Labelled diagram of Experimental set up a) with potassium hydroxide b) without potassium hydroxide
Labelled diagram of Experimental set up a) with potassium hydroxide b) without potassium hydroxide: Take two healthy potted plants of about the same size. Keep them in a dark room for at least three days. Now place both plant on a separate glass plate. Place a watch glass containing potassium hydroxide next to the plant.
Potassium hydroxide is used because it absorbs carbon dioxide. Cover both plants with separate pots. Use Vaseline to seal the bottom of the jar so that the set up is airtight. Keep both the plants in the environment of sunlight for about 2 hours. Remove a leaf from each plant and check for the presence of starch as above.
As a result, leaves of plants exposed to sunlight with potassium hydroxide watch glass will show less starch content and leaves of plants exposed to sunlight without potassium hydroxide will show more starch content.
Discussion in video with function below –