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Ef f ec t

of C n u arbo S n Dioxide on

rs e lfow

9th Grade Biology Research Project, May 2018 Research by Trista, Inderpal, and Antonella


Sunflower: Helianthus Annuus, live in large open areas like prairies or pastures.


Humans need energy. Its what powers most of everything we use in our everyday lives. But to generate that energy we have to use fossil fuels, natural gases, and petroleum. Fossil fuels emit carbon dioxide and other harmful air pollutants when burned. “These emissions lead to a wide variety of public health and environmental costs that are borne at the local, regional, national, and global levels�(UCS, 2016). The current known causes are the burning of fossil fuels and there emissions released into the atmosphere.

Research Question How does carbon dioxide affect plant growth.

Hypothesis If sunflowers are exposed to high levels of carbon dioxide, then the sunflowers wont grow.


Dependant Variable: Amount of sunflowers that grow.

Independent Variable:

Amount of carbon dioxide that enters the sunflowers ecosystem.

Length of Study: 3 days. Control Group:

6 sunflower plants in 3 different cups half full with soil, nothing added to them.

Experimental Group:

6 sunflower plants in 3 different cups half full with soil, and 15 milligrams of water daily.

Pre-data:

Collected by measuring the hight of all the plants on the first day.

Post-data:

Collected by measuring the hight of all the plants on the final day.


Red: Experimental Group Blue: Control Group


Results

Experimental Group: Pre-date: 0 cm tall Post-data: 16.3 cm avg. For all plants % difference: 1,630%

Control Group:

Pre-data: 0 cm tall Post-data: 6.3 cm avg. For all plants % difference: 630%

% difference in total: 1,000%

Our hypothesis was proven wrong. The experimental group grew significantly taller than the control group. Our results show that plants aren’t as affected by carbon dioxide exposure as much as we thought they were. Our experiment could have a few flaws like there wasn’t enough carbon dioxide in the container with the plants or one group had more light then the other.


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