CBSE 2026 · Region 5 · Set 1 · Q15 · 1 mark
Assertion (A) : Trichoderma species are free living fungi that are very common in the root ecosystems.
Reason (R) : They are effective bio-control agents of several plant pathogens.
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 AgentsUnderstandassertion_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.