Light intensity effect photosynthesis required practical

Question 1

Method for light intensity effect rate of photosynthesis

Answer 1

Oxygen Production - Method

• light source is placed at a specific distance from the pondweed
• The pondweed is left to photosynthesise for a set amount of time. As it photosynthesises, the oxygen released will collect in a capillary tube
• At the end of the experiment, the syringe is used to draw the gas bubble in the tube up alongside a ruler & the length of the gas bubble is measured. This is proportional to the volume of O2 produced
• repeat with the light source at different distances from the pondweed

Question 2

How could you control the temperature of the experiment?

Answer 2

Water bath

Question 3

How can you ensure data is reliable?

Answer 3

Repeat the experiment. Remove outliers and calculate a mean.

Question 4

How does oxygen given off show increased rate of photosynthesis

Answer 4

Oxygen is product of photosynthesis

More oxygen increased rate of photosynthesis