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Biology · 2023 · 2 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events2 marksUnderstandvery short answer
CBSE 2023 · Region 1 · Set 1 · Q18
(a) From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower? (b) State the fate of the male…
(a)
From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower ?
(b)
State the fate of the male nuclei present in the pollen tube.
Marking-scheme solution
(a)
From micropylar end, through the synergids (filiform apparatus)/filiform (within synergids) apparatus guides the entry of pollen tube (b) One male nucleus fuses with two polar nuclei to form Primary endosperm nucleus and termed triple fusion, other male nucleus fuses with egg cell nucleus to form zygote i.e. undergoes Syngamy
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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.