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A nitrogen fixing bacteria is :...

A nitrogen fixing bacteria is :

A

Azotobacter

B

E.coli

C

Bacillus anthracis

D

Vibrio cholerae

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understand the Question**: The question asks for a nitrogen-fixing bacterium from the given options. 2. **Analyze the Options**: - **Option A: Azotobacter**: This is a gram-negative, aerobic, free-living bacterium found in soil. It plays a significant role in nitrogen fixation by converting atmospheric nitrogen into ammonium ions, which plants can use. - **Option B: E. coli**: This is also a gram-negative bacterium, primarily found in the intestines of humans and animals. While it is beneficial for vitamin K2 production, it does not fix nitrogen. - **Option C: Bacillus anthracis**: This is a gram-positive bacterium known for causing anthrax. It does not play a role in nitrogen fixation. - **Option D: Vibrio cholerae**: This gram-negative, comma-shaped bacterium is known for causing cholera. It is also not involved in nitrogen fixation. 3. **Identify the Correct Answer**: After analyzing all the options, Azotobacter is the only bacterium that is known for its nitrogen-fixing abilities. 4. **Conclusion**: Therefore, the correct answer to the question "A nitrogen-fixing bacteria is:" is **Azotobacter**. ---
**Step-by-Step Solution:** 1. **Understand the Question**: The question asks for a nitrogen-fixing bacterium from the given options. 2. **Analyze the Options**: - **Option A: Azotobacter**: This is a gram-negative, aerobic, free-living bacterium found in soil. It plays a significant role in nitrogen fixation by converting atmospheric nitrogen into ammonium ions, which plants can use. - **Option B: E. coli**: This is also a gram-negative bacterium, primarily found in the intestines of humans and animals. While it is beneficial for vitamin K2 production, it does not fix nitrogen. - **Option C: Bacillus anthracis**: This is a gram-positive bacterium known for causing anthrax. It does not play a role in nitrogen fixation. ...
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