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

Investigation into the effect of light intensity on the rate of photosynthesis.

Extracts from this document...


Investigation into the effect of light intensity on the rate of photosynthesis. Prediction I predict that the amount of oxygen produced will increase as the light intensity increases. "Sometimes light is a limiting factor. A plant may have lots of water and carbon dioxide, but it will not photosynthesise very fast if there is not enough light; increasing the light intensity will make photosynthesis faster." Concluding from this statement, light is one of the requirements of photosynthesis, so moving the light source closer and further away from the plant will give it varying degrees of light intensity. As the light is moved closer to the plant photosynthesis will speed up and eventually come to its highest point and level out. As the amount of carbon dioxide and the temperature also affect the plants rate of photosynthesis, the plant may have plenty of light but "cannot photosynthesise because it has run out of carbon dioxide or it is to cold for the enzymes to work properly." That's why it may level off. ...read more.


* Safety. I will make sure that the tank of water is not near any electrical appliances. I will also make sure the area around the experiment is clear and that there is nothing dangerous on the floor. * I will record my results in the following table: Test Distance of lamp away from beaker Volume of oxygen (mm) 1 2 3 1 2 3 1 2 3 1 2 Etc. Once I have collected all my results I will plot them on this graph to get the rate of photosynthesis, and how it differs when the lamp is moved. I am going to put all the results on one graph so it is easier to compare them and write up an evaluation. Amount of Oxygen Produced (MM) Distance of lamp away from beaker Results I was unable to conduct the experiment in the laboratory because there was not enough oxygen produced to make the results reliable Test Light intensity (%) ...read more.


Conclusion As the light intensity is increased the rate of photosynthesis also increase, so my prediction at the beginning of the experiment is correct. I also predicted that the rate of photosynthesis would come to its highest point and then level out. This is because the plant has plenty of light but it will eventually run out of carbon dioxide to photosynthesise any more. This theory also includes temperature and light, along with carbon dioxide they are the "limiting factors" of Photosynthesis. My graph did not level out because it always had plenty of carbon dioxide. Evaluation To evaluate my experiment I would say that it went well, but would have liked to carry out the experiment instead of using the computers. In my results table I found I needed to add an extra column entitled "rate of photosynthesis" so I was able to use that information later in my graphs. I also found it easier to use two graphs instead of one, as I used ICT to make my graphs. ...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. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    However, if the experiment needed to be more reliable (i.e. more statistically significant results on the chi-squared test, the more results there are the more reliable the conclusion is). A range of 20 or more concentrations would provide a very legitimate set of results.

  2. The effect of light intensity on the rate of photosynthesis

    Flowering plants have a green pigment called chlorophyll which can absorb some of these light rays and use their energy to build up the simple sugar, glucose , from carbon dioxide and water. The light energy is trapped as chemical energy in the glucose molecule.

  1. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    7 8 8 12.6 50 0 0 0 0 0 The results underlined and in bold are anomalous results as they are deemed to far from the other values recorded to be accurate. The anomalies from column 1 (first readings)

  2. Investigating the effect of temperature on the rate of photosynthesis

    In the actual experiment I will keep the distance between the lamp and experiment constant. It was difficult to keep the temperature of the water constant, to do this we had to add ice/water to keep the temperature constant. However this wasn't very accurate.

  1. Investigation To Find The Effect Of Temperature On The Rate Of Photosynthesis Of Elodea.

    for the plant. It is only when the rate of photosynthesis is greater than the rate of respiration that CO2 will be taken in and excess O2 given out. ie. In darkness O2 is taken in and CO2 is given out - there is no p/s; in dim light the

  2. Investigating the effect of Light Intensity on Elodea.

    This method would perhaps take longer to do, if the lamp were to be positioned far away from the plant the rate of photosynthesis would be much slower. It would take a considerable amount of time for 20 bubbles to produced at a length of 60cm, but only a

  1. Investigate the effect of light intensity on the rate of photosynthesis in an aquatic ...

    if the lamp was not present, it would not be wrong to say that photosynthesis would have ceased to take place within the lab at all. From this I have gained the knowledge that the original light within the lab (without the aid of the lamp)

  2. How temperature affects the rate of photosynthesis.

    Add 1g of Sodium hydrogen carbonate (NaHCO3) to ensure there is enough carbon dioxide for photosynthesis to occur. (The same amount of sodium hydrogen carbonate should be added to ensure fair test as the same amount of carbon dioxide will be released in all the test tubes and to eliminate it being as a limiting factor.)

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