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Biology · 2026 · 1 mark
CBSE 2026 · Region 5 · Set 1 · Q15
Assertion (A): Trichoderma species are free living fungi that are very common in the root ecosystems. Reason (R): They are effective bio-control…
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
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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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.