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

To answer the question "If the wrong type of pollen lands on stigma, pistil rejects the pollen by," we can break down the process as follows:

### Step-by-Step Solution:

1. **Understanding Pollination**: Pollination is the transfer of pollen from the male part of a flower (anther) to the female part (stigma). However, not all pollen is compatible with every stigma.

2. **Recognition of Pollen Type**: The pistil has the ability to recognize whether the pollen is of the correct type (compatible) or the wrong type (incompatible). This recognition is crucial for successful fertilization.

3. **Rejection of Incompatible Pollen**: When incompatible pollen lands on the stigma, the pistil identifies it as the wrong type. This leads to a rejection process.

4. **Prevention of Germination**: The primary mechanism of rejection is that the pistil prevents the germination of the incompatible pollen on the stigma. This means that the pollen does not start to grow or develop.

5. **Inhibition of Pollen Tube Growth**: Since the pollen does not germinate, there is no formation of a pollen tube. The growth of the pollen tube in the style is inhibited, preventing any further interaction with the ovule.

6. **Conclusion**: The pistil effectively prevents both the germination of the incompatible pollen and the growth of the pollen tube. Therefore, the correct answer to the question is that the pistil rejects the pollen by preventing germination and inhibiting pollen tube growth.

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