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Question 3:, How would you test the presence of starch in leaves?, , Answer:, Experiment to test the presence of starch in leaves:, , Take two healthy green potted plants of the same type. Keep one potted plant in a dark, room for one or two days in order to remove all the starch from the leaves. Keep the, other plant in sunlight. Now, take one leaf from each potted plant and put a few drops of, iodine solution on them. Then note down the observation., , Plants kept in light and dark conditions, , No blue black colour will be observed on the leaves of the plant kept in the dark room., This indicates the absence of starch. Blue black colour will be observed on the leaves of, the plant kept in sunlight. This indicates the presence of starch., , Question 4:, , Give a brief description of the process of synthesis of food in green plants., , Answer:, , Photosynthesis is defined as the process in which the chlorophyll-containing plant cells, synthesise food in the form of carbohydrates, using carbon dioxide and water in the, presence of solar energy.