Effect of temperature on the rate of photosynthesis
Hypothesis
As the temperature increases, the rate of photosynthesis will increase.
Explanation
Higher temperatures mean the enzymes involved in photosynthesis have more energy to move
around and collide with substrate molecules to form an enzyme-substrate complex.
Variables
Variable Description Method
IV The temperature is changed Using a thermometer
DV The rate of oxygen production Count the bubbles produced by the
plant
Control variables CO2 concentration Same concentration and volume of
sodium hydrogen carbonate used
Size of plant Cut to the same length
Time to count the bubbles Keep the time the same
Light intensity Use a lamp
Method
1. Set up a test tube with NaHCO3 in.
2. Use a ruler to measure the same length of Cambomba.
3. Put the pondweed into the test tube.
4. Place the tube containing the Cambomba at a measured distance from the lamp.
5. Note the temperature using a thermometer.
6. Count the bubbles produced by the plant over a period of time and record the number in a
table.
7. Repeat with the other temperatures.
