in spring (rainy summer) the activity of vascular cambium is

Options

A. more
B. less
C. normal
D. none of the above.

Answer

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- Vascular cambium is a type of lateral meristem that is responsible for the secondary growth in plants. It produces secondary xylem (wood) and secondary phloem.

2. **Seasonal Influence on Vascular Cambium**:
- The activity of vascular cambium is influenced by seasonal changes. In temperate regions, there are distinct seasons that affect plant growth.

3. **Spring Conditions**:
- During spring (or rainy summer), conditions are generally favorable for plant growth. This includes increased moisture and warmer temperatures.

4. **Increased Activity**:
- Due to these favorable conditions in spring, the vascular cambium becomes highly active. It produces a large amount of secondary xylem, which is referred to as spring wood or early wood.

5. **Autumn Conditions**:
- In contrast, during autumn, the conditions become less favorable (cooler temperatures, reduced moisture), leading to decreased activity of the vascular cambium. This results in the formation of less secondary xylem, known as autumn wood or late wood.

6. **Conclusion**:
- Therefore, in spring (rainy summer), the activity of vascular cambium is more compared to other seasons, particularly autumn.

### Final Answer:
In spring (rainy summer), the activity of vascular cambium is **more**.

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