Which of the following scientist concluded by his experiments that green plants play a role in purifying the noxious air only in the presence of sunlight?

Priestley

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Ingenhousz

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Sachs

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Engelmann

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Solution

The correct option is A Ingenhousz
Jan Ingenhousz (1730-1799), in his experiment with an aquatic plant, showed that in bright sunlight, small bubbles were formed around the green parts while in the dark, no such bubbles formed. He found out these bubbles to be of oxygen. He thus, confirmed that purification of air or formation of dephlogiston is carried out by green plants only in presence of sunlight.

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