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In testis, the immature male germ cells (spermatogonia) produce sperm by spermatogenesis which begins at puberty. The spermatogonia (sing. spermatogonium) are present on the inner wall of seminiferous tubules. Study the chart of spermatogenesis below and answer the questions.
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(i) What do x and y stands for given diagram?
(ii) What is the process of sperm synthesis from spermatids known as?
(iii) What is the ploidy of primary spermatocytes, secondary spermatocytes, spermatids and sperms?
(iv) How many sperms will be produced from 100 primary spermatocytes?

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(i) Meiosis I and Meiosis II (ii) The formation of sperms from the spermatids is called spermiogenesis. (iii) Primary Spermatocyte - 2n Secondary Spermatocyte - n Spermatid - n Sperm – n (iv) 1 Primary Spermatocytes give rise to 4 sperms. Thus, 400 sperms will be produced from 100 primary Spermatocytes.