Leghaemoglobin takes part in

Options

A. Energy release
B. Stimulating growth of Rhizobium
C. `N_(2)` absorption
D. Protecting nitrogenase from `O_(2)`

Answer

**Step-by-Step Solution:**

1. **Understanding Leghaemoglobin:**
- Leghaemoglobin is a red pigment found in leguminous plants, specifically in their root nodules. It is responsible for the red or pink color of these nodules.

2. **Function of Leghaemoglobin:**
- The primary function of leghaemoglobin is to bind with oxygen. It has a high affinity for oxygen, which allows it to effectively capture and transport oxygen within the plant.

3. **Role in Nitrogen Fixation:**
- In leguminous plants, leghaemoglobin is associated with the symbiotic relationship between the plant and nitrogen-fixing bacteria, such as Rhizobium. These bacteria reside in the root nodules and are crucial for converting atmospheric nitrogen into a form that the plant can use.

4. **Anaerobic Conditions:**
- The nitrogen-fixing bacteria require anaerobic conditions to function optimally. Leghaemoglobin helps maintain these conditions by scavenging excess oxygen, thus protecting the nitrogenase enzyme from being inhibited by oxygen.

5. **Conclusion:**
- Based on the functions discussed, the correct answer to the question "Leghaemoglobin takes part in" is that it protects nitrogenase from oxygen.

**Final Answer:**
Leghaemoglobin takes part in protecting nitrogenase from oxygen.

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