The Effect of Carbon Dioxide Concentration On The Rate of Photosynthesis.

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Sophie Louise Beard

The Effect of Carbon Dioxide Concentration

On The Rate of Photosynthesis

Aim

To investigate the effect of carbon dioxide concentration on the rate of photosynthesis.

Prediction

I predict the higher the carbon dioxide concentration (sodium hydrogen carbonate solution concentration) the faster and higher the rate of photosynthesis will increase meaning more oxygen produced (more O bubbles given off) over a period of time [2 minutes]. The amount of carbon dioxide taken in I predict will be proportional to the amount of oxygen given out.

E.g.

6CO +6H O --> C H O +6O

As the amount of CO O I predict the graph will look something like this

At the end of the graph, it will eventually level off and stop producing oxygen due to the limiting factors.

Diagram

Variables

Things we could change which would effect our results are -:

* Amount of light intensity

* Amount of carbon dioxide(sodium hydrogen carbonate solution molar)

* Different conditions (temperature)

* Amount of pond weed

We are going to change the sodium hydrogen carbonate solution concentration/molar to look at the effect the amount of carbon dioxide has on the rate of photosynthesis. Everything else will be kept the same.
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Safety

Be careful when handling glass and allow the lamp to cool before packing it away or touching.

Keep the area your working in clean and tidy; clean up any spillages.

Apparatus

* Lamp

* Beaker

* Test tube

* Measuring cylinder

* Pond weed

* Sodium hydrogen carbonate (variety of molars)

* Distilled water

* Plaster-cine

* Stop watch

Plan

. Set up as shown in diagram.

2. Leave pond weed to adapt to temperature in water bath for 4 minutes.

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**** A good plan and clear understanding of relevant theory shown. Occasionally more precise use of scientific terms would have been helpful.