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

Investigate one factor which will affect the rate of photosynthesis

Extracts from this document...

Introduction

Investigate one factor which will affect the rate of photosynthesis Introduction Photosynthesis is the process by which plants make their own food. For photosynthesis to occur the plants need sunlight energy, the energy is absorbed by a green pigment called chlorophyll which is found in the leaves of the plant. This energy then combines with water molecules from the soil, and carbon dioxide from the air. After this, a type of sugar called glucose is produced which can be used for the plants energy and oxygen is made as a byproduct. The equation for photosynthesis is: 6CO2 + 6H2O -> C6 H12 O6 + 6O2. Any acceleration in the process of photosynthesis will naturally result in the production of more organic compounds and consequently more plant growth. There are certain things that affect photosynthesis called limiting factors. These are: light intensity, temperature, amount of carbon dioxide available and the amount of water available. Light intensity speeds up photosynthesis because sunlight is needed for the chemical reaction to happen and if the concentration of light is greater, more of it can be used to make glucose and oxygen. The reason is similar for how carbon dioxide and heat affect photosynthesis. Heat speeds up photosynthesis because the enzymatic reactions require the enzymes to be at a warm temperature to work at their best, although not above 40 oc as this is when they are destroyed by the heat. ...read more.

Middle

affects the rate of photosynthesis and so I need to make sure it is the light and not the temperature affecting my results. I will make sure of this by referring to my temperatures if they differ at the end to make sure they are not affecting my results. The amount of CO2 will also be kept the same as it also affects the rate of reaction and the volume of water the pondweed is kept in will also be kept the same. I am going to change the intensity of light by moving the lamp away from the pondweed and taking readings at different distances. The further the lamp is away from the pondweed the lower the density of light available to the pondweed. It is likely that anomalies will occur in my experiment. However, the micro burette will help me avoid anomalies because it gives accurate readings. It will be clear when a result is an anomaly because it will not fit in with the pattern I hope to see. In this situation I will make a note of the anomaly but then delete it and repeat the experiment until the anomaly is overwritten. Safety is an important factor in this experiment as the electricity from the lamp could potentially be dangerous being so close to the water. ...read more.

Conclusion

My evidence does support my conclusion because the amount of oxygen produced was greater (and therefore the rate of photosynthesis was greater) when the lamp was closer (and therefore the concentration of light was higher). This can be seen in the graph with the strong negative correlation and the strong pattern in my table of results. Improvements Although I think my experiment went well there is always room for improvement and if I did the experiment again I would avoid any anomalies by repeating the experiment more times to give a wider range of results and therefore a more accurate set of results. I could exclude all other natural light by possibly completing the experiment in a dark room to avoid fluctuations in natural light and stopping the plant having access to natural light. Plants prefer different wavelengths of light and this may have affected my results, I could expand the experiment by testing the affects different wavelengths on the plant. To do this I could see the affects of different coloured lamps- which would produce different wavelengths of light- on the rate of photosynthesis. To avoid human errors I could use electronic technology e.g. an probe placed in the water linked to a computer to record not only the amount of oxygen produced but also the other limiting factors like temperature, amount of carbon dioxide and the amount of natural and artificial light available to the plant. ?? ?? ?? ?? Rachel Wilkins 1 of 7 pages ...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)

    -Other light sources: For our experiment to be accurate and fair, we must not have other kind of light sources in the area we are working in. If there are, it may also help with the rate of photosynthesis by giving the plant more light so it will photosynthesize more.

  2. Confirm which factors increases or decreases the rate of photosynthesis.

    for plants living in the open, and carbon dioxide is the factor that is limiting of photosynthesis. But in a cool day, morning or evening, light or temperature may become limiting factor as they do not get much light when it is winter.

  1. Three separate experiments which are to be carried out to investigate a plant's unique ...

    For example, if with 100 stomata, 1cm3 of water is given off in 100 minutes, then with 50 stomata, only 0.5cm3 of water will be given off. Likewise, with 100 stomata, 2cm3 of water will be given off in 200 minutes.

  2. Investigate the factors, which affect photosynthesis.

    is removed, once this has taken place the leaf will become like a paste, therefore the experiment will be approximately impossible to be carried out. * All the factors that are being experimented during this coursework should be kept the same to achieve fair and accurate experimental results.

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

    all other abiotic factors remain the same in both areas, throughout the experiment. However this may not be the case as we cannot control them, but any differences will be taken into account. To minimise the effect of each variable, the investigation will take place on the same day.

  2. The effects of organic effluent from the seweage on the biodiversty in a freshwater ...

    The Raised pond was the least turbid whereas Ashby was the most turbid. The day we carried out our test it was raining heavily. Clarity and turbidity relate directly to rainfall and runoff. A hard, fast rain-washes a great deal of soil into the water.

  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. What factors affect the rate of photosynthesis?

    As the temperature is increased the atoms of the reactants in photosynthesis gain kinetic energy and so collide more, producing more chance for atoms to join and react together and therefore decrease the time. However, in photosynthesis, chlorophyll has an optimum temperature between 40 and 45�C and above that it will denature and photosynthesis will not be able occur.

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