Aim: In this experiment we shall investigate how the rate of photosynthesis (measured by the increased volume of oxygen) is affected by changes of light intensity in water plants.
Hypothesis: I predict that as the intensity of light increases, so will the rate of photosynthesis. Furthermore, I hypothesise that if the light intensity increases, the rate of photosynthesis will increase at a proportional rate.
Variables:
Constant VariedMeasured
ShootLight intensityRate of photosynthesis
Number of lightsDistance between light and pondweedNumber of Bubbles
Water ------
Time between each result recording ------
Materials:
- Beaker almost full of water
- Pondweed
- 60 watt Lamp
- Ruler
- Stopwatch
- Short-stemmed Funnel
- Test Tube
-paper clip
-pure CO2
Method:
1. First clip that end of the pondweed that was not cut.
2. Then place a short-stemmed funnel over some pondweed in a beaker of water. Add pure CO2 to the beaker of water.
3. Fill a test tube with water and place it upside-down over the funnel stem.
4. Place the 60watt lamp at these distances away from