• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

How Does Light Intensity Affect the Rate of Photosynthesis in Pond Weed?

Extracts from this document...


How Does Light Intensity Affect the Rate of Photosynthesis in Pond Weed? Prediction I predict that the higher the intensity of light, the quicker the rate of photosynthesis will be in pond weed. Chlorophyll is the chemical which absorbs light energy and passes it to the process of photosynthesis. This means that it acts as a catalyst upon plants for photosynthesis. Therefore, it can speed up the rate of reaction. So, if the light is not intense enough upon the chlorophyll, then it won't absorb enough light energy, which means that it won't activate photosynthesis. I also predict that as I move the lamp away from the pond weed, the intensity of light will reduce, thus reducing the amount of oxygen produced by the plant. ...read more.


25 33 30 22 35 19 40 15 45 15 50 14 55 11 60 8 65 7 70 6 75 6 80 6 The results show that when the intensity of light was high, then the rate of reaction of photosynthesis in pondweed will be quicker. This is because the results proved my prediction to be correct. Chlorophyll wasn't able to absorb enough light energy to be used for photosynthesis, when the lamp was far away. This is because the intensity of light wasn't as high as it was when the lamp was closer. So, when the lamp was 25cm away, the number of bubbles produced was 33, but when the lamp was 40cm away, the number of bubbles produced was 15. ...read more.


This may have been due to many different factors. The anomalies could have occurred due to inaccurate conduction of the experiment. I could have conducted my experiment incorrectly, by miscounting the number of bubbles of oxygen produced, because it was quite a tedious job. I could have also timed the experiment wrong, by 5 seconds or less. The distance of the lamp from the pondweed may have been measured inaccurately. To resolve these problems of inaccuracy, I have found a few solutions. I can't do much about miscounting the number of bubbles in the test tube, although, I could drink coffee beforehand to stop me falling asleep. I could also have used a stopwatch to time my experiment correctly. To prevent inaccurate measurement of the distance from the plant to the lamp, I could double check the distance. Bushra Wasty 11E Biology Coursework ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. How does light intensity affect the rate of photosynthesis

    There were air bubbles in the delivery tube that would affect the bubble that was made and the apparatus was very awkward to put together and maintain. I decided that I would use an alternative method to collect the oxygen.

  2. Investigate the factors, which affect photosynthesis.

    The formula that calculated the rate of photosynthesis is shown below: Rate of photosynthesis = Number of bubbles Time in which bubbles where counted. Safety precautions While performing the experiment many injurious substances and hazardous equipment were used. However the below safety precautions were taken into deliberation.

  1. Do different coloured wavelengths of light affect the rate of photosynthesis in Canadian Pond ...

    produced every thirty seconds for three minutes in the form of bubbles produced by the pond weed. I chose this time variable because it gave me six sets of results per filter. I chose not to use a variable for the temperature the experiment took place at because it was to difficult to keep the experiment at a steady temperature.

  2. How temperature affects the rate of photosynthesis.

    Enzyme activity is only increased between 0 oC and the optimum temperature of the enzyme (as shown by the general increasing trend shown by the graphs). Enzymes depend on substrate (reactant) molecules binding to their active sites so that a reaction can take place for and enzyme substrate complex can be formed and released.

  1. Investigating the factors, which affect the rate of photosynthesis in a pond plant.

    Glucose can also be converted into starch and stored. Both starch and sucrose can be turned back into glucose and used in respiration. Photosynthesis happens in the mesophyll cells of leaves. There are two kinds of mesophyll cells - palisade mesophyll and spongy mesophyll. The mesophyll cells contain tiny bodies called chloroplasts which contain a green chemical called chlorophyll.

  2. Photosyntesis in a Pond Weed.

    29 28 28.3 29 28 28 28.3 197 201 195 197.7 Materials: * Beaker * Test tube * Pond weed * Lamp * Meter rule * Thermometer * Sodium hydrogen carbonate * Apron * Light intensity box * Goggles * Timer Method: 1. Put on your apron and goggles 2.

  1. How does light intensity affect the rate of photosynthesis?

    and water at the same time, special care must be taken. As a precaution try not to drop any water onto the beaker in the light intensity investigation as it will be hot and may crack. Method Preliminary work... Take two green, healthy pieces of pondweed, with lots of leaves

  2. To investigate how light intensity affects the rate of photosynthesis of pond weed at ...

    the piece of plant the more leaves it will have and therefore the more photosynthesis it will perform and the more bubbles it will produce. - The time I measure the number of bubbles for will affect the rate of photosynthesis because the longer I time it for the more bubbles the plant will produce.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work