Aim: The effects different colours have on plants.
Hypothesis: I will find a difference in the amount of oxygen bubbles produced by the plants. If the rate photosynthesis increases more oxygen bubbles will be produced. I think that the plant exposed to green light will not be able to photosynthesize. As the the colours plants absorb are all the colour of white light except green light.
Theory: Plants will not absorb the green light as the colour of their leaves are green. Colours which get reflected into our eyes are reflected, hence the plants will not be able to absorb green light.
Method: The independent variable is the different coloured light filters and the dependent variable are the oxygen bubbles produced by the plant.
Other possible variables: They are the source of light and the amount of carbondioxide. We will turn off the lights and the only light source available will be a torchlight. I will be measuring the amount of oxygen bubble produced by the plant.
Materials: One hydrillas, three test-tube(1) , three other bigger tube (2) able to let test-tube (1) fit in , 3 filters ( red, blue and green ), 3 retort stands,
Things to note: the hydrilla must stay constant to avoid any inaccurate results.
Steps :
1. Fill test-tube (2) with water to keep the heat in
2. Fill test-tube (1) up with water
3. Tighten test-tube (1) to the retort stands
4. Adjust until test-tube (1) touches the base of test-tube (2)
5. Place the torch light in front of the test-tubes
6. Start by using the red filter
7. Put the hydrilla into test-tube (1)
8. Let the plant adjust to the water for about a minute
9. Count the bubbles which comes out from the plant for about 3 minutes
10. Observe and write down the number of bubbles
11. Repeat the step with the other colours ( blue and green )
