In some plants , pollen release and stigma receptivity are not synchronized . Stigma becomes receptive much before the release of pollen. This is known as :

Options

A. Protoandry
B. Protogyny
C. Homogamy
D. Herkogamy

Answer

To solve the question regarding the synchronization of pollen release and stigma receptivity in plants, we need to analyze the terms provided in the options.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Protoandry**: This is a condition where the male reproductive part (anther) matures before the female reproductive part (pistil). This helps in preventing self-fertilization by ensuring that pollen is released before the stigma is receptive.
- **Protogyny**: This is the opposite of protoandry. In this condition, the pistil matures before the anther, again to prevent self-fertilization.
- **Homogamy**: This condition occurs when both male and female reproductive organs mature at the same time, allowing for self-fertilization.
- **Hercogamy**: This refers to a condition in flowers that promotes cross-pollination by spatially separating the male and female parts.

2. **Analyzing the Question**:
- The question states that the stigma becomes receptive much before the release of pollen. This indicates that the female part (stigma) is ready to receive pollen before the male part (anther) is ready to release it.

3. **Identifying the Correct Answer**:
- Given that the stigma is receptive before pollen is released, this aligns with the definition of **Protogyny**. In protogyny, the female part matures first, allowing for cross-pollination and preventing self-fertilization.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Protogyny**.

### Final Answer:
**Protogyny**