Testing a leaf for starch experiment

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Title: Testing a leaf for starch

Date: February 20, 2012

Aim: To investigate the presence of starch in leaves.

Materials: 2 small leaves (one green, one yellow), beaker, test-tube, ethanol, water, iodine solution, Petri dish, forceps, tripod, wire gauze, dropper, boiling tube.

Method:

Two leaves were taken from a dicotyledonous plant, one with a fresh green color and the other with a pale yellow color. The green leaf was first immersed in boiling water for roughly 10 seconds. The leaf was removed and placed in a test-tube which was about one-third filled with ethanol and the test-tube was placed into the water bath. The leaf was boilt until became colorless and was then removed and rinsed with waster. The leaf was then placed in the Petri dish and a little iodine solution was porn unto it, it was then left alone for a few minutes. The iodine solution was then pourn off and the leaf was again rinsed in water. The reaction was observed and the process was repeated for the yellow leaf.

Observation:

The green leaf left a green solution in the ethanol while the yellow leaf left it