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  4. Only the green part of the plants could release oxygen in the presence of sunlight during photosynthesis was explained by

Q. Only the green part of the plants could release oxygen in the presence of sunlight during photosynthesis was explained by

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Solution:

Jan Ingenhousz (1730-1799) showed that sunlight is essential to the plant process that purifies the air fouled by burning candles or breathing animals. Ingenhousz in an elegant experiment with an aquatic plant showed that in bright sunlight, small bubbles were formed around the green parts while in the dark they did not. Later he identified these bubbles to be of oxygen. Hence he showed that it is only the green part of the plants that could release oxygen.