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Q. Which of the following options is correct?
$\,\,\,$ Haploid$\,\,\,$ Diploid$\,\,\,$
(a)$\,\,\,$ Secondary oocyte$\,\,\,$ Primary spermatocyte$\,\,\,$
(b)$\,\,\,$ Secondary spermatocyte$\,\,\,$ Secondary oocyte$\,\,\,$
(c)$\,\,\,$ Primary oocyte$\,\,\,$ Secondary spermatocyte$\,\,\,$
(d)$\,\,\,$ Ovum$\,\,\,$ Spermatid$\,\,\,$

Human Reproduction

Solution:

Secondary oocyte is formed by meiotic division of primary oocyte $(2n)$, therefore, it is haploid. Primary spermatocyte is formed by mitotic division of spermatogonium $(2n)$, therefore it is diploid.