Describe the methods of birth control by which fertilization of ovum by sperm is prevented.

Explanation

To describe the methods of birth control that prevent the fertilization of an ovum by sperm, we can categorize them into several types: mechanical methods, chemical methods, hormonal methods, and surgical methods. Here’s a step-by-step breakdown of each method:

### Step 1: Mechanical Methods
- **Condoms**: Male condoms are a barrier method that is worn on the penis during intercourse. They prevent sperm from entering the female reproductive tract.
- **Cervical Caps**: These are fitted into the vagina and cover the cervix, preventing sperm from entering the uterus.

**Hint**: Think of mechanical methods as physical barriers that block sperm from reaching the egg.

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