From the given below processes how many are associated with post-fertilisation event ?

Options

A. Syngamy, gamete, transfer
B. Gametogenesis, cell division
C. Cell differentiation, gametic fusion
D. Embryogenesis, PEN formation

Answer

To determine how many processes are associated with post-fertilization events, let's analyze the given processes one by one:

1. **Syngamic gamete transfer**: This refers to the transfer of gametes, which occurs before fertilization. Therefore, this process is **not** associated with post-fertilization events.

2. **Gametogenesis**: This is the process of forming gametes (sperm and egg cells) and occurs prior to fertilization. Thus, this process is also **not** associated with post-fertilization events.

3. **Cell division**: This can refer to various types of cell division, but in the context of fertilization, it typically refers to the division of the zygote after fertilization. However, since it is not specific to post-fertilization events and can also occur in pre-fertilization stages, it is **not** specifically associated with post-fertilization events.

4. **Cell differentiation**: This process occurs after fertilization when the cells begin to specialize and form different tissues and organs. Therefore, this process is **associated** with post-fertilization events.

5. **Gamete fusion**: This is the actual event of fertilization where the male and female gametes fuse to form a zygote. Since this is the fertilization event itself, it is **not** associated with post-fertilization events.

6. **Embryogenesis**: This is the process of development of the embryo from the zygote and is a key post-fertilization event. Therefore, this process is **associated** with post-fertilization events.

7. **Endosperm formation (PEN formation)**: This refers to the formation of the endosperm, which provides nourishment to the developing embryo. This process occurs after fertilization and is therefore **associated** with post-fertilization events.

In summary, the processes that are associated with post-fertilization events are:
- Cell differentiation
- Embryogenesis
- Endosperm formation

Thus, there are **three processes** associated with post-fertilization events.

### Summary of Steps:
1. Identify and analyze each process listed.
2. Determine whether each process occurs before or after fertilization.
3. Count the processes that are specifically associated with post-fertilization events.