State one advantage and one disadvantage of cleistogamy.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Cleistogamy**: Cleistogamy refers to a type of flowering where the flowers remain closed and do not open. In these flowers, the anthers (the pollen-producing part) are not exposed to the external environment.

2. **Advantage of Cleistogamy**:
- One significant advantage of cleistogamy is that it does not require any external pollinators or agents for fertilization. Since the flowers are closed, self-pollination occurs naturally within the flower itself, ensuring that fertilization can take place without the need for insects, wind, or other pollinators.

3. **Disadvantage of Cleistogamy**:
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