Effect of Light Intensity on Photosynthesis in Elodea

Effect of Light Intensity on Photosynthesis in Elodea

Prediction

I predict that as the light intensity doubles the number of bubbles

produced per minute will double

Results

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Distance from beaker (cm)

Light Intensity

Number of bubbles

Produced Per Minute

Repeat 1

Repeat 2

Repeat 3

100

0.01

9

10

10

75

0.02

16

17

15

50

0.04

25

21

23

30

0.1

32

50

44

20

0.3

46

21

47

15

0.4

92

90

88

10

1

104

90

94

9

1.2

111

102

96

Conclusion

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Figure 1 shows that repeat 1 rises steadily then when light intensity

is at 0.4, 1, 1.2 it rises rapidly then will slowly level off as you

cannot acquire anymore bubbles from the Elodea. Figure 1 likewise also

shows that Repeat 2 rises slowly then goes down rapidly than it rises

rapidly again and levels off. Figure 1 also shows those repeat 3 rises

slowly and levels off.

When the Light Intensity rises and the distance from the beaker moves

closer to the light the Elodea produces more bubbles of carbon dioxide

rises until there is no more carbon dioxide in the water or in the

Elodea so that is why the results in figure 1 levels off.

The results show that my initial idea was correct as the distance from

the beaker is moved towards the light the results of repeat 1,2 and 3

proceed higher. Repeat 3 has a increased gradual results than repeat 1

and repeat 2 who are other 100 by distance from beaker was 9cm and the

light intensity was 1.