Select the correct statement w.r.t denitrification

Options

A. is performed by autotrophs
B. Is a process of oxidation
C. Is favoured by anaerobic condition
D. Has no role in nitrogen cycle

Answer

### Step-by-Step Solution:

1. **Understanding Denitrification**: Denitrification is the process through which nitrate ions (NO3-) present in the soil are reduced to nitrogen gas (N2) and released into the atmosphere. This is an essential part of the nitrogen cycle.

2. **Identifying the Key Players**: The process is primarily carried out by denitrifying bacteria, such as *Pseudomonas* and *Thiobacillus*. These microorganisms are crucial for the conversion of nitrates back to nitrogen gas.

3. **Conditions Favoring Denitrification**: Denitrification occurs under anaerobic conditions, meaning it takes place in environments with little or no oxygen. This is important because denitrifying bacteria thrive in such conditions.

4. **Role in the Nitrogen Cycle**: Denitrification plays a significant role in the nitrogen cycle by converting nitrates back into nitrogen gas, thus completing the cycle. This process helps maintain the balance of nitrogen in the ecosystem.

5. **Evaluating the Statements**:
- **Is performed by autotrophs**: This statement is incorrect. Denitrification is performed by heterotrophic bacteria, not autotrophs.
- **Is a process of oxidation**: This statement is also incorrect. Denitrification involves the reduction of nitrates, not oxidation.
- **Is favored by anaerobic condition**: This statement is correct. Denitrification requires anaerobic conditions to occur.
- **Has no role in nitrogen cycle**: This statement is incorrect. Denitrification is a crucial part of the nitrogen cycle.

6. **Conclusion**: The correct statement regarding denitrification is that it is favored by anaerobic conditions.

### Final Answer:
The correct statement with respect to denitrification is: **It is favored by anaerobic condition.**

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