Title: Effect of Light intensity on the rate of Photosynthesis - Biology Notes for IGCSE 2014
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#41 Effect of Light intensity on the rate of Photosynthesis
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Content: Effect of Light intensity on the rate of Photosynthesis - Biology Notes for IGCSE 2014

#41 Effect of Light intensity on the rate of Photosynthesis
Plants need light energy to make the chemical energy needed to create carbohydrates. Increasing the light intensity will boost the speed of photosynthesis. However, at high light intensities the rate becomes constant. Experiment
Place a pond weed Elodea upside in a test tube containing water. Place the tube in a beaker of fresh water at 25°C. This helps to maintain a constant temperature around the pond weed. Place excess sodium bicarbonate (NaHCO3) in the water to give a constant saturated solution of CO2. Place the lamp (the only light source) at distance from the plant. Count the number of oxygen bubbles given off by the plant in 1 minute period. This is the rate of photosynthesis at that particular light intensity.