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

An experiment to see how light intensity affects the photosynthesis of a plant.

Extracts from this document...

Introduction

An experiment to see how light intensity affects the photosynthesis of a plant. Introduction The aim of this experiment is to determine whether or not the intensity of light will affect the rate of photosynthesis in a plant. In order to do this, I will place pondweed in different light intensities, and observe the amount of oxygen that is given off. Hypothesis I predict that as the intensity of light increases, so will the rates of photosynthesis. Furthermore, if the light intensity increases the rate of photosynthesis will increase at a steady rate until a certain 'peak' is reached, and then the rate will no longer increase. Photosynthesis will only occur in the presence of light. It takes place in the chloroplasts of green plant cells. It can be defined as the production of simple sugars from carbon dioxide and water, which causes the release of sugar and oxygen. The chemical equation for this is the following: The reason that light intensity will affect the rate of photosynthesis is because as the light (energy) falls on the chloroplasts in the leaf, the chlorophyll traps the light, which will then make the energy from the light available for chemical reactions to take place in the plant. ...read more.

Middle

In this experiment I will carry out, I hope to close the blinds in the room and not have the lights on, so the exterior light is not affecting my results. Though the preliminary experiment will, however, show me whether light intensity has any effect or not at all. In this case it has had an effect, and this preliminary experiment supports my hypothesis that as the light intensity increases, as the lamp gets closer to the plant, the rate of photosynthesis, shown by the amount of bubbles produced, increases as well. The experiment also shows that in order to obtain more readings, I should have a shorter time interval for each measurement of oxygen bubbles. Analysis I drew my graph with a line of best-fit curve. I did this instead of a straight line because of the clear pattern of the points on the graph. My graph shows me that an increase in light intensity will certainly increase the rate of photosynthesis. Both my graphs and my results support my hypothesis fully. The prediction I made that, as the light intensity increases so will the rate of photosynthesis, was backed up with the results I obtained in this experiment. This is because photosynthesis will only occur in the presence of light. ...read more.

Conclusion

If I were to carry out the experiment again over a longer period of time, in order to obtain more readings, it would then be necessary to add sodium hydrogen carbonate to the water so the carbon dioxide concentration would be increased. In my result tables, one table had a higher rate of oxygen bubbles produced than the other, and this is due to the fact I used different pondweed the second time, so carbon dioxide levels would not have been the same. Due to the small volumes of oxygen produced, my experiment was perhaps not as accurate as it could have been though I still think it was accurate enough to justify and support my hypothesis. I could improve the experiment by simply increasing the time taken, so fewer errors are able to occur. I could not make this adjustment due to time constraints. To extend my investigation into rate of photosynthesis further, I could try investigating other limiting factors individually, as well as perhaps trying to link in some of the other limiting factors with my current experiment. Further investigation into the light factor could be exploring the effect on the rate of photosynthesis by different coloured lights, which could also lead to whether any other types of lights, like fluorescent lights, would also have a different effect on the rate. ...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. An experiment to determine the effect of light intensity on photosynthesis.

    The light provides the energy needed to excite the electrons and begin the electron transfer chain in the light dependant stage of photosynthesis. Evaluation The experiment was not carried out according to my plan. Due to inaccuracies involved in controlling the variables in the lab, and counting the bubbles of

  2. How light intensity affects Photosynthesis.

    I would use the others but they are too much time consuming, although reliable and probably effective. When I change the light intensity I will measure the rate of photosynthesis I will do five different experiments at different light intensities and each experiment will be repeated three times each, therefore

  1. How temperature affects the rate of photosynthesis.

    The rate at which oxygen is evolved in a fixed amount of time can be used to measure the rate of photosynthesis in the experiment under varying temperatures. Light intensity will also have an affect on how fast the products of light dependant stage are formed.

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

    0 0.4 0.1 0.07 0.1 0.13 0.08 0.1 0.1 0.1 0.4 0.13 0.27 0.4 0.18 15 10.59 3.72 8.2 4.32 1.61 2.71 3.12 13.04 1.91 5.5 2.01 2.14 8.54 5.19 25 14.07 10.35 20.8 11.16 27.48 8.9 18.8 29.91 2.42 25.47 18.23 23.46 20.65 17.78 34 20.44 32.97 44.7 33.28

  1. Free essay

    Solar Desalination Plant

    It is located above the solar absorber and acts as a "roof" to the tank. Due to acrylic's flexible property, it could be easily manufactured into any shape, which is the reason for the use of this material. It also has a high breakage resistance of sustaining impact 6 to 17 times greater than ordinary glass.

  2. INVESTIGATING HOW TEMPERATURE AFFECTS THE

    If there is no markalready present, you can add a small mark at the very top of the cuvette, where it does not interfere with the passage of light through the test solution. Stopclock A stopwatch will also be required to measure the time for each experiment, so that I

  1. The aim of my investigation was to determine how limiting factors would affect the ...

    The main food producing part of the leaf is the palisade layer. The raw materials for photosynthesis must be delivered to the cells in the palisade parenchyma as swiftly as possible. Carbon dioxide gets into the leaf through the stomata.

  2. intensity of light would affect the rate of photosynthesis in a plant

    carbon dioxide used up by the plant will not be sufficient enough to cause the carbon dioxide concentration to become the limiting factor. If my experiment were to be performed over a longer period of time, for instance 24 hours, I would add a fixed amount of Sodium hydrogen carbonate

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