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Aim : To demonstrate the effect of light on photosynthesis
Materials Required : Wilmott’s Bubbler, Hydrilla plant, water, light source
Methodology Fill the Wilmotts Bubbler with water. Take a twig of
Hydrilla
plant. Cut the base with a sharp blade. Insert the plant in the bubler with
cut stem pointing the bubbler. Care should be taken that no air bubble get
trapped in the apparatus. Place the apparatus in shade. Count the number
of bubbles that arise from the stem per minute. Repeat the counting twice.
Now place the apparatus in light. Wait for 1 minute and then count the
number of bubbles that arise. Repeat the counting twice.
Result Air bubbles that arise from the cut surface is oxygen
produced by photosynthesis. More air
bubbles can be seen when apparatus is kept under direct light. That is direct light enhances
photosynthesis