MHT CET · BIOLOGY · STD 12 - 2. Reproduction in Lower and Higher Animals

The rhythm method of temporary contraception is based on following feature of menstrual cycle.

A Consecutive menstrual cycles are separated by 28 days.
B The luteal phase of menstrual cycle has duration of 14 days.
C A week after ovulation is only safe period for sexual intercourse.
D A week before and after ovulation are safe period for sexual intercourse as chances of fertilization are less.

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Answer & Solution

Correct Answer

(D) A week before and after ovulation are safe period for sexual intercourse as chances of fertilization are less.

Step-by-step Solution

Detailed explanation

Rhythm method of temporary contraception is based on the fact that ovulation occurs on the 14th day of menstrual cycle.
During this period chances of fertilization are high. Its drawback lies in having a high rate of failure.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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