How would you show that light is necessary for oxygen production ? please tell small ans.
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Jan Ingenhousz placed plants under water and watched. When placed in the dark, plants produced no gases. When placed in direct sunlight the leaves released tiny bubbles of gas. The gas that accumulated in the container was able to re-light a glowing splint, indicating that it was oxygen. Ingenhousz repeated his experiment many times, with many different species. They all produced oxygen gas. To show that it is the light energy and not the heat of sunlight which is necessary he repeated the experiment with leaves placed near a fire. He established that the production of oxygen was a universal process for which plants need light.
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