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The menstrual cycle of a normal human female lasts approximately how many days?
Answer & Solution
Correct answer: C.
1. The reproductive tissue of the uterus is prepared monthly to receive a fertilised egg.
2. When fertilisation does not occur, the lining and unfertilised egg shed as menstrual flow.
3. The full cycle from one period to the next is about 28 days on average.
_Source: NCERT Class 10 Science, Ch 7 "How do Organisms Reproduce", §7.3.3_
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