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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 1 · Q11
"Variation is useful for the survival of species over time." Explain this statement with the help of an example.
"Variation is useful for the survival of species over time." Explain this statement with the help of an example.
Marking-scheme solution
Variation provides chance for species to survive under unfavourable / changing environmental conditions. e.g. 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.
All How do Organisms Reproduce? questions2026 question paperNCERT solutions: How do Organisms Reproduce?Practice How do Organisms Reproduce? →
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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.