• 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...

Introduction

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.

Middle

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.

Conclusion

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. Marked by a teacher

    Factors That Affect the Rate of Photosynthesis

    3 star(s)

    Chlorophyll is like an enzyme. They trap sunlight. These enzymes work best in warm temperature but not when hot. If the temperature is too hot, the enzyme may be destroyed and no longer able to photosynthesize. � The rate of photosynthesis increases proportional to the light intensity until a certain

  2. 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.

  1. How does light intensity affect the rate of photosynthesis

    under the water so I can collect all the gas given off into the water. I will then take a piece of Canadian Pondweed and use a knife to make a small diagonal slit at the top of the plant so that I can gain the maximum oxygen that it produces.

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

    and as the scale was against graph paper, it is difficult to get an exact reading. The temperature of the water could be inaccurate; where the water was not monitored electronically the temperature could fluctuate. Adding ice and warm water is not an accurate way to keep the temperature constant.

  1. What is the effect on the rate of respiration of yeast cells with glucose ...

    Anomalous results and suggested reasons for anomalous results When looking at the graph drawn, it is evident that these results do not follow in the same trend as the other results. The trend of the graph was that This illustrates that an error had been made, as if the results

  2. Investigate the factors, which affect photosynthesis.

    Method * At first the de-starching experiment is taken into consideration. This is shown above. * After the de-starching experiment is completed, the potted plants are watered and their shoots will be enclosed in two conical flasks. * The conical flasks are held upright with the help of using a clamp stand.

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

    plant or human has an optimum temperature at which they function best. Above this temperature the enzymes within the species become denatured, they are destroyed irreversibly by the high temperatures. In the case of the pond weed if they enzymes within the plant became denatured then it would become unable

  2. Investigating the abiotic factors that affect the size of Ivy leaves in shaded and ...

    square quadrat is a quicker and more appropriate way to collect my sample of ivy leaves. Moreover, the ivy leaves that are going to be used in the sample will all be from within the square quadrat, so they are all likely to be in the same environmental condition as

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