If wrong type of pollen lands on stigma, pistil rejects the pollen by

Options

A. Preventing pollen germination on stigma
B. Inhibiting mitosis in generative cell
C. Inhibiting pollen tube growth in style
D. More than one option is correct

Answer

**Step-by-Step Solution:**

1. **Understanding the Context**: The question asks about the rejection of pollen by the pistil when the wrong type of pollen lands on the stigma. The pistil is the female reproductive part of the flower, which includes the stigma, style, and ovary.

2. **Identifying Pollen Compatibility**: Pollen grains are specific to certain plants. When pollen from a different species or incompatible type lands on the stigma, the pistil recognizes it as "wrong" or incompatible.

3. **Mechanism of Rejection**: The pistil has mechanisms to reject incompatible pollen. This includes:
- **Preventing Pollen Germination**: The pistil does not allow the pollen to germinate on the stigma, which is the first step in the fertilization process.
- **Inhibiting Pollen Tube Growth**: If the pollen does manage to begin germination, the pistil will inhibit the growth of the pollen tube through the style, preventing it from reaching the ovule.

4. **Evaluating Options**:
- **Preventing Pollen Germination on Stigma**: This is correct as the pistil prevents the germination of incompatible pollen.
- **Inhibiting Mitosis in Generative Cells**: This is incorrect because the rejection process does not involve mitosis in generative cells.
- **Inhibiting Pollen Tube Growth in Style**: This is also correct as the pistil prevents the growth of the pollen tube if the pollen is incompatible.
- **More than One Option is Correct**: Since both the first and third options are correct, this option is also valid.

5. **Conclusion**: The correct answer to the question is that the pistil rejects the pollen by preventing pollen germination on the stigma and inhibiting pollen tube growth in the style. Therefore, the final answer is that more than one option is correct.

**Final Answer**: The pistil rejects the wrong type of pollen by preventing pollen germination on the stigma and inhibiting pollen tube growth in the style. Thus, the correct option is "more than one option is correct."

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