Nightingale Middle School

SAMPLE SCIENCE PAPER

SAMPLE SCIENCE PAPER

Red vs. Green vs. Blue

Introduction:  Photosynthesis is the process that plants utilize to grow and produce energy.  I have always been interested in how it works.  Back in 7th grade, we learned that the process involves carbon dioxide, water and sunlight.  I would like to modify sunlight in my experiment.  When sunlight passes through a prism, we can see the beautiful rainbow colors contained in it.    I am going to use the colors red, green and blue out of the entire spectrum.  I would like to find out the effects these three colors have on plant growth.  I predict the color green will have the most influence over red and blue because the plants I chose contained lots of chlorophyll.  Chlorophyll gives plants their green color. 

Question: Under which color light; red, green or blue, will plants grow best?

Hypothesis:  If I grow plants under red, green and blue light, the plants under the green light will grow best.

Variable:  The color of the lights is the independent variable.  This will have an effect on plant growth, making plant growth the dependent variable

Materials: 

  1. Eight plants
  2. Four boxes
  3. Red, green, blue and transparent plastic bags
  4. Four 1-gallon planting pots
  5. Four quarts of plotting soil
  6. Ruler

 

Procedures:

Step 1. Fill each pot with potting soil.

Step 2. Plant two plants in each pot.

Step 3. Place one pot in each box.

Step 4. Cover each box with a different color plastic bag.

Step 5. Place all four pots in the same location.

Step 6. Water each pot when necessary.

Step 7.  Measure the height of each plant every day for 20 days.

Step 8. Record the data.

Step 9. Repeat step 6 to step 8 for twenty days.

Data

Day

Red (tall) cm

Green

Blue

Control

1

0

0

0

0

2

0

0

0

0

3

1

1

1

1

4

2

2

2

3

5

4

5

4

6

6

6

9

7

11

7

9

13

9

15

8

11

18

11

19

9

14

21

14

24

10

17

27

18

31

11

20

31

21

37

12

22

38

24

42

13

25

42

27

48

14

27

45

31

55

15

29

49

37

63

16

31

54

41

70

17

33

61

46

77

18

35

67

51

85

19

37

73

55

93

20

40

80

60

100

 

 

Results: Based on my data over 20 days, the average growth of red, green, and blue were 2 cm, 4 cm and 3 cm respectfully.  The control was 5 cm. 

Conclusion:  The purpose of the experiment was to find under what conditions plants grew the best.   My hypothesis was correct.  I predicted that plants would grow best under green color.  The best growing condition was green.  The worst was red.  However, when compared to the control, all the experimental conditions showed less growth.