Question

Which bacteria fix nitrogen in the soil?

• A. Nitrobacter
• B. Nitrosomonas
• C. Rhizobium
• D. Clostridium

Answer 1

The correct option is C

Rhizobium

The correct option is (c)

The explanation for the correct option is:

1. These are the groups of nitrogen-fixing bacteria.
2. They convert atmospheric nitrogen into plant usable form.
3. They are present in the root nodules of leguminous plants.

The explanation for the incorrect option is:

Option (a):

1. These bacterias help in the nitrification process.
2. They are found in the root nodules of leguminous plants.

Option (b)

1. These bacterias also help in the nitrification process.
2. They are found in the root nodules of leguminous plants.

Option (d)

1. These are the groups of nitrogen-fixing bacteria.
2. They convert atmospheric nitrogen into plant usable form.
3. They are present in the root nodules of leguminous plants.

Final Answer: Rhizobium bacteria fix nitrogen in the soil.