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Biology · 2025 · 2 marks
CBSE 2025 · Region 6 · Set 1 · Q17
(a) How is the interaction between Ophrys and its specific bee pollinator one of the best examples of co-evolution? Explain.
How is the interaction between Ophrys and its specific bee pollinator one of the best examples of co-evolution ? Explain.
Arrange the given important steps of decomposition in their correct order of occurrence in the breakdown of complex organic matter and explain the fourth step in the process.
Marking-scheme solution
(a)
One petal of Ophrys bear uncanny resemblance to the female of the bee in size
colour and marking, male bee pseudo-copulates with the flower considering it as a female and during the process is dusted with pollen from the flower.
OR
(b)
Fragmentation, leaching, Catabolism, humification, Mineralisation
Humification: It leads to accumulation of a dark coloured amorphous substance which is called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.
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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.