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Biology · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 1 · Q13
Assertion (A): Activated sludge contains large population of bacteria. Reason (R): These bacteria help in anaerobic digestion of human waste in…
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
(C)
Assertion (A) is true, but Reason (R) is false.
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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.