Assertion : Pollen tube shows apical growth.
Reason : Growth of pollen tube is controlled by generative nucleus

Options

A. A
B. B
C. C
D. D

Answer

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that "Pollen tube shows apical growth."
- **Explanation**: Apical growth refers to growth that occurs at the tip or apex of a structure. In the case of the pollen tube, this is indeed true as the pollen tube elongates from its tip as it grows towards the ovule.

2. **Understanding the Reason**: The reason provided is "Growth of pollen tube is controlled by generative nucleus."
- **Explanation**: The generative nucleus is part of the pollen grain, but it does not control the growth of the pollen tube. Instead, the vegetative nucleus is responsible for this growth. The vegetative cell is the one that develops into the pollen tube and facilitates its elongation.

3. **Evaluating the Truth of Assertion and Reason**:
- The assertion is **true** because the pollen tube does exhibit apical growth.
- The reason is **false** because the growth of the pollen tube is controlled by the vegetative nucleus, not the generative nucleus.

4. **Conclusion**: Since the assertion is true and the reason is false, the correct option is:
- **Option C**: Assertion is correct, reason is wrong.