CBSE 2025 · Region 7 · Set 1 · Q23 · 3 marks
(a)"The process of evolution of different species in a given geographical area starts from a point and literally radiates to other geographical areas." Explain it with an example.(b)Cite an example where more than one adaptive radiation has occurred in an isolated geographical area. Name the type of evolution your example depicts.
(a)
"The process of evolution of different species in a given geographical area starts from a point and literally radiates to other geographical areas." Explain it with an example.
(b)
Cite an example where more than one adaptive radiation has occurred in an isolated geographical area. Name the type of evolution your example depicts.
Marking-scheme solution
(a)
This is adaptive radiation leading to divergent evolution.
Example – Many varieties of Darwin’s finches on the same island arose from the original seed-eating finches with altered beaks enabling them to become insectivorous and vegetarian finches / A number of marsupials different from each other evolved from an ancestral stock but all within the Australian island
.
(b)
• Example-Evolution of Placental mammals and Australian Marsupials or
any other corresponding example of these categories respectively.
• Convergent evolution.
EvolutionWhat Is Adaptive Radiation?Understandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.