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Ganong's light screen experiment |
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Answer» Ganong's light screen experiment demonstrates that light is essential for photosynthesis. 1. When a pot plant is kept for 48 hours in dark room, the leaves become free from starch.2. Thus dark treated plant is called destarched plant. 3. Ganong's light screen is a clip like instrument with a tin foil disc having a star shaped opening through which light can enter. 4.This closes the lower hollow cylindrical box like structure. The advantage of light screen is to allow free ventilation and at the same time it cuts off light. 5.The light screen is fixed to a leaf of the destarched potted plant as shown in the figure. The entire experimental setup is placed in sunlight for 4 to 6 hours. 6. The leaf subjected for experiment is tested for starch. 7. Only the star shaped part of the leaf exposed to the sunlight turns blue. The Ganong's light screen experiment demonstrates that light is essential for photosynthesis. thank u |
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