All of the following are pre-fertilisation events except

Options

A. Spermatogenesis
B. Oogenesis
C. Gametes transfer
D. Embryogenesis

Answer

To solve the question "All of the following are pre-fertilization events except," we need to identify which of the listed options does not belong to the category of pre-fertilization events. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Pre-Fertilization Events
Pre-fertilization events are the processes that occur before the actual fertilization of the gametes. These include:
- Formation of male gametes (spermatogenesis)
- Formation of female gametes (oogenesis)
- Transfer of gametes (the process of sperm reaching the ovum)

### Step 2: Identify the Options
While the specific options are not provided in the question, we can infer common terms related to reproduction. Typically, options might include:
1. Spermatogenesis
2. Oogenesis
3. Gamete transfer
4. Embryogenesis

### Step 3: Analyze Each Option
- **Spermatogenesis**: This is the process of forming sperm, which is a pre-fertilization event.
- **Oogenesis**: This is the process of forming ova (eggs), also a pre-fertilization event.
- **Gamete Transfer**: This refers to the process of transferring sperm to the ovum, which is again a pre-fertilization event.
- **Embryogenesis**: This is the process that occurs after fertilization, where the fertilized egg develops into an embryo.

### Step 4: Conclusion
From the analysis, we can conclude that the only event that is not a pre-fertilization event is **Embryogenesis**. Therefore, the answer to the question is **Embryogenesis**.

### Final Answer
All of the following are pre-fertilization events except **Embryogenesis**.

---