Term paper on Topic Photosynthesis Effect Of Carbon Dioxide

Topic Photosynthesis Effect Of Carbon Dioxide Essays

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Background Information:

Photosynthesis is a chemical process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. The products resulting from photosynthesis are glucose, oxygen gas and water. Factors that affect the rate of photosynthesis include water, carbon dioxide (CO2) concentration, temperature, light intensity and inorganic ions. A limiting factor is the factor that is in the least amount at any given time in a reaction. The amount of water available to the plant will affect the rate of photosynthesis. If the plant does not have enough water, the plant's stomata will shut and the plant will be deprived of CO2. Carbon dioxide concentration will directly affect the rate of photosynthesis as it is used in the photosynthesis reaction. It is also easy to change the amount of carbon dioxide that the plant receives.

Aim: To investigate the effect of carbon dioxide (CO2) concentration on the rate of photosynthesis.

Apparatus and Materials:

Elodea, syringe, scissors, beaker, distilled water, light source, tweezers, graph paper, capillary tube, tap, retort stand, sodium hydrogen carbonate.

Method:

1. The Elodea was cut at internodes approximately 5 cm long.

2. These pieces of plants were placed in a well-illuminated tube of distilled water for approximately 3 minutes.

3. The two pieces that bubbled most rapidly and regularly were selected.

4. The selected pieces were placed into the barrel of the syringe.

5. The syringe was filled with aerated distilled water and the plunger was replaced.

6. The piece of graph paper provided, was used to calibrate the capillary tube.

7. The syringe was inverted and any air that might have been present was expelled.

8. The rubber tubing was used to attach a length of capillary tube to the nozzle of the syringe.

9. The plunger was gently pushed to force water into the tip of the capillary tube.

10. A retort stand was used to secure apparatus.

11. The lamp was placed 10 cm from the syringe and the pondweed was allowed to equilibrate.

12. The distance moved by the meniscus was recorded over 5 minutes.

13. The apparatus was kept and two more readings were recorded.

14. The rate of oxygen production was calculated using the formula below. Volume of Oxygen produced = distance moved x πr2

15. The procedure was repeated using the various concentrations of sodium hydrogen carbonate solutions.

16. The results were recorded in a suitable table.

17. A line graph was plotted to...

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