02: A student carried out an investigation to find the effect of carbon dioxide concentration on the rate of photosynthesis of an aquatic plant.
The apparatus that the student used is shown in Fig. 2.1. The student was advised to use a
light meter positioned at the same distance from the lamp as the pond plant. The student
counted the number of bubbles produces by the cut end of the stem.
de sodium
hydrogencarbonate
solution
thermometer
movable lamp
stop watch
water-bat
pond plant
ru
Fig. 2.1
(a) Explain why the student included the following in the apparatus.
) The beaker of water and the thermometer
(1)
The light meter and the ruler.