Question

Rhizobium is an important _______bacteria.

• A. Nitrogen fixing
• B. Nitrifying
• C. Denitrifying
• D. Ammonifying

Answer 1

The correct option is A

Nitrogen fixing

The correct option is option A

The explanation for the correct option:

1. Rhizobium is bacteria that live in a symbiotic relationship with leguminous plant root nodules.
2. Nitrogen fixation is not possible on its own.
3. Rhizobium requires a plant host for this reason.
4. Rhizobium is an important supplier of nitrogen for agricultural soils, especially in arid areas.

The explanation for the incorrect option:

Option B:

1. Nitrifying Bacteria are a tiny group of aerobic bacteria that get their energy from inorganic compounds.
2. They are bacteria that play a crucial role in the nitrogen cycle by converting soil ammonia to nitrates, which plants may use.

Option C:

1. Denitrifying bacteria are microorganisms that convert nitrates in the soil to free nitrogen in the atmosphere, depleting soil fertility and lowering agricultural production.

Option D:

1. Ammonifying bacteria are microorganisms that convert ammonia to nitrogen in the atmosphere.
2. They might be mutualistic or antagonistic.
3. Symbiotic ammonifying bacteria develop root nodules and provide the plant with ammonia or ammonium.

Final answer: Rhizobium is an important nitrogen fixing bacteria.