Lab Report - the one with trashbag

Lab Report – the one with trashbag

Hypothesis : A trashbag covering a plant would affect the rate of photosynthesis

Aim: To test whether light intensity affects the rate of photosynthesis

Approach : A trashbag is been covered over a plant and it is tested whether it affects the rate of photosynthesis

Apparatus : Datalogger x 1 , lamp x1 , oxygen sensor x3 , beaker x3

Materials : Trashbag x1 , Sodium hydrogen carbonate , hydrillas x3

Steps :

1 : Trashbag covered over hydrilla is placed inside a beaker of water

2: Put it in a dark area and wait for 20-30mins

3: Use oxygen sensor and connect it to the datalogger and into the beaker

4:Compare results with the other 2 beakers

5: Form a conclusion and check hypothesis

Experimental error : Did not allow hydrilla to adapt to the sodium hydrogen carbonate, oxygen sensor faulty etc .

Results : The amount of oxygen in the beaker with the hydrilla being covered by the trashbag decreases gradually. In which after 20 seconds, it started increasing for around 3 seconds. After that, it started going down again .

Conclusion : Amount of oxygen decreases which prove that the rate of photosynthesis is being affected by the trashbag covering over the plant .

Time/s	0	10	20	30	40
Amount of oxygen/g/L	8.5	5.5	4.4	4.2	4.0