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Question
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
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Solution
In human beings, internal fertilization takes place in female body. During sexual intercourse, sperms reach the vagina and travel upto the fallopian tube where fertilization take place. Sperms deposited in the vagina reach there partly by their own movement and partly by local movements of reproductive tract. A single ovum is released by female roughly in the middle of menstrual cycle which has a span of 28 days. Thus, one egg is released every month from either of the ovaries. Fertilization occurs within 2-3 days of ovulation. Both sperm and ovum remain viable for 1-2 days only. Therefore, fertilization can occur only once in a month.
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