Autogamy can occur in a chasmogamous flower if

Options

A. pollen matures before maturity of ovule
B. ovules mature before maturity of pollen
C. both pollen and ovules mature simultaneously
D. both anther and stigma are of equal lengths.

Explanation

### Step-by-Step Solution:

1. **Understanding Autogamy**:
- Autogamy refers to the process of self-pollination where the male and female gametes come from the same individual plant. This is a form of reproduction in flowering plants.

2. **Chasmogamous Flowers**:
- Chasmogamous flowers are those that have exposed anthers and stigmas, allowing for the possibility of pollination to occur. This type of flower can facilitate both self-pollination (autogamy) and cross-pollination.

3. **Conditions for Autogamy**:
- For autogamy to occur in chasmogamous flowers, both the pollen (male gamete) and the ovules (female gamete) must be mature at the same time. This simultaneous maturation is crucial for self-pollination to take place.

4. **Evaluating the Options**:
- **Option 1**: Pollen matures before ovules - This would not allow for autogamy since the pollen would be ready to fertilize before the ovules are available.
- **Option 2**: Ovules mature before pollen - Similar to the first option, this would also prevent autogamy as the ovules would be ready before the pollen.
- **Option 3**: Both pollen and ovules mature simultaneously - This is the correct condition for autogamy, as both gametes would be available for fertilization at the same time.
- **Option 4**: Both anther and stigma are of equal lengths - This is not a necessary condition for autogamy; it does not influence the timing of maturation.

5. **Conclusion**:
- The correct answer is that autogamy can occur in chasmogamous flowers if both pollen and ovules mature simultaneously.