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Biology · 2023 · 3 marks
CBSE 2023 · Region 3 · Set 1 · Q24
Given below is a diagrammatic sectional view of a seminiferous tubule. State the developmental process of: (a) (i) 'b' from 'a'. (ii) 'e' from 'd'.…
Given below is a diagrammatic sectional view of a seminiferous tubule. State the developmental process of :
(a)(i)
'b' from 'a'.
(ii)
'e' from 'd'.
(iii)
'd' from 'b'.
(b)
Identify 'a', 'b' and 'c'.
Marking-scheme solution
(a)(i)
'b' (secondary spermatocytes) formed after first meiotic division/ Meiosis -I in 'a' (primary spermatocytes)
(ii)
'e' (sperms) formed via a process called spermiogenesis/ differentiation from 'd' (spermatids)
(iii)
'd' (Spermatids) formed after second meiotic division/ Meiosis- II from 'b' ( secondary spermatocyte).
(b)
a - Primary spermatocyte
b - Secondary spermatocyte
c - Sertoli cell
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.