CBSE 2025 · Region 2 · Set 3 · Q17 · 2 marks
Student to attempt either option (A) or (B).Comment upon the mode of pollination in Vallisneria and Zostera.Mention any four strategies adopted by flowering plants to prevent self-pollination.
Student to attempt either option (A) or (B).
Comment upon the mode of pollination in Vallisneria and Zostera.
Mention any four strategies adopted by flowering plants to prevent self-pollination.
Marking-scheme solution
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.
Pollen release and stigma receptivity are not synchronised , anther and stigma are placed at different positions , Self incompatibility , production of unisexual flowers
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and EventsUnderstandvery_short_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.