobium promotes plant growth by fixing nitrogen through a process that directly benefits other soil bacteria.

Both Rhizobium and nitrifying bacteria play important roles in the nitrogen cycle, but their functions are distinct.

Hint

Submitted12.0K

Correct6.5K

% Correct55%