Cleistogamous flowers produce assured seed set even in the absence of pollinator -why?

Options

A. Because they have fragrance
B. Because they remain open
C. Because they are autogamous
D. Because they are colourful

Answer

### Step-by-Step Solution:

1. **Understanding Cleistogamous Flowers**: Cleistogamous flowers are a type of flower that remain closed and do not open. This characteristic is crucial for their reproductive strategy.

2. **Pollination Mechanism**: In cleistogamous flowers, pollination occurs within the closed flower itself. This means that the pollen from the anthers can fertilize the ovules without the need for external pollinators.

3. **Self-Pollination**: Since cleistogamous flowers are typically bisexual (having both male and female reproductive parts), they can achieve self-pollination. This is referred to as autogamy.

4. **Assured Seed Set**: Because the flowers are closed and facilitate self-pollination, they can produce seeds even in the absence of pollinators. This ensures a reliable seed set, which is advantageous in environments where pollinators may be scarce.

5. **Conclusion**: Therefore, the reason cleistogamous flowers produce assured seed set even in the absence of pollinators is that they are autogamous, allowing for self-pollination within the closed flower.

### Final Answer:
Cleistogamous flowers produce assured seed set even in the absence of pollinators because they are autogamous.

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