CBSE 2026 · Region 5 · Set 2 · Q13 · 1 mark
Assertion (A) : Genetically modified microbes help in crop protection.
Reason (R) : Bacillus thuringiensis (Bt) bacteria control insects by producing prototoxins.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Microbes in Human WelfareMicrobes as Biocontrol AgentsAnalyseassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.