Fertilisation which takes place outside the female body is called :

Options

A. Internal fertilisation
B. External fertilisation
C. Both of these
D. None of these

Explanation

To answer the question "Fertilisation which takes place outside the female body is called:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fertilization**:
- Fertilization is the process where male and female gametes (sperm and egg) fuse to form a zygote.

2. **Types of Fertilization**:
- There are two main types of fertilization: internal fertilization and external fertilization.

3. **Internal Fertilization**:
- In internal fertilization, the male gamete is introduced into the female body, where fertilization occurs. This means the fusion of gametes takes place inside the female reproductive system.

4. **External Fertilization**:
- In external fertilization, the male and female gametes are released into the environment (often water), and fertilization occurs outside the female body. This is common in many aquatic animals, where eggs and sperm are released into the water.

5. **Identifying the Correct Answer**:
- Since the question specifically asks for fertilization that occurs outside the female body, the correct term is "external fertilization."

6. **Conclusion**:
- Therefore, the answer to the question is **external fertilization**.

### Final Answer:
Fertilisation which takes place outside the female body is called **external fertilization**.

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