Which of the following statements is incorrect in relation to leghaemoglobin ?

Options

A. Leghaemoglobin functions as oxygen scavenger .
B. It is synthesized by host cell.
C. It makes nodules pink coloured .
D. It oxidizes enzyme nitrogenase .

Answer

To determine which statement about leghaemoglobin is incorrect, let's analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Leghaemoglobin**:
- Leghaemoglobin is a type of hemoglobin found in the root nodules of leguminous plants. Its primary function is to carry oxygen.

2. **Function as an Oxygen Scavenger**:
- The first statement claims that leghaemoglobin functions as an oxygen scavenger. This is correct because it helps to maintain a low oxygen concentration in the root nodules, which is crucial for the functioning of the nitrogen-fixing enzyme nitrogenase.

3. **Synthesis by the Host Cell**:
- The second statement mentions that leghaemoglobin is synthesized by the host cell. This is also correct, as leghaemoglobin is produced in the root nodules of leguminous plants.

4. **Color of the Nodules**:
- The third statement states that leghaemoglobin gives the nodules a pink color. This is true; the presence of leghaemoglobin is what gives the root nodules their characteristic pink hue.

5. **Oxidation of Nitrogenase**:
- The fourth statement claims that leghaemoglobin oxidizes the enzyme nitrogenase. This is incorrect. In fact, leghaemoglobin protects nitrogenase from oxidation by maintaining a low oxygen environment, allowing nitrogenase to function effectively.

### Conclusion:
The incorrect statement in relation to leghaemoglobin is the fourth one: "It oxidizes the enzyme nitrogenase."

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