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(Grade A) Investigating Photosynthesis.doc

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Investigating Photosynthesis Aim The aim of this investigation is to find out how the amount of light (light intensity) affects the rate of photosynthesis. Dependent Variable Light intensity, distance, lamp and plant Control Variable Temperature, amount of pondweed, amount of sodium hydrogen carbonate, presence of Chlorophyll (catalyst), time Apparatus lamp ruler beaker funnel boiling tube sodium hydrogen carbonate pondweed water thermometer Method 1) add 200 cm of "pond" water and one spatula full of sodium hydrogen carbonate into a beaker 2) ...read more.


7) set up the lamp at 30 cm away from the beaker of water 8) wait 2-3 minutes for the plant to adjust to the new conditions 9) using a stopwatch, count the number of bubbles produced in a minute and record it down 10) measure and record the temperature of the water in the beaker regularly to ensure a fair test 11) repeat these measurements 3 times and calculate the average number of bubbles produced in a minute 12) repeat step (1-11) ...read more.


Average no. of bubbles produced (1 minute) Try 1 Try 2 Try 3 5 10 11 12 11 10 8 10 11 10 15 7 9 10 9 20 6 8 7 7 25 5 7 6 6 30 4 5 5 5 Description and Explanation The closer the lamp is to the pondweed, the higher the rate of bubbles produced. But as I moved the lamp 5 cm away from the plant each time, the rate of bubbles produced starts to decline significantly. The reason is because plants uses light to carry out photosynthesis which produces bubbles of gas-oxygen in the process. If the light intensity declines, the rate of photosynthesis at which the plants conducts will decline as well. ...read more.

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