Post - Fertilization events do not include
A.Formation of primary endosperm cell
B. Maturation of ovules in seed
C. Formation of ovary into fruit
D. Formation of endosperm and embryo development

Options

A. Only A
B. Only B
C. Only C
D. None of them

Answer

To determine which of the options A, B, C, or D does not include post-fertilization events, we need to analyze each option based on the process of fertilization and subsequent events in flowering plants.

### Step-by-Step Solution:

1. **Understanding Fertilization**:
- In flowering plants (angiosperms), fertilization involves a process called double fertilization. This occurs when one male gamete fuses with the egg cell to form a zygote (this is known as syngamy), and the other male gamete fuses with two polar nuclei in the central cell of the embryo sac to form the primary endosperm nucleus (this is known as triple fusion).

2. **Analyzing Option A**:
- **Formation of primary endosperm cell**: This occurs during fertilization as a result of triple fusion. Therefore, it is not considered a post-fertilization event.

3. **Analyzing Option B**:
- **Maturation of ovules in seed**: After fertilization, the fertilized ovule develops into a seed. This is a post-fertilization event.

4. **Analyzing Option C**:
- **Formation of ovary into fruit**: After fertilization, the ovary develops into a fruit. This is also a post-fertilization event.

5. **Analyzing Option D**:
- **Formation of endosperm and embryo development**: After fertilization, the primary endosperm nucleus develops into endosperm, and the zygote develops into an embryo. Both of these processes occur post-fertilization.

### Conclusion:
From the analysis, we can conclude that the option that does not include post-fertilization events is:
**A. Formation of primary endosperm cell**.