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Biology · 2024 · 4 marks
CBSE 2024 · Region 2 · Set 1 · Q29
Read the following passage and answer the questions that follow. Spermatogenesis is an important primary sex characteristic in humans and all other…
Read the following passage and answer the questions that follow. Spermatogenesis is an important primary sex characteristic in humans and all other vertebrates. The process is coordinated and controlled under the influence of hormones. It starts with the onset of puberty in humans and thereafter continues. The primordial cells within the embryonic testis which differentiate into spermatogonia are the precursors of the sperms. These are located at the outer walls of the seminiferous tubules where the process of spermatogenesis proceeds.
(a)
State the site of action of FSH in the testes and describe its action thereafter.
OR
(a)
Describe the role of LH in the process of spermatogenesis.
(b)
Name the cells and their products which undergo :
(i)
Mitosis and Differentiation
(ii)
Meiosis I and Meiosis II during the process of spermatogenesis.
(c)
Name the accessory ducts that the sperms travel through from seminiferous tubules to reach the epididymis.
Marking-scheme solution
(a)
Sertoli cells in seminiferous tubule, induces release of some factors which induce
spermiogenesis.
OR
(a)
LH acts on Leydig cells, and stimulates the synthesis and secretion of androgens for
spermatogenesis.
(b)(i)
Spermatogonia
𝑚𝑖𝑡𝑜𝑠𝑖𝑠/𝑑𝑖𝑓𝑓𝑒𝑟𝑒𝑛𝑡𝑖𝑎𝑡𝑖𝑜𝑛
→ Primary Spermatocyte
(ii)
Primary Spermatocyte
𝑚𝑒𝑖𝑜𝑠𝑖𝑠 𝐼
→ Secondary Spermatocyte
𝑚𝑒𝑖𝑜𝑠𝑖𝑠 𝐼𝐼
→
Spermatid
(c)
Rete testis, vasa efferentia
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.