The sequential events in the sexual reproduction may be grouped into

Options

A. Two stages-gametogenesis and gamete transfer
B. Three stages-gametogenesis and gamete transfer and fertilisation
C. Two stages-gametogenesis and embryogenesis
D. Three stages-pre fertilisation, fertilisation and post fertilisation events

Answer

To answer the question regarding the sequential events in sexual reproduction, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Sexual Reproduction**: Sexual reproduction involves the fusion of male and female gametes, leading to the formation of a zygote. This process can be divided into distinct stages.

2. **Identifying the Stages**:
- **Pre-fertilization Events**: These are the events that occur before the fusion of gametes. They include:
- **Gametogenesis**: The process of formation of male and female gametes (sperm and egg).
- **Gamete Transfer**: The mechanism by which gametes are brought together for fertilization.

- **Fertilization**: This is the event where the male and female gametes fuse to form a zygote.

- **Post-fertilization Events**: These are the events that occur after fertilization, which include the development of the zygote into an embryo and further stages of development.

3. **Conclusion**: Based on the categorization of these events, sexual reproduction can be grouped into three main stages:
- Pre-fertilization
- Fertilization
- Post-fertilization

4. **Final Answer**: Therefore, the correct option for the question is **three stages: pre-fertilization, fertilization, and post-fertilization events**.