Biology Photosynthesis Lab

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Biology lab AIM: To test a leaf for starch APPARATUS/MATERIALS : * bunsen burner, tripod stand, wire gauze(OR 90oC electric water bath OR hot plate) * 250 cm3 beaker * boiling tube * anti- bumping granules * forceps * test tube holder * white tile * leaf to be tested (hibiscus leaves are excellent) * 90% ethanol * iodine/potassium iodide solution PROCEDURE: The video above shows the steps in Testing a Leaf for the Presence of Starch. The Procedure outlined below is slightly different. 1. Remove a green leaf fom a plant that has been exposed to sunlight for a few hours 2. Half-fill a 250cm3 beaker with water. Heat the water until it boils. Keep the water at boiling point. 3. Use the forceps to place…show more content…
* To improve this experiment, the plant needs to be de-starched, and the leaves tested for the presence of starch. * Once it is demonstrated that all starch has been utilized or removed, photosynthesis is allowed to take place by exposing the plant to sunlight. * The leaves of the plant are now tested for the presence of starch. * If starch is present, then it has been synthesized by photosynthesis. We can then conclude that the presence of starch indicates that photosynthesis has taken place

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