CBSE 2026 · Region 3 · Set 1 · Q13 · 1 mark
Assertion (A) : Activated sludge contains large population of bacteria. Reason $\displaystyle (R)$ : These bacteria help in anaerobic digestion of human waste in biogas plant.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Assertion (A) is true, but Reason (R) is false.
Microbes in Human WelfareMicrobes in Production of BiogasUnderstandassertion_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.