By Julia DeVincenzi and Tatyana Dunn 3 rd Quarter 1 st Period Robert Louis Stevenson Middle School

Light is an electromagnet radiation that comes in waves. Light is an electromagnet radiation that comes in waves. Plants absorb light to produce fruits, flowers etc. Plants absorb light to produce fruits, flowers etc. They look green because they reflect green light, they don’t absorb it. They look green because they reflect green light, they don’t absorb it. Phytochrome is the proteins in a plant that allows it to sense the color of light. Phytochrome is the proteins in a plant that allows it to sense the color of light.

Our question: Does the color of light affect plant growth? Our question: Does the color of light affect plant growth? Our Hypothesis: If we create three wire domes and cover each with a different color of tissue paper (red, green and blue) and put a plant in each and we keep one plant in natural lighting, we predict that the green dome will help the plants grow the best. Our Hypothesis: If we create three wire domes and cover each with a different color of tissue paper (red, green and blue) and put a plant in each and we keep one plant in natural lighting, we predict that the green dome will help the plants grow the best. Constant Variables: Pots, soil, water, wire dome, plants (Italian Parsley), and sunlight Constant Variables: Pots, soil, water, wire dome, plants (Italian Parsley), and sunlight Experimental Variables: Color of tissue paper Experimental Variables: Color of tissue paper

a. 8 plants (Italian Parsley) b. 8 plastic cups c. metal wire d. duct tape e. 1/4 cup of water every other day f. soil (1 cup per plant) g. measuring cup h. ruler and camera to contrast growth i. tissue paper (red, green and blue)

a. Gather all materials from materials list b. Buy parsley plants from nursery (8) c. Make 3 domes with different color tissue paper d. Place 2 parsley plants into each dome e. Place another 2 parsley plants in natural light f. Water every 1-2 days with a ¼ cup of water g. Take pictures to compare growth and differences h. Observe growth patterns

Date DateNaturalRedGreenBlue First Day First Day 3/14 3/14 Tall, green and somewhat thick stem, some leaves 20 cm. high 20 cm. high Tall, green and somewhat thick stem, some leaves 19 cm. high 19 cm. high Tall, green and somewhat thick stem, some leaves 19 cm. high 19 cm. high Tall, green and somewhat thick stem, some leaves 18 cm. high 18 cm. high Week 1 Week 1 3/14-3/21 3/14-3/21 Standing tall and straight, lots of leaves 27 cm. high 27 cm. high Many leaves but stem is too skinny and plant droops 16 cm. drooping 33 cm. held up Stem is straight, lots of leaves but plant limbs droop 25 cm. high 25 cm. high Lots of leaves but stem is slightly tilted 27 cm. high 27 cm. high Week 2 Week 2 3/21-3/27 3/21-3/27 Tall, stem is slightly tilted, lots of leaves, thick stem 41 cm high 41 cm high Tall, top of stem and limbs droop, lots of leaves 41 cm drooping 44 cm held up Tall, stem tilts, lots of leaves but not towards middle 39 cm high Tall, stem is skinny and tilted, some leaves 32 cm high Week 3 Week 3 3/27-4/04 3/27-4/04 Tall, lots of leaves, thick stem and limbs 2ft. high 2ft. high Tall, stem is bent over, doesn’t support plant and droops 1ft. 24 cm 1ft. 24 cm Tall, but plant falls/bends over and doesn’t support plant and limbs 1ft. 24 cm 1ft. 24 cm Tall, stem falls near root, thin stem 1ft. 20cm 1ft. 20cm

We observed that the plants that had tissue paper over them weren’t getting enough sun and therefore not enough nutrients. The plant in natural light was getting sun directly and got it’s nutrients that it needed from the sun. In the end, when we counted all of the leaves on the plants, the plant in natural light was able to grow more leaves then the others.

Our Conclusion: In the end, our hypothesis was Incorrect. We predicted that the plant under the green tissue paper would grow the healthiest. We were incorrect because it did not get as many nutrients as the plants in natural light. If we were to change our hypothesis, we would predict that the plant in natural light would grow the healthiest. Something that we would change in our experiment was be more clear on the amount of water that we watered every other day. We discovered that as long as you do not grow your plants in artificial light, they will grow better then those that do. We recommend to farmers to grow your plants in natural light.

1.”How does color of light affect plant growth?” March 24, 1.”How does color of light affect plant growth?” March 24, 2.“Jasmine Flower” March 24, 2.“Jasmine Flower” March 24, Stern, Jamie “Parsley Plants,” April 19 3.Stern, Jamie “Parsley Plants,” April

We’d like to thank Kara Dunn, and Jeanne and Todd DeVincenzi for helping us get our materials. We’d also like to thank Mr. Pham for helping us with our experiment.