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Biology · 2025 · 4 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events4 marksUnderstandcase study
CBSE 2025 · Region 7 · Set 3 · Q30
The following question is based on pollination. Study the figures carefully and answer the questions that follow. Pollens Figure A Figure B (a) Give…
The following question is based on pollination. Study the figures carefully and answer the questions that follow. Pollens
Figure A Figure B
(a)
Give the scientific terms for the processes taking place in Figures A and B respectively.
(b)
Mention two conditions necessary for the process occurring in Figure B.
(c)(i)
State one advantage and one disadvantage of the process occurring in Figure B.
OR
(c)
(ii)
Name one plant where, in some flowers only, the process in Figure B takes place and give the reason responsible for it.
Marking-scheme solution
(a)
A – Geitonogamy
B – Autogamy
(b)
-Anthers and stigma to be close to each other in a bisexual flower cleistogamous
flower / closed flower / Pollen release and stigma receptivity at the same time
(c)(i)
Advantage → Assured seed set /no dependence on pollinators / pure
breed can be obtained.
Disadvantage → No genetic variation / Inbreeding depression
OR
(c)
(ii)
• Oxalis/ Viola or common pansy/ Commelina.
• Some flowers do not open at all /cleistogamy / closed flower hence show
autogamy.
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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.