Which one of the following statement is correct

Options

A. geitonogamy involves the pollen and stigma of flower of different plants
B. clesitogamous flowers are always atuogamous
C. xenogamy occurs only by wind pollination
D. chasmogamous flower do not open at all

Answer

To determine which statement is correct regarding the types of pollination and flower characteristics, let's analyze the statements one by one.

### Step-by-Step Solution:

1. **Understanding Jetonogamy:**
- Jetonogamy refers to the transfer of pollen from the anther to the stigma of the same flower or plant.
- The statement that jetonogamy involves pollen and stigma from different plants is incorrect. This characteristic belongs to xenogamy, where pollen is transferred between different plants.

**Hint:** Jetonogamy = same plant; Xenogamy = different plants.

2. **Understanding Clistogamous Flowers:**
- Clistogamous flowers are those that remain closed even at maturity and primarily exhibit self-pollination (autogamy).
- Since they do not open, cross-pollination cannot occur in clistogamous flowers.

**Hint:** Clistogamous flowers = always closed, self-pollinating.

3. **Understanding Xenogamy:**
- Xenogamy involves the transfer of pollen from one plant to another, which can occur through various agents, including wind, insects, or animals.
- The statement that xenogamy occurs only by wind is incorrect, as it can involve multiple pollination agents.

**Hint:** Xenogamy = different plants + multiple pollination agents.

4. **Understanding Chasmogamous Flowers:**
- Chasmogamous flowers are characterized by their ability to open, allowing for both self-pollination and cross-pollination.
- The statement that chasmogamous flowers do not open is incorrect; this is a characteristic of clistogamous flowers.

**Hint:** Chasmogamous flowers = open flowers; Clistogamous flowers = closed flowers.

### Conclusion:
The correct statement among the options is that clistogamous flowers are almost autogamous, as they remain closed and primarily self-pollinate.

### Final Answer:
The correct statement is: "The clistogamous flowers are almost autogamous."