Question

Oral contraceptive pills mainly prevent pregnancy by _______

• A. Increasing ovulation
• B. Preventing ovulation
• C. Increasing fertilization
• D. Increasing implantation

Hint:

Oral contraceptive pills mainly act by suppressing ovulation.

Answer 1

The Correct Option is B

Concept:
Oral contraceptive pills contain hormones that prevent pregnancy.

Step 1: Ovulation means release of ovum from ovary.

Step 2: If ovulation does not occur, fertilization cannot take place.

Step 3: Oral contraceptives suppress pituitary gonadotropins such as FSH and LH.

Step 4: This prevents ovulation.

Step 5: Therefore, oral contraceptives mainly prevent pregnancy by preventing ovulation. \[ \boxed{\text{Preventing ovulation}} \]