Select the incorrect statement from the following.

Options

A. Rhizobium multiply and colonises the surroundings of roots and gets attached to epidermal and root hair cell.
B. Successful infection of the root hair causes it to curl .
C. The nodule establishes a direct Vascular connection with the host .
D. Infection thread carries the bacteria to xylem and phloem .

Answer

To solve the question of selecting the incorrect statement regarding Rhizobium and its relationship with leguminous plants, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Rhizobium multiply and colonize the surrounding of roots and gets attached to epidermal and root hair cells."
- **Explanation**: Rhizobium is indeed a symbiotic nitrogen-fixing bacterium that attaches to the root hairs of leguminous plants. This statement is correct.

2. **Statement 2**: "Successful infection of the root hair cell causes it to curl."
- **Explanation**: When Rhizobium infects the root hair, it causes the root hair to curl, allowing the bacteria to enter. This statement is also correct.

3. **Statement 3**: "The nodule establishes a direct vascular connection with the host."
- **Explanation**: After the infection, the bacteria form nodules that connect with the plant's vascular system for nutrient exchange. This statement is correct.

4. **Statement 4**: "Infection thread carries the bacteria to xylem and phloem."
- **Explanation**: The infection thread primarily carries the bacteria to the inner cortex of the root, not directly to the xylem and phloem. This statement is incorrect.

### Conclusion:
The incorrect statement is **Statement 4**: "Infection thread carries the bacteria to xylem and phloem."