how to investigate the effect of light intensity on the rate of photosynthesis

Question 1

1.

Answer 1

prepare some pond weed in a large boiling tube containing water, cut stem upwards

Question 2

2.

Answer 2

change intensity of light by altering the distance the light source is from the pond weed

Question 3

3.

Answer 3

do this by using a ruler in cm

Question 4

4.

Answer 4

position light source at first distance - allow pond weed to acclimatise to new light intensity before counting - ensure to do this of reach light intensity

Question 5

5.

Answer 5

measure the number of bubbles produced by the pond weed per minute

Question 6

6.

Answer 6

repeat each light intensity and calculate a mean

Question 7

7.

Answer 7

ensure control variables - temperature (use a heat screen or LED bulb), same light source, concentration of carbon dioxide