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Biology · 2025 · 3 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events3 marksApplyshort answer
CBSE 2025 · Region 2 · Set 2 · Q22
(a) A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther? (b)…
(a)
A bilobed dithecous anther has $\displaystyle 200$ microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther ?
(b)
Write the composition of intine and exine layers of a pollen grain.
Marking-scheme solution
(a)
$\displaystyle 3200$ male gametophyte
(b)
$\displaystyle \star$ Intine made up of cellulose, and pectin.
$\displaystyle \star$ Exine made up of sporopollenin.
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.