Title: Effect of Light Colour on the Rate of Photosynthesis
Headings: Effect of Light Colour on the Rate of Photosynthesis
Effect of Light Colour on the Rate of Photosynthesis
The effect of Light Colour on the Rate of Photosynthesis
To what extent does the colour of light have on the rate of photosynthesis on Cabomba Aquatica plants?
Background knowledge:
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6CO2 + 6H2O ïƒ C6H12O6 + 6O2
Hypothesis:
Variables:
Preliminary results:
Apparatus:
Method:
Data collection and Processing (Quantitative and Qualitative data):
Measures and average number of bubbles produced
Qualitative Data:
Average rate of photosynthetic reaction
Standard deviation from the mean:
Interpretation of results:
Conclusion:
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Content: This investigation will be focusing on which wavelengths of visible light, colour of light, has the highest rate of photosynthesis. It is safe to assume that green would have to lowest rate of photosynthesis because it is reflected by the leaves of plants and red/violet would have the highest rate of photosynthesis. Hypothesis: I hypothesise that the rate of photosynthesis will be less for the green light whereas lights such as red and violet will have the fastest rate of photosynthesis. Variables: Variable Type
Variable
How it is controlled/Managed
Why it is controlled/Manage
Independent
Colour/Wavelength of light
I will change the colour of the light using 5 different colours including white light
To determine how the wavelength of light affects the rate of photosynthesis the most
Dependent
The rate the Cabomba flower synthesises
N/A
N/A
Control
Light intensity
The bulb will be kept at 5cm away from the test tube containing the Cabomba flower at all times
Keeping the light intensity the same means it will have no additional effect on the rate of photosynthesis. A change of light intensity would result in a change of photosynthesis rate. Control
Room temperature ºC
The room temperature will be kept the same for the duration of the investigation of the experiment by ensuring there are no windows open, air conditioners on or heaters being used
By doing so I will be able to keep the room temperature relatively the same throughout the experiment reducing the effect of temperature increase or decrease on the rate of photosynthesis. Control
Light bulb
The same 100W light bulb will be used throughout the investigation
Different light bulbs may have different light intensities therefore using the same light bulb eradicates the issue of dealing with different light intensities that could affect the rate of reaction
Control
Concentration of Sodium Hydrogen Carbonate (NaHCO 3 )
Ensuring the same concentration of NaHCO 3 is used in the experiment and the source remains the same
Concentrations of Sodium Hydrogen Carbonate could have an effect on the rate of photosynthesis as it provides necessary carbon dioxide for photosynthesis so keeping the concentration the same eradicate that issue
Control
Type of leaves and size
The same sample of plant will be used throughout the duration of the experiment
Different plants may photosynthesise at different rates and different sized samples may also affect the rate of photosynthesis. Different leaves on plants absorb a different number of visible light wavelengths resulting in a different rate of photosynthesis.