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Read the information below about testing a leaf with iodine solution. |
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Put the leaf in boiling water for 30 seconds. Carefully remove the leaf from the water and put it into a boiling tube which contains methylated spirits. Heat the boiling tube in a water bath for 5 minutes. Then wash the leaf and spread it onto a petri dish. Add a few drops of iodine solution. |
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| a) |
Draw a line from each step of testing a leaf with iodine solution, to the purpose of that step. One of the purposes is not needed.
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b)
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If the iodine solution turned blue-black, what substance is present in the leaf? ____________________
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c)
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A leaf was removed from a plant and left beside the plant for a week. Explain what would happen if this leaf was now tested with iodine solution.
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