CBSE 2024 · Region 1 · Set 1 · Q28 · 3 marks
(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.
(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.
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and EventsUnderstandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.