Which pigment gives a pinkish hue to rhizobium induced root nodules.

Options

A. Leghaemoglobin
B. Carotenoid
C. Mauveine
D. None of the above

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the pigment responsible for the pinkish hue in root nodules induced by Rhizobium bacteria.

2. **Identifying the Options**: The options provided are:
- A) Leg hemoglobin
- B) Carotenoid
- C) Mauveine
- D) None of these

3. **Analyzing the Options**:
- **Leg hemoglobin**: This is a type of hemoprotein found in leguminous plants. It is known to give a pinkish color to the root nodules formed due to the symbiotic relationship between legumes and Rhizobium bacteria.
- **Carotenoid**: These are pigments found in plants that typically produce yellow, orange, or red colors, but they are not responsible for the pinkish hue in root nodules.
- **Mauveine**: This is a synthetic dye and not related to the pigmentation in root nodules.
- **None of these**: This option implies that none of the listed pigments are correct, which is not the case here.

4. **Conclusion**: Based on the analysis, the correct answer is **A) Leg hemoglobin**, as it is the pigment that imparts a pinkish hue to the root nodules induced by Rhizobium.

5. **Explanation of Leg Hemoglobin**: Leg hemoglobin is similar in structure and function to myoglobin found in animals. It plays a crucial role in the nitrogen fixation process within the root nodules of leguminous plants, facilitating the exchange of gases and protecting the nitrogen-fixing bacteria.