Title: Effect of Carbon Dioxide on the Rate of Photosynthesis - Biology Notes for IGCSE 2014
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# 43 Effect of Carbon Dioxide on the Rate of Photosynthesis
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Content: Effect of Carbon Dioxide on the Rate of Photosynthesis - Biology Notes for IGCSE 2014

# 43 Effect of Carbon Dioxide on the Rate of Photosynthesis
When the concentration of CO2 is low the rate of photosynthesis is also low. ( the plant has to spend time waiting for more CO2 to arrive). Increasing the concentration of CO2 increases the rate of photosynthesis. Experiment
Place a pond weed Elodea upside in a test tube containing water at 25°C. Place the tube in a beaker of fresh water. Place excess sodium bicarbonate (NaHCO3) in the water to give a constant saturated solution of CO2. Place the lamp (the only light source) at a fixed distance from the plant. Maintain the room temperature at 20°C. Count the number of oxygen bubbles given off by the plant in a one -minute period. This is the rate of photosynthesis at that particular concentration of CO2.