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

Does Light Intensity Affect the Rate of Photosynthesis?

Extracts from this document...


Does Light Intensity Affect the Rate of Photosynthesis? Background Knowledge From a previous experiment I have performed I know that if you increase the light intensity on a plant the rate of photosynthesis will increase with it. I also know that light intensity is a limiting factor that affects the rate of photosynthesis. This means that if you increase the amount of carbon dioxide that it receives and also the amount of water the rate will not increase any more until you increase the light intensity. Other limiting factors are temperature and amount of water. When a plant is taken away from light the rate of photosynthesis rapidly decrease. This is because light is a main factor in photosynthesis. It is so important that if the plant is without light for to long it will die. The formula for photosynthesis is: Carbon Dioxide + Water + Sunlight = Oxygen + Glucose + Energy. The balanced symbol equation for this is: 6CO2 + 6H2O + Sunlight = C6H12O6 + 6O2 Prediction I predict that when you increase the light intensity on the plant the rate of photosynthesis will increase. When the level of gas produced levels out then the maximum light intensity has been reached. This means that it will need more carbon dioxide, water or a temperature nearer the optimum for the plant. ...read more.


This is the point of the experiment so these values are unknown Plan We will be using a computer simulator to perform this experiment. We will enter what we require (the temperature, the amount of sodium hydrogen carbonate) and adjust the light intensity. We must keep the temperature and the concentration of the sodium hydrogen carbonate the same so that the experiment remains fair. If we adjust the values of these then it will affect our readings and our test will not be a fair one. The program we are using has the ability to generate anomalous results. This means that there is as much chance of there being an error in these results as there is in performing the experiment in real life. Change the light intensity for each value chosen and repeat each value 3 times. The values selected are 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100. Therefore there will be 30 results by the end of the experiment. We have the ability to use 10 different values for light intensity as it takes far less time to record each result as you are able to speed up the simulation of the experiment, thus get more results in the time allowed. Diagram Results Light Intensity Length (mm) ...read more.


We could keep the temperature and sodium bicarbonate levels constant and change the light intensity to exact values. The computer made it easy to read off values as it had a ruler with a 'bubble' to help you read off exact values. This is clearly shown in my diagram. The computer programme is also very good and fair as it generates anomalous results. This means the results obtained will not be perfect and therefore there is still some work for us to do. As the computer was able to generate accurate and anomalous results for different light intensities I feel that the method that i chose for this was the best possible. As anomalous results are created and because the experiment takes less time to perform we could have taken more results to make our experiment even more accurate as we would have more values to compare and find averages. The evidence I have collected I feel was ideal as it enabled us to find any anomalies that there were and I was able to make comparisons with my prediction. My prediction is supported by the data I obtained which sows that my experiment was a success. To make the test even more accurate we could perform the experiment practically using all of the same values as used by the computer and compare the results with the computer generated ones and see what differenced that there may be. ...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

    Factors That Affect the Rate of Photosynthesis

    3 star(s)

    Apparatus: Beaker: to hold water and NaHCO? solution, pondweed, funnel and test-tube. Pondweed: to measure the rate of photosynthesis. Funnel: to hold pondweed in place. Test-tube: where oxygen will be collected. NaHCO?: to help saturate water with CO2 Stopwatch: timing the rate of photosynthesis.

  2. How does light intensity affect the rate of photosynthesis

    does light intensity 29/4/01 affect the rate of photosynthesis with the beaker and connect it to the mains supply and switch it on while the chemicals are dissolving in the water so the plant will begin to photosynthesise. While this is happening I will put a filter funnel over the

  1. How temperature affects the rate of photosynthesis.

    using water baths for higher temperatures. A big enough water bath can be used to carry out the initial experiment and the repeats in the same bath unlike using a kettle which would require reheating the water again and again if more water is needed for the same temperature.

  2. Find out how the amount of light, that is light intensity, affects the rate ...

    I will check if heat is affecting the rate of photosynthesis because it could affect the temperature of the water and warm up the Elodea. I will measure the distance from the lamp and Elodea accurately, each minute the distance will be altered and 3 trys will be experimented on, to document my results reliably.

  1. The aim of our investigation is to find out how the amount of light, ...

    not simple instead of the method of counting the number of bubbles given off. . I can make sure that my measuring is accurate by using my preliminary work and using the inverse square law by calculating what my results should exactly be, making a prediction of my results for both the preliminary practical work done and my experiment.

  2. Investigate the factors, which affect photosynthesis.

    This is show that the ethanol is not directly heated. * Chemical resistant gloves should be worn- so no damage is caused to the hands. * Tweezers should be used, to pick up hot objects. Secondary resources During this coursework, I had getting some information from some certain books, the Internet and the library.

  1. whether or not the intensity of light would affect the rate of photosynthesis

    Preliminary work Initially, to ascertain a suitable range of distances at which to record results for my experiment, I did a preliminary investigation in which I recorded the number of bubbles of oxygen given off in a given time at various light intensities.

  2. Factors That Affect Photosynthesis.

    Otherwise, the rate of photosynthesis can no longer increase. Prediction: I predict that increasing the light intensity will increase the rate of photosynthesis at a proportional rate where LI is inversely proportional to 1/d2 when LI= light intensity and d= distance (from light source to plant). This is true to a certain point until another factor is limiting the rate of photosynthesis.

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