Root nodules with Rhizobium and without leghaemoglobin are found in

Options

A. Glycine
B. Parasponia
C. Alnus
D. Gunnera

Answer

To answer the question regarding which plant has root nodules with Rhizobium but without leghaemoglobin, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Leghaemoglobin**:
- Leghaemoglobin is a red pigment found in the root nodules of certain plants, particularly legumes. Its primary function is to regulate oxygen supply to the nitrogen-fixing bacteria (Rhizobium) present in the nodules.

2. **Identify the Plants Mentioned**:
- The plants listed in the question are: Absinthia, Glycine, Parasponia, Alnus, and Gunera.

3. **Analyze Each Plant**:
- **Absinthia**: This plant is not commonly associated with Rhizobium nodules.
- **Glycine**: This is a legume and typically has leghaemoglobin in its root nodules.
- **Parasponia**: This is a unique case as it is known to have root nodules with Rhizobium but does not contain leghaemoglobin.
- **Alnus**: This is a genus of alder trees that also have root nodules, but they usually contain leghaemoglobin.
- **Gunera**: This plant is not typically associated with Rhizobium nodules.

4. **Conclusion**:
- Based on the analysis, the only plant that has root nodules with Rhizobium and does not contain leghaemoglobin is **Parasponia**.

### Final Answer:
- The correct answer is **Parasponia**.

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