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Rate of photosynthesis

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Rate of Photosynthesis Planning Introduction Photosynthesis is the process whereby plants and certain photoautotroph make food using carbon dioxide and water. When both (carbon dioxide and water) are combined, they make the food; glucose as well as oxygen, given off as a by-product. The above description of photosynthesis can be analysed in the equation below: BALANCED CHEMICAL EQUATION 6CO2 + 6H2O=C6H12O6 + 6O2 WORD EQUATION Carbon Dioxide + Water=Glucose + Oxygen Factors that affect photosynthesis: LIGHT: insufficient light slows down the rate of photosynthesis CARBON DIOXIDE: similarly, inadequate quantity of carbon dioxide slows down the rate of photosynthesis. TEMPERATURE: temperature should not be too cold nor too hot. Aim My aim is to investigate whether the factor 'light', has an affect on the rate of photosynthesis. This will be observed by counting the number of oxygen bubbles given off. Apparatus * Metre rule * 5cm Canadian pondweed clipped on a paperclip * Beaker * Lamp, with 60 watts bulb * Water Hypothesis It is predicted that, the more light intensity the higher the rate of photosynthesis, providing that the temperature is not too cold or too hot. ...read more.


The table below is the result collected: Distance intervalled (cm) No. of O2 bubbles given off 20 25 40 21 60 18 80 15 100 13 120 10 The above are the results I have collected throughout the experiment. All the results above cannot be very reliable as I haven't repeated the experiment and doing so will be a waste of time. However, I will get results from two colleagues so that I can compare they're data with mine. They also used 5cm Canadian pondweed clipped on a paperclip and a lamp, with 60 watts bulb. The table below are my colleagues's result: Colleague 1 Distance intervalled (cm) No. of O2 bubbles given off 20 26 40 21 60 20 80 16 100 13 120 10 Colleague2 Distance intervalled (cm) No. of O2 bubbles given off 20 24 40 21 60 19 80 15 100 12 120 10 The above results can be represented as line graphs to see if there were any anomalies. The graphs almost look alike, suggesting that there were no anomalies and ultimately my results are very reliable. ...read more.


I will need to find the value of y and x and then divide y by x to acquire the gradient. The value of y is 5 bubbles and the value of x is 20cm. 5/20=0.25. 0.25 is the gradient. Finding the gradient can now help me to find the value of any given distance (cm). Evaluation My method was a suitable one but yet there were many satisfactory notes regarding it. The reason why it was suitable because this experiment was a successful one. However, the satisfactory notes are that my results could have been more accurate, by using another colleague's results thus increasing the chance of accuracy. As well as that, this experiment could have been improved. The ways of improving it was, collecting the whole result using sensors and data could have been recorded by a computer as this would have given very accurate data and it does not include human interference i.e.: results would have been collected automatically by a computer. This however was impossible due to insufficient funds. I could have extended this investigation, to see the other variables affecting the rate of photosynthesis i.e.: temperature, carbon diocide. ?? ?? ?? ?? Ruhul Amin Choudory Biology ...read more.

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