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Biology · 2024 · 3 marks
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and Events3 marksUnderstandshort answer
CBSE 2024 · Region 1 · Set 1 · Q28
(a) Explain how it is ensured that the orchid Ophrys is pollinated by a specific species of bee. (b) Describe co-evolution with the help of this…
(a)
Explain how it is ensured that the orchid Ophrys is pollinated by a specific species of bee.
(b)
Describe co-evolution with the help of this example.
Marking-scheme solution
(a)
-Orchid Ophrys employs ‘Sexual Deceit’to get pollinated by a species of bee
-one petal of flower resembles female of bee in size, colour and markings
-Male bee attracted and pseudocopulates the flower and gets dusted with pollens.
-When same bee ‘pseudocopulates’ with other flower, it transfers the pollens to it.
(b)
If female bee pattern changes during evolution the flower needs to co-evolve to resemble the female bee to get pollinated.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.