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, we need to identify the term that describes the condition where the stigma of a flower becomes receptive before the pollen is released. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that in some plants, the timing of pollen release and stigma receptivity is not synchronized. Specifically, the stigma becomes receptive before the pollen is released.

2. **Identifying Key Terms**:
- **Pollen Release**: This refers to the process where pollen grains are shed from the anthers of the flower.
- **Stigma Receptivity**: This refers to the ability of the stigma to accept pollen for fertilization.

3. **Analyzing Options**:
- **Option 1: Proto-Antry**: This term refers to a condition where pollen is released before the stigma is mature. This does not match our scenario.
- **Option 2: Protogyny**: This term describes a condition where the stigma is receptive before the pollen is released. This matches our scenario perfectly.
- **Option 3: Homogamy**: This refers to a condition where pollen release and stigma receptivity occur simultaneously. This is not what we are looking for.
- **Option 4: Hercogamy**: This term refers to a structural arrangement that prevents self-fertilization. It does not apply to the timing of pollen release and stigma receptivity.

4. **Conclusion**: Based on the analysis, the correct answer is **Option 2: Protogyny**, as it accurately describes the situation where the stigma is receptive before the pollen is released.

### Final Answer:
**The correct answer is Protogyny.**