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The scientist who showed with a bell jar, a candle and a mouse that plants restore "damaged" air was
Your answer:
Correct answer: (d)
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Explanation
Why (d) is correct
Joseph Priestley (1770) showed that a candle or a mouse in a closed bell jar soon dies or goes out, but a mint plant restores the air.
Why the other options are wrong
- (a) · your answer Robert Hooke described cells; he did not do this experiment.
- (b) · your answer Julius von Sachs showed that starch (glucose) is made in green parts of the plant.
- (c) · your answer Jan Ingenhousz showed that sunlight is needed for plants to purify air.
NCERT point: Priestley's experiment led to the discovery of oxygen.
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Practise Photosynthesis in Higher Plants
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