Question

The product(s) of reaction catalyzed by nitrogenase in root nodules of a leguminous plant is

• A. Ammonia and oxygen
• B. Ammonia and hydrogen
• C. Ammonia alone
• D. Nitrate alone

Answer 1

The correct option is B

Ammonia and hydrogen

The correct option is B.

Explanation for the correct option:

1. Certain bacteria or prokaryotes are capable of converting atmospheric nitrogen to ammonia.
2. This process is generally called biological nitrogen fixation.
3. The enzyme nitrogenase transforms atmospheric nitrogen into ammonia and hydrogen gas in the soil during the nitrogen fixation process.
4. Nitrogen-fixing bacteria may be free-living or symbiotic.
5. Some of the free-living nitrogen fixers are Azotobacter, Beijernickia, Rhodospirillum, cyanobacteria, etc.

Explanation for the incorrect options:

Option A:

1. A nitrogen-and-hydrogen-based gas.
2. It irritates the skin, eyes, nose, throat, and lungs and has a pungent stench.
3. Bacteria and decomposing plants and animals produce ammonia, which can be found in water, soil, and air.
4. When proteins are broken down, the body produces ammonia.
5. Respiration and energy release both require oxygen.
6. Breathing provides oxygen to the body.

Option C:

1. Ammonia is a nitrogen-hydrogen chemical with the formula NH3.

Option D:

1. Plants require nitrates in order to make protein, which is required for growth.
2. Nitrates can be acquired by the plant through active uptake/transport by root Hair cells.

Final answer: The product(s) of reaction catalyzed by nitrogenase in root nodules of a leguminous plant is ammonia and hydrogen.