What factors might affect the rate of production of oxygen by plant?

Light Intensity is to be the Variable Explored in this Investigation.

Think about how you can change this variable.

Escalating or Reducing the distance from the light source to the plant can vary the light intensity.

What would you do to other variables?

Equipment

Pond Weed

Lamp

Stop Clock

Meter Ruler

Plan

A piece of pondweed will be cut and placed into a beaker containing water and sodium hydrogen carbonate. A lamp will be shined on to the pondweed and the amount of foam released from the plant will be counted. The lamp will be adjusted to different distance from the plant to try and obtain different results.

Results

Distance of Lamp from Apparatus

Number of Gas Bubbles/ Minute

Group A

Group B

Group C

Group D

Average

Lamp Off

0

0

0

0

0

00 cm

0

2

1

0

3

50 cm

9

39

26

0

24

30 cm

41

60

53

42

42

0 cm

59

Over 100

79

60

Over 75

Sadeck Amin 01/05/07