how would you demonstrate that sunlight is necessary for photosynthesis?
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To prove the necessity of sunlight in photosynthesis following steps need to do. Take a plant with destarched leaf. Leaf is partially covered with black paper on which a design is cut. Expose this plant to sunlight for few hours and perform a starch test with iodine solution. Observation-.
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The leaf which turned blue-black is a leaf which is placed in sunlight, and photosynthesis occurred and starch was produced. - So starch is produced only in the leaves which are exposed to sunlight, and this proves that sunlight is very essential for plants to do photosynthesis.
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