CBSE 2025 · Region 5 · Set 1 · Q28 · 3 marks
Many of the flowering plants producing hermaphrodite flowers have developed many devices to discourage self-pollination and to encourage cross-pollination. Given below is a picture of one such outbreeding device in a flowering plant. Study the picture and answer the questions that follow :
Flowers present on different plants of same species(a)Explain how the given type of pollination is advantageous to the plant.(b)Can this flowering plant show geitonogamy? Justify your answer.
Many of the flowering plants producing hermaphrodite flowers have developed many devices to discourage self-pollination and to encourage cross-pollination. Given below is a picture of one such outbreeding device in a flowering plant. Study the picture and answer the questions that follow :
Flowers present on different plants of same species
(a)
Explain how the given type of pollination is advantageous to the plant.
(b)
Can this flowering plant show geitonogamy? Justify your answer.
Marking-scheme solution
(a)
The given type of pollination prevents inbreeding depression/ prevents loss of
fertility/promote hybrid vigour/ improve genetic variability
(b)
The plant will not show geitonogamy
because in this flowering plant pollen release and stigma receptivity are not
synchronised/as the flowers are present on different plants.
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and EventsUnderstandshort_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.