Take a potted plant with broad leaves. Take two strips of black paper and cut out a small square in the centre. Cover a part of two leaves with these papers and secure them with paper clips. Keep the plant in sunlight for 2-5 days. Observe the difference in the colour of the covered and the uncovered portions on the leaf. Perform iodine test on this leaf. Did the two parts show different results? Now take second leaf. Remove the strip and expose the covered part to the sunlight for 2-3 days and do the iodine test again. Describe your observations.
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You often see slimy, green patches in ponds or in other stagnant water bodies. These are generally formed by the growth of organisms called algae. Can you guess why algae are green in colour? They contain chlorophyll which gives them the green colour. Algae can also prepare their own food by photosynthesis.
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