Priestley's Experiments & Plant Gas Exchange — NEET Biology
📚 Practice ConceptJoseph Priestley (1733-1804) in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. Priestley, you may recall, discovered oxygen in 1774. 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 burn. Priestley hypothesised as follows: Plants restore to the air whatever breathing animals and burning candles remove.
Arrange the following major discoveries in the understanding of photosynthesis in chronological order from earliest to most recent: A. Demonstration that plants restore the quality of air. B. Proof that sunlight is indispensable for oxygen release by green plant parts. C. Evidence for glucose (starch) formation in plants and location of chlorophyll. D. Description of the first action spectrum of photosynthesis using filamentous algae and bacteria. E. Proposal that oxygen evolved during photosynthesis originates from water. F. Mapping of the pathway of carbon assimilation using C14.
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