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Which one of following can fix nitrogen?...

Which one of following can fix nitrogen?
(a) Mycoplasma
(b) Azotobacter
(c) Anabaena
(d) Both b and c

A

Mycoplasma

B

Azotobacter

C

Anabaena

D

Both B and C.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the following organisms can fix nitrogen, we need to analyze each option provided: 1. **Mycoplasma (Option A)**: - Mycoplasma is known as the smallest bacteria and is wall-less. It is primarily associated with causing diseases in plants and animals. Mycoplasma does not have the capability to fix nitrogen. 2. **Azotobacter (Option B)**: - Azotobacter is a free-living bacterium that is well-known for its ability to fix atmospheric nitrogen. It converts nitrogen gas (N₂) from the atmosphere into ammonia (NH₃), which can then be utilized by plants. Therefore, Azotobacter is a nitrogen fixer. 3. **Anabaena (Option C)**: - Anabaena is also a free-living bacterium that can fix nitrogen. It is often found in aquatic environments and can form symbiotic relationships with certain plants. Anabaena has specialized cells called heterocysts that are involved in nitrogen fixation. Thus, Anabaena is also a nitrogen fixer. 4. **Both B and C (Option D)**: - Since both Azotobacter and Anabaena are capable of fixing nitrogen, this option is correct. Based on the analysis, the correct answer is **(d) Both B and C**.
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