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: 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. The gas should be checked to prove that it is indeed oxygen - relights a glowing splint. Repeat at different lower CO2 concentrations by using different dilutions of a saturated solution. Graph the results placing CO2 concentration on the x-axis. Explanation
The rate of photosynthesis increases linearly with increasing CO2 concentration (from point A to B ). The rate falls gradually, and at a certain CO2 concentration it stays constant (from point B to C).