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

The aim of my experiment is to determine whether or not the intensity of light would affect the rate of photosynthesis in a plant.

Extracts from this document...


Aim The aim of my experiment is to determine whether or not the intensity of light would affect the rate of photosynthesis in a plant. Introduction Photosynthesis is a biochemical reaction in plants to create glucose using light energy, water and carbon dioxide. Chlorophyll absorbs the light energy. Light energy Water+ carbon dioxide + glucose oxygen 6H20 + 6CO2 C6H12O6 + 6O2 Light energy is needed by plants in order to break down the bonds in water and carbondioxide, and also to create new bonds between atoms in order to form glucose and oxygen. Energy is required for this procedure and this energy is retrieved from light energy. Light energy is absorbed by chlorophyll found in chloroplasts in mesophyll cells (found in green leaves). Chlorophyll is placed in the top cells of a leaf so that it can absorb as much light as possible. The manifestation of chlorophyll is green as it reflects green light and absorbs red and blue light. Magnesium and iron are main factors for the manufacture of chlorophyll. When the light energy is absorbed by chloroplasts it is trapped and is then made available for chemical reactions in the plant, so more photosynthesis takes place in specific a given time. ...read more.


I also made sure I only changed one thing, which was the light intensity towards the plant. * I made sure that the amount of water surrounding the plant was kept equal throughout the entire investigation. Above I have shown the precautions taken in order to assure that my investigation was as fair as possible. I will now look into further detail about each specific Variable: Independent Variable: light intensity is to be varied by increasing and decreasing the distance from the light source to the plant Dependent Variable: Volume of oxygen produced (rate of photosynthesis) is to be measured by finding the volume of oxygen produced in a minute, and thus finding the rate of photosynthesis Control Variable: Light wavelength (colour) light energy is absorbed by the pigment, chlorophyll, in the leaf. Chlorophyll easily absorbs blue light, in the 400-450 nm range, and also easily absorbs red light, in the 650-700 nm range. However it does not easily absorb green or yellow light, rather it reflects them, decreasing the amount of light absorbed, and therefore the rate of photosynthesis. This can easily be controlled, simply by using the same lamp throughout the experiment. ...read more.


It would be square to stop refraction of light. This experiment not entirely fair because we could not see all the bubbles produced due to some of them being too small and some too quick, also some may have stuck underneath the plant. To trounce this I would use a gas syringe as this avoids human errors such as blinking and also allows for more accurate measurements, we would also leave the plant for longer this will allow for a fairer result. Looking at the three sets of results I would say they are fairly reliable but they is still little doubt that they're similar but could be more analogous. To surmount this I would repeat the experiment more times to have more comprisable results. Extension To extend this experiment I would use different coloured lights to see if it affected the rate of photosynthesis. I think due to the fact that chlorophyll is green it when green light is shone on a plant very little photosynthesis if any will take place, also I think that white light will give the best results. To do this experiment I will repeat as I did in the last but instead of changing the distance I will use light filters to change the colour of the light Rajiv Patel Leytonstone School 8152 - 1 - ...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. Photosynthesis. The aim of my experiment was to determine whether or not the intensity ...

    I am therefore going to perform the experiment at room temperature, checking the temperature frequently, in case the heat given off from the light should slightly raise the temperature, in which case I shall simply refill the beaker with more water after each experiment.

  2. How does light intensity affect the rate of photosynthesis

    I will then put the piece of Pondweed in the beaker, with the slit end pointing up underneath the filter funnel so that I can collect all the gas given off by the plant. I will then use a spatula to measure out two spatulas of Sodium Hydrogen Carbonate and

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

    The shape of the graph shows this as steepness of the best-fit curve increases till around 25oC. This is the same pattern for graph 1, as after 25 degrees the curve of best fit increases steadily. After around 25 degrees the line increases steadily till around 32 degrees on graph

  2. How temperature affects the rate of photosynthesis.

    This is because if more time is allowed for photosynthesis to take place, a larger air bubble will be produced. If a smaller amount of time is allowed, then a smaller air bubble will be produced. Again the rate of photosynthesis will be affected by the amount of time given for the reaction to occur and not only temperature.

  1. How does light intensity affect photosynthesis?

    So if the lamp is started off at 100cm away from the plant, the plant will not be able to store light as intense as it will get at the next step of the experiment.

  2. An experiment to determine the effect of light intensity on photosynthesis.

    Finally, photosynthesis is dependant on chlorophyll, a green pigment within the chloroplasts of plants, found in large quantities in the palisade layer of the leaf. The overall ability of a plant to photosynthesise is dependent on the rate at which carbon dioxide and water can be combined within the chloroplasts.

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

    This lack of accuracy was mainly due to the fact that by simply counting the bubbles, I was relying on each bubble being exactly the same size, which they clearly were not. The preliminary experiment will, however, give me a best fit curve to which I can compare my main

  2. An Investigation into Species Diversity with distance along a Pingo.

    it is particularly sunny all plants will have exposure to the same light intensity. * The equipment used both in the common and in the lab will be the same for each recording for example the same light metre will be used for all of the light readings in the

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