Effect of Light Intensity on Photosynthesis in Elodea

Effect of Light Intensity on Photosynthesis in Elodea

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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
=======

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
==========

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.

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2.

Evaluation

This experiment was inaccurate. The lights in the science lab were on
so that would have increased the light intensity more than was needed.
Likewise the amount of carbon dioxide dissolved in the water was not
controlled so more carbon dioxide could have been in the water than
the other repeats making the test unfair and wrong.

I would improve the experiment by turning off all the lights in the
science lab so that the light intensity would be equal for every
repeat. I would also control the amount of carbon dioxide in the water
by using the same amount of water from the tap at almost the same
time, so there would be the same temperature, same amount of carbon
dioxide and I'd measure the amounts of water.

I found that all the results in Repeat 3 were anomalous as the results
in repeat 1 and 2 were almost running parallel with each other by
there results except for when repeat 2 went from 21 to 50 to 21 and up
to 90. All the results in repeat 1 and repeat 2 have made the final
result over 100 whereas repeat 3 had only just got beneath 100.

The quality of the evidence

The quality of the evidence is not fair. The experiment was not
completed fairly as the same piece of Elodea was used for each repeat
likewise the same water.

The data was not reliable, as the experiment was not fair as they'd
kept the lights on in the classroom giving more light to the
experiment and they did not measure the amount of carbon dioxide in
the water.



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