Who demonstrated that green plants purify the foul air produced by breathing animals and burning candles?

Options

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

Answer

A

Explanation

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 and candle continued to burn. Priestley hypothesized that four 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.