Aims : How light intensity can affect a plant from photosynthesizing.
Hypothesis : The plant can still photosynthesize as there is no restriction of light.
Approach : There will be a total of 3 set-ups. Place hydrilla into a beaker each and place it under the lamp.
( cover two with translucent / opaque. beaker 2 - translucent. beaker 3 - opaque)
wait for 20 - 30 minutes , record the results.
Apparatus : 1 datalogger
3 oxygen sensor
3 beakers
1 lamp
Materials : 3 hydrilla plant
Sodium Hydrogen Carbonate
Variables : type of plant , type of lamp ( colour of light ) ,
heat of the lamp , surroundings.
Procedure : 1) place the hydrilla into the beaker half filled with tapwater.
2) mix two teaspoon of Sodium Hydrogen Carbonate and wait
for 5-10 minutes for it to adapt.
3) place the beaker under the lamp for about 20 - 30 minutes.
4) place the oxygen sensor into the beaker and start recording the results for 50 seconds.
Conclusion : the graph showed that the plant's rate of photosynthesis is uneven even though it wasnt covered.
it went down slightly but rose at 20 seconds but fell at 25 seconds , then it rises again at 26 - 27
seconds. it goes down again slowly in steps , rises , and falls again continuously.
experimental error : the inaccuracy of the results is because we did not let the hydrilla adapt to the
Sodium Hydrogen Carbonate for a short period of time.
Discussions : the inaccuracy of the results shown , was because we did not let it adapt for a while.
another error could be that we did not cover it at all , which allowed the oxygen to go into the
beaker. is it right or wrong to say that ?
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