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Science · 2025 · 1 mark
The Human Eye and the Colourful WorldThe Human Eye and Power of Accommodation1 markAnalyseassertion reason
CBSE 2025 · Region 4 · Set 1 · Q20
Assertion (A): When ciliary muscles contract, eye lens becomes thin. Reason (R): Ciliary muscles control the power of the eye lens.
Assertion (A) : When ciliary muscles contract, eye lens becomes thin.
Reason (R) : Ciliary muscles control the power of the eye lens.
Official answer
(D)
Assertion (A) is false, but Reason (R) is true.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.