What process do you follow in the laboratory to study the presence of starch in leaves simply
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Remove a green leaf from a plant that has been exposed to sunlight for a few hoursHalf-fill a 250cm3 beaker with water. Heat the water until it boils. Keep the water at boiling point.Use the forceps to place the leaf in the boiling water. Boil for 2 minutes.Turn off the Bunsen Burner. (If you are using a heat source without a naked flame - electric water bath or hot plate - this step is unnecessary.)Place the boiled leaf in a boiling tube containing 90% ethanol.Place the boiling tube in hot water and boil for 10 minutes or until the leaf decolourizes. ( It may be necessary to replace the ethanol)Gently remove the leaf and wash with a fine trickle of cold tap water.Spread the leaf evenly on a white tile.Add a few drops of iodine/potassium iodide solution to the leaf and note any observations.
Remove a green leaf from a plant that has been exposed to sunlight for a few hoursHalf-fill a 250cm3 beaker with water. Heat the water until it boils. Keep the water at boiling point.Use the forceps to place the leaf in the boiling water. Boil for 2 minutes.Turn off the Bunsen Burner. (If you are using a heat source without a naked flame - electric water bath or hot plate - this step is unnecessary.)Place the boiled leaf in a boiling tube containing 90% ethanol.Place the boiling tube in hot water and boil for 10 minutes or until the leaf decolourizes. ( It may be necessary to replace the ethanol)Gently remove the leaf and wash with a fine trickle of cold tap water.Spread the leaf evenly on a white tile.Add a few drops of iodine/potassium iodide solution to the leaf and note any observations.
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