The root nodules formed by leguminous plants have a red pigment called

Options

A. Haemoglobin
B. Phycocyanin
C. Leghaemoglobin
D. Anthocyanin

Explanation

**Step-by-Step Solution:**

1. **Identify the Context**: The question pertains to the root nodules formed by leguminous plants, which are known to have a specific pigment.

2. **Understand the Role of the Pigment**: The root nodules are associated with symbiotic nitrogen-fixing bacteria, particularly Rhizobium, which help in converting atmospheric nitrogen into a usable form for the plant.

3. **Recognize the Pigment**: The red pigment present in the root nodules of leguminous plants is called leghaemoglobin. This pigment is crucial as it helps protect the nitrogen-fixing enzyme, nitrogenase, from being inactivated by oxygen.

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