photosynthesis

Cards (5)

step 1
source of white light is placed at a specific distance from the pondweed
step 2
pondweed is left to photosynthesise for a set amount of time
as it photosynthesises the oxygen released will collect in the capillary tube
step 3
at the end, the syringe is used to draw the gas bubble in the tube up alongside a ruler and the length of gas bubble is measured.
proportional to the volume of oxygen produced
variables
control - temperature, time left to photosynthesise
experiment is repeated twice with the light source at the same distance and the mean volume of oxygen produced is calculated
experiment is repeated with the light source at different distances from the pondweed