The ability of the pistil to recognise the pollen followed by its acceptacne or rejection is the result of a continuous dialogue between pollen grain and the pistil.
The diaglogue is mediated by chemical components of the pollen interacting with those of the pistil. Which of the following chemicals mainly takes part in the interaction

Options

A. Nucleotides
B. Proteins
C. Minerals
D. Lipid or inulin

Answer

To solve the question regarding the chemical components involved in the interaction between pollen grains and the pistil, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components**:
- The pistil is the female reproductive part of the flower, consisting of the stigma, style, and ovary. The interaction between pollen and the pistil is crucial for fertilization.

2. **Recognizing the Interaction**:
- When pollen grains land on the stigma, a chemical dialogue occurs. This interaction is essential for the acceptance or rejection of the pollen grain by the pistil.

3. **Identifying the Chemicals Involved**:
- The chemical components involved in this interaction are secreted by the pollen grains and recognized by the stigma.

4. **Evaluating the Options**:
- The options provided are:
- A) Nucleotides
- B) Proteins
- C) Minerals
- D) Lipids or Inulin

5. **Analyzing Each Option**:
- **Nucleotides**: These are not primarily involved in pollen-pistil interaction.
- **Proteins**: These are secreted by the pollen grains and play a crucial role in the recognition process by the stigma. This is the correct answer.
- **Minerals**: These do not participate in the recognition process.
- **Lipids or Inulin**: These are also not involved in the pollen-pistil interaction.

6. **Conclusion**:
- Based on the analysis, the correct answer is **B) Proteins**.

### Final Answer:
The chemical that mainly takes part in the interaction between pollen grains and the pistil is **Proteins**.

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