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Biology · 2026 · 3 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events3 marksUnderstandshort answer
CBSE 2026 · Region 1 · Set 1 · Q22
(a) Do all pollen grains remain viable for the same length of time? Support your answer with two suitable examples. (b) How are pollen grains stored…
(a)
Do all pollen grains remain viable for the same length of time ? Support your answer with two suitable examples.
(b)
How are pollen grains stored in pollen banks?
Marking-scheme solution
(a)
No
In cereals or rice or wheat pollen grains loose viability within $\displaystyle 30$ minutes of their release,
In some members of Rosaceae or Leguminoseae or Solanaceae –they maintain viability for months, or any other correct example
-
(b) They are stored using Cryo-preservation techniques / In liquid nitrogen at – 196oC
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.