Name the pigment found in root nodules of leguminous plants.

Explanation

**Step-by-Step Solution:**

1. **Identify the Context**: The question asks for a specific pigment found in the root nodules of leguminous plants. Understanding that leguminous plants are those that belong to the family Fabaceae, which includes beans, peas, and lentils, is essential.

2. **Recall the Function of Root Nodules**: Root nodules are specialized structures formed in the roots of leguminous plants where nitrogen-fixing bacteria, such as Rhizobium, reside. These bacteria convert atmospheric nitrogen into a form that plants can use.

3. **Identify the Pigment**: The pigment associated with these root nodules is known as leghemoglobin. This pigment is similar to hemoglobin found in blood and is responsible for the red color of the nodules.

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