Cross pollination doen not occur in

Options

A. Allogamous flowers
B. Geitonogamous flowers
C. Cleistogamous flowers
D. Chasmogamous flowers.

Answer

To solve the question "Cross pollination does not occur in," we need to analyze the options provided and understand the characteristics of each type of flower mentioned.

### Step-by-Step Solution:

1. **Understand the Types of Flowers:**
- **Allogamous Flowers:** These flowers are designed for cross-pollination. They have mechanisms that promote the transfer of pollen from one flower to another, often involving pollinators.
- **Gametogamous Flowers:** This term typically refers to flowers that can undergo sexual reproduction through gametes, which may involve cross-pollination.
- **Clistogamous Flowers:** These flowers do not open and are self-pollinating. The anthers and stigma are in close proximity, allowing pollen to fertilize the ovules without the need for external pollinators.
- **Casmogamous Flowers:** This term is not standard in botanical terminology, but if it refers to flowers that are capable of cross-pollination, it would not be the correct answer.

2. **Identify the Flower That Does Not Cross-Pollinate:**
- Among the options, **Clistogamous flowers** are the ones that do not engage in cross-pollination. They self-pollinate because they remain closed, preventing any external pollen from entering.

3. **Conclusion:**
- Therefore, the correct answer to the question is **Clistogamous flowers**.

### Final Answer:
Cross pollination does not occur in **Clistogamous flowers**.

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