Give reasons: Blocking of Fallopian tubes prevents pregnancy.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Role of Fallopian Tubes**: The Fallopian tubes, also known as oviducts, are crucial for reproduction as they are the pathways through which the egg travels from the ovary to the uterus. They are also the site where fertilization typically occurs when a sperm meets an egg.

2. **Definition of Tubectomy**: Tubectomy is a surgical procedure that involves blocking or cutting the Fallopian tubes. This method is a form of sterilization and is used to prevent pregnancy permanently.

3. **Mechanism of Action**: When the Fallopian tubes are blocked, the egg released from the ovary cannot reach the uterus. Similarly, sperm cannot travel through the Fallopian tubes to meet the egg. This blockage effectively prevents fertilization from occurring.

...