Choose the correct statement from the following.

Options

A. Cleistogamous flowers always exhibit autogamy
B. Chasmogamous flowers always exhibit geitonogamy
C. Cleistogamous flowers exhibit both autogamy and geitonogamy
D. Chasmogamous flowers never exhibit autogamy

Answer

To solve the question, we need to analyze each of the provided statements regarding clistogamous and chasmogamous flowers.

### Step-by-Step Solution:

1. **Understanding Clistogamous Flowers**:
- Clistogamous flowers are closed flowers where the anthers and stigmas are not exposed to the environment.
- Since these flowers do not open, they cannot undergo cross-pollination (also known as geitonogamy).
- Therefore, they only exhibit autogamy, which is self-pollination.
- **Conclusion**: The first statement is correct.

2. **Understanding Chasmogamous Flowers**:
- Chasmogamous flowers are open flowers where the anthers and stigmas are exposed.
- These flowers can undergo both autogamy (self-pollination) and geitonogamy (cross-pollination).
- The second statement claims that chasmogamous flowers always exhibit geitonogamy, which is incorrect because they can also self-pollinate.
- **Conclusion**: The second statement is incorrect.

3. **Analyzing the Third Statement**:
- The third statement suggests that clistogamous flowers can exhibit both autogamy and geitonogamy.
- As established earlier, clistogamous flowers are closed and cannot perform geitonogamy.
- **Conclusion**: The third statement is incorrect.

4. **Analyzing the Fourth Statement**:
- The fourth statement claims that chasmogamous flowers never exhibit autogamy.
- Since chasmogamous flowers can self-pollinate, this statement is also incorrect.
- **Conclusion**: The fourth statement is incorrect.

### Final Answer:
The only correct statement is the first one: "Clistogamous flowers always exhibit autogamy."

---