Assertion: Fascicular vascular cambium, interfascicular cumbium and cork-cambium are examples of lateral miristems.
Reson: These are responsible for producing the secondary tissues.

Options

A. If both assertion and reason are true and reason is the correct explanantion of assertion
B. if both assertion and reason are true but reason is not the correct explanation of assertion.
C. if assertion is true but reason is false.
D. if both assertion and reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that fascicular vascular cambium, interfascicular cambium, and cork cambium are examples of lateral meristems.
- Lateral meristems are responsible for secondary growth in plants, which increases the girth or width of the plant.

2. **Evaluating the Assertion**:
- Fascicular vascular cambium is found between the xylem and phloem in vascular bundles, while interfascicular cambium is located between vascular bundles. Cork cambium is responsible for producing the outer protective layer of the plant.
- All these types of cambium contribute to the secondary growth of the plant, confirming that the assertion is true.

3. **Understanding the Reason**:
- The reason given is that these cambiums are responsible for producing secondary tissues.
- Secondary tissues include secondary xylem (wood) and secondary phloem, which are produced by the activity of the cambium.

4. **Evaluating the Reason**:
- The reason is also true because the cambium indeed plays a crucial role in producing secondary tissues, which contribute to the plant's growth in girth.

5. **Determining the Relationship**:
- While both the assertion and reason are true, the reason does not correctly explain the assertion. The assertion identifies the types of cambium as lateral meristems, while the reason explains their function in producing secondary tissues.

6. **Conclusion**:
- Therefore, the correct answer is that both the assertion and reason are true, but the reason is not the correct explanation of the assertion. This aligns with option 2.