explain why you can't simply add iodine to an untreated Leaf to test for starch
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Only the parts that were green become blue/black with iodine solution, showing the importance of chlorophyll in photosynthesis. The parts without chlorophyll do not photosynthesize, and so they do not make starch and the iodine does not change colour.
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Answer:
Ruptures cell membranes to make starch granules in cytoplasm and chloroplasts accessible to iodine/potassium iodide solution. Cell membranes are selectively permeable and do not readily allow the penetration of iodine.
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