By Elessia Stel and Vida Jaffe 3rd Quarter 1st Period RLS Middle School

What is the effect of carbon dioxide on sweet pea plant growth? We think that the sweet peas grown with carbon dioxide will grow faster and healthier. Constant Variables: Sweet Peas, soil, pots, and water. Experimental Variables: Carbon Dioxide and Oxygen. What is the effect of carbon dioxide on sweet pea plant growth? We think that the sweet peas grown with carbon dioxide will grow faster and healthier. Constant Variables: Sweet Peas, soil, pots, and water. Experimental Variables: Carbon Dioxide and Oxygen.

Background Information: Sweet pea: A climbing annual plant of the pea family, with butterfly- shaped flowers Carbon Dioxide: A heavy, colorless, odorless gas, heavier than air Oxygen: A colorless, odorless, tasteless, gaseous chemical element that occurs free in the atmosphere Background Information: Sweet pea: A climbing annual plant of the pea family, with butterfly- shaped flowers Carbon Dioxide: A heavy, colorless, odorless gas, heavier than air Oxygen: A colorless, odorless, tasteless, gaseous chemical element that occurs free in the atmosphere

4 sweet pea plants 4 pots 2 ziploc bags 6 cups of soil 700 ml. of water CO2 from car Rubber gloves (amount may vary)

Procedure  Buy 4 sweet pea plants and 4 pots  Put sweet peas in 1 1/2 cups of soil  Put 2 of the plants into clear ziploc bags  Fill a rubber glove with car exhaust (Put the glove on the tail pipe. Turn on the car for just a second. The glove will inflate. Fill the ziploc bags with the carbon dioxide.)  Observe and refill bags with CO2 each week, and water when necessary  Buy 4 sweet pea plants and 4 pots  Put sweet peas in 1 1/2 cups of soil  Put 2 of the plants into clear ziploc bags  Fill a rubber glove with car exhaust (Put the glove on the tail pipe. Turn on the car for just a second. The glove will inflate. Fill the ziploc bags with the carbon dioxide.)  Observe and refill bags with CO2 each week, and water when necessary

Oxygen 1 CO2 1 Oxygen 2 CO2 2 3/8/09 Green, fuzzy, few leaves, healthy 8 1/2 in. tall Green, fuzzy, few leaves, healthy 8 1/2 in. tall Green, fuzzy, few leaves, healthy 6 in. tall Green, fuzzy, few leaves, healthy 6 in. tall 3/15/09 Taller, green, one or two yellow leaves 13 in. tall Taller, top half is green and bottom half is yellow 10 1/2 in. tall Taller, green, one or two yellow leaves 11 1/2 in. tall Taller, top half is green and bottom is yellow 8in. tall 3/22/09 Leaves look dried out, but soil is still wet, broken stem 16 in. tall Moldy, dried out, unhealthy, brown leaves, slimy, strong odor 13 in. tall Roots showing, fairly healthy 15 in. tall Brown moldy leaves, slimy, strong odor 8 in. tall 

Our hypothesis was incorrect because the sweet peas grown in the oxygen grew faster and healthier than the sweet peas grown in CO2. If we were to do our project again we would water the sweet peas more often. Our new hypothesis: We think that the sweet peas grown in oxygen will grow faster and healthier than the ones in the CO2. Our recommendation to sweet pea growers is to grow them in oxygen.

1.Oxygen. March 5, Sweet pea. March 5, Carbon dioxide. March 5, e e e

o We would like to thank Tim and Maria Stel for helping us get the CO2 from the car whenever we needed it o We would also like to thank Mr. Pham for explaining how to get the CO2 from the car