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to investigate the effect of light intensity on the rate of photosynthesis

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Biology lab report 16 Mohd Hafeez Bin Azman M03K Title: to investigate the effect of light intensity on the rate of photosynthesis Research question: Does light intensity affect the rate of photosynthesis? Hypothesis: Theoretically plants need light to undergo photosynthesis. At low light intensities, there is a shortage of the product of the light-dependent reactions. There fore if the light intensity is low, the rate of reaction will also be low. The hypothesis is that the rate of photosynthesis increases with the increasing light intensity and decrease with the decreasing light intensity. Variables: Independent --> distance between the source of light and the pond weed Dependent --> time taken for the colour of sodium bicarbonate solution to turn from deep red to purple Fixed --> the apparatus settings, the volume of sodium bicarbonate Solution (5 cc), the length of pond weed(5 cm) ...read more.


- - - - Data processing: From the experiment, there are no data that can be taken because there are no changes of colour on the bicarbonate indicator. There fore the experiment can be called a failure. Theoretically, the colour of the indicator should turn back from deep red to purple meaning there is oxygen released by the process of photosynthesis. But throughout the experiment, no changes happen to the indicator. For the controlled experiment, there are no changes of colour recorded; this is because without light, the light-dependent reaction of photosynthesis could not happen thus no oxygen is released. Oxygen is the substance that changes the colour of the bicarbonate indicator from deep red colour to purple Evaluation: From doing this experiment, some flaws that have altered the experiments result has been detected. * The length of the pondweed is insufficient. ...read more.


be increased so that there is enough time for the weed to released enough oxygen that will turn the indicator from deep red to purple. * The volume of the indicator should be decreased so that the colour changes of the indicator will be faster. The concentration of the indicator should also be reduced so that the colour changes would be faster due to the fact that the mole of the indicator is lesser than usual * The experiment should be done in a very dark place where there are no source of light because the present of other light source will alter the experiment's results Conclusion: The experiment was a failure so no data can be obtained. Therefore a conclusion cannot be done. Theoretically, the indicator will changes colour from deep red to purple because the process of photosynthesis. This process is theoretically said to be affected by the intensity of light. ?? ?? ?? ?? ...read more.

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