Contraceptive pills help in birth control by:

Killing the sperms in uterus

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Forming barriers between sperms and ova

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Preventing ovulation

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Killing the ova

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Solution

The correct option is C Preventing ovulation
Contraceptive pills contain high concentrations of progesterone and low doses of oestrogen. This leads to suppression of FSH and LH secretion (because progesterone has inhibitory effect on FSH and LH). The menstrual cycles continue but without ovulation thereby providing contraception.

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