If all nitrogenase enzyme are inactivated , than there will be no

Options

A. Fixation of in legumes
B. Fixation of atmospheric nitrogen
C. Conversion from nitrate to nitrite in legumes
D. Conversion from ammonium to nitrite in soil

Answer

To solve the question "If all nitrogenase enzymes are inactivated, then there will be no?", we need to understand the role of nitrogenase enzymes in biological processes.

### Step-by-Step Solution:

1. **Understand the Role of Nitrogenase**:
- Nitrogenase is an enzyme that plays a crucial role in the process of nitrogen fixation. This process involves converting atmospheric nitrogen (N2) into ammonia (NH3), which can then be utilized by plants.

2. **Identify the Implications of Inactivation**:
- If all nitrogenase enzymes are inactivated, the process of nitrogen fixation cannot occur. This means that the conversion of atmospheric nitrogen into a usable form (ammonia) for plants will be halted.

3. **Evaluate the Options**:
- **Option 1: Fixation in legumes**: This refers to the ability of legumes to fix nitrogen through symbiotic relationships with nitrogen-fixing bacteria. If nitrogenase is inactive, legumes will not be able to fix nitrogen.
- **Option 2: Fixation of atmospheric nitrogen**: This is directly related to the function of nitrogenase. If nitrogenase is inactive, atmospheric nitrogen cannot be fixed.
- **Option 3: Conversion from nitrate to nitrite in legumes**: This process is not directly dependent on nitrogenase, so it may still occur.
- **Option 4: Conversion of ammonium to nitrate**: This process, known as nitrification, is also not directly dependent on nitrogenase.

4. **Conclusion**:
- The correct answer is **Option 1: Fixation in legumes**, because if nitrogenase enzymes are inactivated, legumes will not be able to fix nitrogen.

### Final Answer:
If all nitrogenase enzymes are inactivated, then there will be no fixation in legumes.