Which contraceptive method are also known as sterilisation.

Answer

### Step-by-Step Solution:

1. **Identify the Contraceptive Method**:
- The question asks for contraceptive methods known as sterilization. The primary method that falls under this category is surgical sterilization.

2. **Understand Surgical Sterilization**:
- Surgical sterilization is a method that leads to permanent infertility. This means that individuals who undergo this procedure will not be able to conceive children afterward.

3. **Explain the Procedure**:
- Surgical sterilization can be performed on both males and females.
- In males, the procedure involves the cutting and tying of the vas deferens (the tube that carries sperm), which is known as **vasectomy**. This prevents sperm from mixing with seminal fluid during ejaculation.
- In females, the procedure involves the cutting and tying of the fallopian tubes, which is known as **tubectomy**. This prevents the ovum from meeting sperm, thus avoiding fertilization.

4. **Highlight the Characteristics**:
- Surgical sterilization is considered a safe, convenient, and highly effective method of contraception. However, it is important to note that it is difficult to reverse this procedure, leading to permanent sterility.

5. **Conclude with the Answer**:
- Therefore, the contraceptive methods known as sterilization are **vasectomy** for males and **tubectomy** for females.

### Final Answer:
The contraceptive methods known as sterilization are surgical methods, specifically **vasectomy** in males and **tubectomy** in females.

---