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Joseph Priestley's experiment of 1770 showed that

(a) the oxygen released by plants comes from water Your answer
(b) starch is formed in the chloroplasts of leaves Your answer
(c) plants restore air spoilt by a candle or a mouse Correct
(d) sunlight is essential for plants to purify air Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

Priestley showed that a mint plant could restore the air that had been spoilt by a burning candle or a breathing mouse.

Why the other options are wrong

(a) · your answer That O₂ comes from water was shown much later (van Niel, isotope studies).
(b) · your answer Starch formation in leaves was shown by Julius von Sachs.
(d) · your answer The need for sunlight was shown by Jan Ingenhousz.

NCERT point: Priestley (1770): plants restore the air that burning candles and breathing animals spoil.

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