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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 2 · Q11
Do all variations in a species have equal chances of surviving in the environment in which they find themselves? Explain.
Do all variations in a species have equal chances of surviving in the environment in which they find themselves ? Explain.
Marking-scheme solution
No
Different variations give different advantages to organisms and only those which are beneficial to the organisms for survival are passed on to their progeny. Example- if there were a population of bacteria living in temperate waters and if water temperature increased by global warming, most of these bacteria would die but the few variants resistant to heat would survive and grow further.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.