Choose the correct statement from the following

Options

A. Cleistogamous flowers always exhibit autemy
B. Chasmogamous flowers alwaysexhibit gelowany
C. Cleistogamous flowers exhibit both automamy and geitonogamy
D. Chasmogamous flowers never ethibit automy

Answer

**Step-by-Step Solution:**

1. **Understanding Clistogamous Flowers**:
- Clistogamous flowers are those that do not open. This means that the reproductive structures (anthers and stigma) are in close proximity, facilitating self-pollination.
- **Hint**: Remember that clistogamous flowers are closed and promote self-pollination.

2. **Defining Autogamy**:
- Autogamy refers to self-pollination, where pollen from the anther of a flower fertilizes the stigma of the same flower.
- **Hint**: Autogamy is a form of self-pollination.

3. **Evaluating the First Statement**:
- The first statement claims that clistogamous flowers always exhibit autogamy. Since these flowers do not open and the reproductive parts are close, this statement is correct.
- **Hint**: Clistogamous flowers are designed for self-pollination, confirming the first statement.

4. **Understanding Chesmogamous Flowers**:
- Chesmogamous flowers are open flowers where the anther and stigma are also close but allow for cross-pollination.
- **Hint**: Chesmogamous flowers can facilitate both self-pollination and cross-pollination.

5. **Evaluating the Second Statement**:
- The second statement suggests that chesmogamous flowers exhibit gytenogamy (pollination between different flowers of the same plant). However, since they can also self-pollinate, this statement is incorrect.
- **Hint**: Chesmogamous flowers can undergo autogamy and xenogamy, not just gytenogamy.

6. **Evaluating the Third Statement**:
- The third statement claims that clistogamous flowers exhibit both autogamy and gytenogamy. Since clistogamous flowers do not open, they cannot exhibit gytenogamy, making this statement incorrect.
- **Hint**: Clistogamous flowers only allow for autogamy.

7. **Evaluating the Fourth Statement**:
- The fourth statement claims that chesmogamous flowers never exhibit autogamy. This is incorrect because chesmogamous flowers have both male and female parts, allowing for self-pollination.
- **Hint**: Bisexual flowers can undergo both autogamy and xenogamy.

8. **Conclusion**:
- After evaluating all the statements, the only correct statement is the first one: "Clistogamous flowers always exhibit autogamy."
- **Final Answer**: The correct statement is option A.