CBSE 2026 · Region 4 · Set 1 · Q24 · 3 marks
Explain the three different ways in which natural selection operates. Explain with the help of graphs.
Marking-scheme solution
Stabilising – more individuals acquire the mean character value i.e variation is much reduced.
Directional – more individuals acquire value other than the mean character value.
Disruptive – more individuals acquire peripheral character value at both ends of the distribution curve two peaks are formed.
EvolutionMechanism of EvolutionUnderstandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.