The ability of the pistil to recognize the pollen is the result of a continuous dialogue This dialogue is mediated 

Options

A. by chemical components of the pollen cytoplasm with those of the pistil
B. by chemical components of the pollen wall with those of the pistil
C. by chemical components of the pollen wall interacting with those of the style
D. by sporopollenin of the pollen wall interacting with those of the pistil

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the mechanism through which the pistil recognizes pollen grains, emphasizing that this recognition is a result of a continuous dialogue mediated by some interactions.

2. **Identifying Key Terms**:
- **Pistil**: The female reproductive part of a flower, which includes the stigma, style, and ovary.
- **Pollen**: The male gametophyte that contains the male gametes (sperm cells).
- **Recognition**: The ability of the pistil to identify compatible pollen grains.

3. **Pollen-Pistil Interaction**:
- When pollen grains land on the stigma of the pistil, a recognition process occurs.
- This interaction is crucial for ensuring that only pollen from the same species can fertilize the ovules.

4. **Chemical Mediators**:
- The recognition is mediated by specific chemical interactions between the surface components of the pollen wall and the stigma.
- The stigma has specific receptors that can identify compatible pollen based on these chemical signals.

5. **Correct Option Identification**:
- The correct answer to the question is that the recognition is mediated by the chemical components of the pollen wall interacting with those of the pistil.
- This means that the surface chemistry of the pollen grain and the stigma plays a crucial role in the recognition process.

6. **Eliminating Incorrect Options**:
- The option stating that the interaction is due to the pollen cytoplasm is incorrect because the cytoplasm does not play a role in the surface recognition process.
- The option mentioning the interaction with the style is also less accurate since the primary interaction occurs at the stigma.

### Final Answer:
The ability of the pistil to recognize the pollen is mediated by the chemical components of the pollen wall interacting with those of the pistil.

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