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How do Organisms Reproduce? — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHow do Organisms Reproduce?5 Marks
Question
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
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Answer

Fusion of male gamete sperm and female gamete egg in fallopian tube (oviduct) is called as fertilization. The process starts with introduction of sperms, produced in testes of male, into the vagina of the woman through penis during copulation or mating. Highly active and mobile sperms pass from cervix through the uterus into the oviducts. Ovulation, in female, releases ovum in oviduct. Irrespective of release of millions of sperms into the vagina at one time, only one sperm fuses with the ovum in the oviduct to form a zygote i.e. fertilization.
Ovulation is release of ovum from ovary into oviduct and takes place only once in a month i.e. 14$^{th}$ day of menstrual cycle. Hence, fertilization can occur only once in a month.

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