Investigating Whether Light Intensity Affects Photosynthesis


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Investigating Whether Light Intensity Affects Photosynthesis

Background Information:

Photosynthesis means “making through light” and occurs in the cells of
green plants, which are exposed to light.

The word equation for photosynthesis is:

Light

[IMAGE]Carbon Dioxide + Water Glucose + Oxygen

Chlorophyll

Although most of the glucose produced is converted into insoluble
starch for storage in the stem, leaves or roots, some is used
immediately by the plant to provide via respiration.

There are three things which limit the rate of photosynthesis, which
are temperature, carbon dioxide concentration and light intensity.
This is shown as when the temperature, carbon dioxide concentration
and light intensity increases, so does the rate of photosynthesis.

Prediction:

I think that at high light intensity the rate of photosynthesis will
increase because, as shown in my background information, as light
intensity increases, so does the rate of photosynthesis. I also think
at low light intensity the rate of photosynthesis will decrease. I
think this because, as proven in my background information, light is
needed for photosynthesis and means “making through light”.

Above is a graph to show what I predict my results will show about the
rate of photosynthesis as the light intensity increases. I think as
the light intensity increases the rate of photosynthesis will increase
because, as shown in my background information light is need to
photosynthesize.

I think eventually the graph will level out because the light
intensity will not be bale to increase anymore.

Preliminary work:

Below is a table showing our results after completing our preliminary
test.

Distance the light is from beaker (cm)

Bubble produced per minute

25

6

20

13

15

17

10

19

5

21

0

23

Using these results I can work out what I am going to use. Below is a
list:

How to Cite this Page

MLA Citation:
"Investigating Whether Light Intensity Affects Photosynthesis." 123HelpMe.com. 20 Oct 2017
    <http://www.123HelpMe.com/view.asp?id=150037>.
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* 300 ml of water

* 3 pieces of pondweed

* 3 spatulas of sodium hydroxide

* Light will be 25cm, 20cm, 15cm, 10cm, 5cm and 0cm distance from
the beaker.

* After one minute the beaker will be stirred twice.

* Use cold water.

* I will count the number of bubbles produced after one minute.

Diagram:

Equipment list:

* Bucket

* Test tube

* 500ml beaker

* Funnel

* 3 pieces of pondweed

* 300ml of water

* Lamp

* Spatula

* Stop watch

* Sodium Hydroxide

Safety points:

* Always wear goggles

* Clean any spilt water up so as not to fall when completing
experiment.

Fair test points:

* Use the same amount of water

* Use the same amount of pondweed

* use the same temperature of water

Method:

1. Collect equipment and set up as shown above.

2. Add three spatulas of sodium hydroxide and stir three times.

3. Count the bubbles produced for 1 minute then record result.

4. Repeat this for every 5cm the lamp is moved.

5. Repeat the whole experiment to make the results more reliable

6. Clear and tidy away all equipment.

Results:

1.

Distance the light is from beaker

Bubbles produced per minute

25

11

20

13

15

17

10

20

5

26

0

30

2.

Distance light is from beaker

Bubbles produced per minute

25

13

20

15

15

20

10

26

5

29

0

32

3.

Distance light is from beaker

Bubbles produced per minute

25

9

20

13

15

17

10

22

5

26

0

31

4.

Distance light is from beaker

Bubbles produced per minute

25

13

20

18

15

22

10

27

5

31

0

34

5.

Distance light is from beaker

Bubbles produced per minute

25

5

20

9

15

13

10

20

5

21

0

25

6.

Distance light is from beaker

Bubbles produced per minute

25

12

20

17

15

23

10

26

5

32

0

35

7.

Distance light is from beaker

Bubbles produced per minute

25

15

20

21

15

27

10

30

5

32

0

35

8.

Distance light is from beaker

Bubbles produced per minute

25

14

20

22

15

25

10

29

5

34

0

37

Repeat Results:

1.

Distance light is from beaker

Bubbles produced per minute

25

11

20

14

15

18

10

20

5

26

0

29

2.

Distance light is from beaker

Bubbles produced per minute

25

14

20

17

15

20

10

26

5

29

0

32

3.

Distance light is from beaker

Bubbles produced per minute

25

9

20

13

15

17

10

23

5

26

0

30

4.

Distance light is from beaker

Bubbles produced per minute

25

13

20

18

15

22

10

24

5

26

0

31


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