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Jan Ingenhousz showed that the purification of air by plants requires

(a) sunlight Correct
(b) soil Your answer
(c) darkness Your answer
(d) high temperature Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Jan Ingenhousz showed that sunlight is essential: plants could purify air only when they were in light; only the green parts did so.

Why the other options are wrong

(b) · your answer Soil is not needed for plants to purify air.
(c) · your answer In the dark, plants do not purify air.
(d) · your answer High temperature was not the factor; light was.

NCERT point: Ingenhousz used an aquatic plant and saw bubbles of O₂ form around green parts only in light.

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