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Ingenhousz concluded that the purification of air by plants is carried out only by their

(a) flowers Your answer
(b) non-green stems Your answer
(c) roots Your answer
(d) green parts Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

Ingenhousz found that only the green parts of plants could purify (restore) the air, and only in sunlight.

Why the other options are wrong

(a) · your answer Flowers are usually not green and do not purify air.
(b) · your answer Non-green stems lack chlorophyll.
(c) · your answer Roots lack chlorophyll.

NCERT point: Green parts have chlorophyll.

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