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Progesterone, the component of the oral contraceptive pills, prevents pregnancy by

1. preventing the cleavage of the fertilized egg
2. preventing the formation of ova
3. blocking ovulation
4. creating unfavourable chemical environment for the sperms to survive in the female reproductive tract

Correct answer: blocking ovulation

Solution

Progesterone in oral contraceptive pills provides negative feedback on the pituitary, suppressing FSH and especially the LH surge needed for ovulation. Without ovulation, no egg is available for fertilization, so pregnancy cannot begin.

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