Identify the role of lectins in formation of root nodules in legumes.

Options

A. Formation of shepherd crook
B. Recognition of compatible Rhizobium by host
C. Formation of peribacterial membrane
D. Formation of inection thrread

Answer

### Step-by-Step Solution:

1. **Understanding Lectins**:
- Lectins are proteins that specifically bind carbohydrates. They play a crucial role in various biological processes, including plant defense mechanisms and symbiotic relationships.

2. **Role in Plant Defense**:
- Lectins participate in plant defense against predators and pathogens, such as fungi and viruses. This protective function is essential for the survival of plants in their natural environments.

3. **Involvement in Symbiotic Interactions**:
- Lectins are also involved in symbiotic interactions, particularly between host plants and beneficial microbes. These interactions are crucial for nutrient exchange and overall plant health.

4. **Specific Microbes**:
- In legumes, the key symbiotic microbes include mycorrhizal fungi and nitrogen-fixing bacteria known as rhizobia. These microbes form associations with the plant roots, leading to the formation of root nodules.

5. **Recognition of Rhizobia**:
- One of the primary roles of lectins in the formation of root nodules is to recognize compatible rhizobia. This recognition is essential for the establishment of a successful symbiotic relationship, allowing the plant to benefit from nitrogen fixation.

6. **Conclusion**:
- Therefore, the role of lectins in the formation of root nodules in legumes is primarily to recognize compatible rhizobia, facilitating the symbiotic relationship that leads to the development of root nodules.

### Final Answer:
The role of lectins in the formation of root nodules in legumes is to recognize compatible rhizobia through the host plant.

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