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  4. The following hypothesis, “Plants restore to the air whatever breathing animals and burning candles remove” was given by

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Q. The following hypothesis, “Plants restore to the air whatever breathing animals and burning candles remove” was given by

Photosynthesis in Higher Plants

Solution:

• In $1770$ he performed a series of experiments that showed the essential role of air in the growth of green plants. Priestley discovered $O_2$ in $1774$.
• He experimented with a mint plant.
• Priestley observed that a candle burning in a closed space—a bell jar, soon gets extinguished. Similarly, a mouse would soon suffocate in a closed space.
• He concluded that a burning candle or an animal that breathe the air, both somehow, damage the air.
• But when he placed a mint plant in the same bell jar, he found that the mouse stayed alive and the candle continued to bum.
• Priestley hypothesis: Plants restore to the air whatever breathing animals and burning candles remove.