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Biology · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 1 · Q27
Explain Gause's 'Competitive Exclusion Principle' with the help of a suitable example.
Explain Gause's 'Competitive Exclusion Principle' with the help of a suitable example.
Marking-scheme solution
− Gause’s competitive exclusion principle states that two closely related species competing for the same limited resources cannot co-exist indefinitely, and competitively inferior one will be eliminated eventually / If resources are limited the stronger competitor will dominate, driving the weaker one to extinction.
− Example: In some shallow American lakes visiting flamingoes and resident fishes compete for their common food i.e. zooplankton in the lake / The
Abingdon tortoise in Galapagos islands became extinct within a decade after the goats were introduced into the island probably due to the greater browsing efficiency of the goat or the feeding efficiency of one species (tortoise) is reduced by the interfering presence of the other species (goat) / any other correct example.
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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.