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  Ganongs light screen experiment

Ganong’s light screen experiment:

Light screen experiment of Ganong’s illustrates that light is necessary for photosynthesis. While a pot plant is reserved for 48 hours in dark room, the leaves turn into free from starch. So, dark treated plant is termed as destarched plant. Light screen of Ganong’s is a clip like instrument along with a tin foil disc comprising a star shaped opening by which light can enter. This closes the lower hollow cylindrical box type structure. The benefit of light screen is to permit free ventilation and at similar time it cuts off light. The light screen is set to a leaf of the destarched potted plant as displayed in the diagram. The whole experimental setup is located in sunlight for 4 to 6 hours.

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                                                      Diagram: Ganong’s light screen experiment

 

 

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