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Biology · 2025 · 2 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events2 marksUnderstandvery short answer
CBSE 2025 · Region 2 · Set 3 · Q17
Student to attempt either option (A) or (B). (A) Comment upon the mode of pollination in Vallisneria and Zostera.
Student to attempt either option (A) or (B).
(A)
Comment upon the mode of pollination in Vallisneria and Zostera.
OR
(B)
Mention any four strategies adopted by flowering plants to prevent self-pollination.
Marking-scheme solution
(A)
Vallisneria- Female flower reaches surface of water and male flower or
pollen grain are released on the surface of water.
Zostera- Female flower remain submerged in water and pollen grain are
released inside water.
OR
(B)
Pollen release and stigma receptivity are not synchronised , anther and stigma are placed at different positions , Self incompatibility , production of unisexual flowers
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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.