KEAM Spermatogenesis — practice questions

Explore 2 free Spermatogenesis questions in KEAM Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Spermatogenesis questions and exercises with answers

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During spermatogenesis, a single primary spermatocyte (2n) ultimately yields how many functional spermatozoa?Read the answer and worked solution →How many chromosomes are present in (i) a human secondary spermatocyte, and (ii) a mature spermatozoon?Read the answer and worked solution →

Worked practice questions

During spermatogenesis, a single primary spermatocyte (2n) ultimately yields how many functional spermatozoa?

1 sperm
2 sperms
4 sperms
8 sperms

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Correct answer: C. 4 sperms

Primary spermatocyte (2n) → meiosis I → two secondary spermatocytes (n) → meiosis II → four spermatids (n) → spermiogenesis → **four** functional motile sperms. (Contrast with oogenesis: one primary oocyte → one functional ovum + 3 polar bodies.)

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How many chromosomes are present in (i) a human secondary spermatocyte, and (ii) a mature spermatozoon?

(i) 46, (ii) 46
(i) 23, (ii) 23
(i) 46, (ii) 23
(i) 23, (ii) 46

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Correct answer: B. (i) 23, (ii) 23

Meiosis I converts the diploid primary spermatocyte (2n = 46) into two **haploid** secondary spermatocytes (n = 23). Meiosis II then produces four haploid spermatids (n = 23) which mature into spermatozoa with **23** chromosomes each.