Identify flower which is not epigenous.

Options

A. Ray floret of sunflower
B. Plum
C. Guava
D. Cucumber

Answer

To solve the question of identifying which flower is not epigenous from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Flower Types Based on Ovary Position**:
- Flowers can be classified based on the position of the ovary relative to other floral parts (calyx, corolla, and androsium). The three main types are:
- **Hypogynous**: Gynosium is at the highest position (superior ovary).
- **Perigynous**: Gynosium is in the center, with other parts at the same level (half inferior ovary).
- **Epigynous**: Gynosium is enclosed by the thalamus, which fuses with it, making the ovary inferior.

2. **Analyze Each Option**:
- **A. Ray florets of Sunflower**: These flowers are epigynous, as the ovary is inferior.
- **B. Plum**: Plum flowers are classified as perigynous, meaning the ovary is half inferior.
- **C. Guava**: Guava flowers are epigynous, with an inferior ovary.
- **D. Cucumber**: Cucumber flowers are also epigynous, having an inferior ovary.

3. **Identify the Non-Epigynous Flower**:
- From the analysis, the only flower that is not epigynous is **Plum**, which is classified as perigynous.

4. **Conclusion**:
- The flower that is not epigenous among the options provided is **B. Plum**.

### Final Answer:
**B. Plum**