Photosynthesis practical

Question 1

Aim of the practical?

Answer 1

investigate the effect of light intensity on the rate of photosynthesis

Question 2

step 1

Answer 2

boiling tube 45cm hydrocarbonate - allow test tube to stand and shake incase air bubbles form

Question 3

step 2

Answer 3

cut pondweed 8cm long

Question 4

step 3

Answer 4

use forcteps to place pondweed into test tube carefully- don’t damage pondweed

Question 5

step 4

Answer 5

position boiling tube 10cm away from light- stand for 5 minutes- count number of bubbles emerging from cut end of stem- repeat experiment with different distances away from the light source

Question 6

What is the independent variable

Answer 6

distance from light source

Question 7

dependent variable

Answer 7

number of bubbles produced

Question 8

control variable

Answer 8

concentration of solution, temp, using same pondweed