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Question
Who demonstrated that green plants purify the foul air produced by breathing animals and burning candles?
Who demonstrated that green plants purify the foul air produced by breathing animals and burning candles?
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Solution
The correct option is B Priestley
Joseph Priestley (1770) observed that a candle burning in a closed space - a bell jar, soon gets extinguished. Similarly, a mouse kept in a closed space would soon get suffocated and die. However, when he placed a mint plant in the same bell jar, he found that the mouse stayed alive and candle continued to burn. Priestly hypothesized that foul air or phlogiston produced during burning of candles or animal (mice) respiration could be converted into pure air or dephlogiston by plants (mint). In 1774, Priestley discovered oxygen. So the correct answer is 'Priestley'.
Joseph Priestley (1770) observed that a candle burning in a closed space - a bell jar, soon gets extinguished. Similarly, a mouse kept in a closed space would soon get suffocated and die. However, when he placed a mint plant in the same bell jar, he found that the mouse stayed alive and candle continued to burn. Priestly hypothesized that foul air or phlogiston produced during burning of candles or animal (mice) respiration could be converted into pure air or dephlogiston by plants (mint). In 1774, Priestley discovered oxygen.
So the correct answer is 'Priestley'.
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