How carbon dioxide can affect the rate of photosynthesis

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Aim: To investigate how carbon dioxide can affect the rate of photosynthesis.
Hypothesis: The rate of photosynthesis in the water plant hydrilla will change as the rate of carbon dioxide changes.
Background information: Photosynthesis
Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight. Autotrophs are organisms that are able to produce nutrients and organic compounds using inorganic materials. Examples of autotrophs are green plants, algae, bacteria, etc. Organisms which are capable to photosynthesize are called photoautotroph. The chloroplasts (plant cell that contains chlorophyll) in autotrophs trap light energy from the sun and use it to combine
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1 beaker
1 lamp
1 ruler
1 transparent plastic shield
1 glass funnel with plastic tubes to let the funnel sink to the bottom of the beaker which stabilizes the funnel
1 test tube
1 stopwatch
1 spatula
1 jar of sodium hydrogen carbonate
1 balance
1 hydrilla (a type of water plant)
Set up:

Closer look at the beaker: Method/Procedure:
1. Set up: Measure the amount of sodium hydrogen carbonate (2, 4, 6, 8, 10g) to be mixed with water in the beaker. This is the only independent variable in this experiment.
2. Set up: Measure and pour 650ml of water into a beaker and mix it with sodium hydrogen carbonate using a stirring rod until all the sodium hydrogen carbonate has dissolved into the water.
3. Set up: Place the beaker in front of a lamp covered with a transparent plastic shield.
4. Recording data: Measure the distance between the lamp and the beaker. It should be 70cm at all times because it is a control variable. This cannot be changed because light intensity affects the rate of photosynthesis. If the plant is too close to the lamp, the results would be most affect by light intensity instead of carbon dioxide and the results would not be accurate. 5. Set up: Choose a hydrilla and put it into a funnel with plastic tubes and cut the end of the hydrilla’s stem to let bubble came out of the stem when conducting the experiment.Then take it out from the funnel’s narrow opening. Place the
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