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In the half-leaf experiment, one part of a leaf is enclosed in a test tube containing cotton soaked in KOH. That part shows no starch. KOH is used to

(a) absorb light Your answer
(b) supply water Your answer
(c) absorb CO₂ Correct
(d) supply oxygen Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

KOH absorbs CO₂, so the part of the leaf inside the tube gets no CO₂ and cannot make starch.

Why the other options are wrong

(a) · your answer KOH does not absorb light.
(b) · your answer KOH does not supply water to the leaf.
(d) · your answer KOH does not supply oxygen.

NCERT point: This half-leaf experiment shows that CO₂ is needed for photosynthesis.

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