Which of the following does not show protogyny?

Options

A. Polyalthia
B. Aristolochia
C. Rose
D. Sunflower

Answer

To determine which of the following does not show protogyny, we first need to understand what protogyny is.

### Step-by-Step Solution:

1. **Define Protogyny**: Protogyny is a reproductive condition in flowering plants where the female reproductive organs mature before the male reproductive organs. This ensures that the female part is ready to receive pollen before the male part is ready to release it, promoting cross-fertilization.

2. **Identify the Options**: The options given are:
- A) Polyalthia
- B) Rose
- C) Aristolochia
- D) Sunflower

3. **Analyze Each Option**:
- **Polyalthia**: This plant exhibits protogyny, as its female parts mature before the male parts.
- **Rose**: Roses also show protogyny, with the female parts maturing first.
- **Aristolochia**: This plant is known to have protogynous characteristics as well.
- **Sunflower**: In sunflowers, the male reproductive parts mature before the female parts, which means it does not exhibit protogyny.

4. **Conclusion**: Since the question asks for the option that does not show protogyny, the correct answer is **D) Sunflower**.

### Final Answer:
**D) Sunflower**