Explanation (in paragraph):
To show that light is necessary for photosynthesis, a healthy potted plant is first kept in the dark for about 24 hours to remove any stored food from its leaves. Then, one leaf of the plant is selected and half of it is covered with black paper so that light cannot reach that part. The plant is placed in sunlight for a few hours. After this, the leaf is plucked and boiled in water to kill the cells, and then boiled in alcohol to remove the green colour. The leaf is washed and iodine solution is added. It is observed that the part of the leaf exposed to light turns blue-black, showing the presence of starch, while the covered part remains brown. This proves that starch is formed only in the presence of light, therefore light is necessary for photosynthesis.
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