A red pigment found in root nodules of legume plant is

Options

A. Phyco erythrin
B. Bacterio chlorophyl
C. Leg-haemoglobin
D. Bacterio viridin

Answer

To solve the question regarding the red pigment found in root nodules of legume plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question is asking about a specific red pigment associated with root nodules of legume plants. This requires knowledge of the biological processes occurring in these nodules.

2. **Identify the Role of Root Nodules**: Root nodules in legume plants are primarily involved in nitrogen fixation. They house symbiotic bacteria, particularly Rhizobium, which help convert atmospheric nitrogen into a form usable by plants.

3. **Recognize the Importance of Oxygen Regulation**: The nitrogenase enzyme, which is crucial for nitrogen fixation, is sensitive to oxygen. Therefore, there must be a mechanism to protect this enzyme from oxygen exposure.

4. **Identify the Pigment**: The pigment that plays a role in protecting the nitrogenase enzyme from oxygen is called leghemoglobin. This pigment is red in color and is specifically found in the root nodules of legume plants.

5. **Eliminate Incorrect Options**:
- **Phycoerythrin**: This pigment is found in red algae, not in legumes.
- **Bacteriochlorophyll**: This is associated with photosynthetic bacteria, not legumes.
- **Bacterioviridin**: This is also not relevant to legumes.

6. **Conclusion**: Based on the above analysis, the correct answer to the question is leghemoglobin, which is the red pigment found in the root nodules of legume plants.

### Final Answer:
The red pigment found in root nodules of legume plants is **leghemoglobin**.