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Biology · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 3 · Q27
(a) List the salient features of Darwin's theory of natural selection. (b) Microbes have proved to be suitable examples to study evolution by natural…
(a)
List the salient features of Darwin's theory of natural selection.
(b)
Microbes have proved to be suitable examples to study evolution by natural selection. Justify giving reasons.
Marking-scheme solution
(a)
Population size grows exponentially, compete for resources only some survive and grow and others or weaker perish, organisms with favourable variations survive and reproduce called survival of the fittest, favourable variations get accumulated over a period of time and get naturally selected so that new forms arise.
(b)
Microbes divide fast with shorter life span and, variations can be observed
in larger population within short time.
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