Question

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

• A. Priestley
• B. Ingenhousz
• C. Sachs
• D. Engelmann

Answer 1

Answer: (B)

Ingenhousz

Answer 2

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.