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Biology · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q24
Explain the three different ways in which natural selection operates. Explain with the help of graphs.
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.
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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.