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

The affect of Light on Photosynthesis.

Extracts from this document...

Introduction

Photosynthesis Investigation The affect of Light on Photosynthesis Diagram Equation for photosynthesis :- Sunlight + Chlorophyll Carbon Dioxide + Water Glucose + Oxygen 6CO2 + 6H2O C6H12O6 + 6O2 Plan I am going to investigate the affect of light on photosynthesis. To do this I will carry out the same experiment as I did in my preliminary. I shall set up my apparatus, as shown in the diagram, and measure between the 250 watt lamp and the beaker. I will put marks at 20cm, 40cm, 60cm, 80cm and 100cm from the lamp. When the beaker and contained apparatus are at each point, I will time for 2 minutes and record the number of oxygen bubbles released from the Elodea stem. To see exactly how much oxygen is produced at each point, I will collect the oxygen in a cylindrical measuring tube or similar. I shall start by recording bubbles and collecting oxygen at the 20cm mark. This should get the elodea to start photosynthesising straight away, as opposed to starting at 100cm and waiting a long time for it to just start photosynthesising. ...read more.

Middle

There are a few variables in this experiment. They include water temperature, carbon dioxide in the water, distance the apparatus is from the lamp, and the piece of elodea. I must constantly check the temperature of the water in the boiling tube, as it is an important variable and must be kept the same throughout the experiment. This is why I am going to use a thermometer. If the water temperature in the boiling tube drops or rises significantly, the test will be unfair. This is why I am going fill the beaker with water, as it acts like an insulator. I found this out in my preliminary experiment. The water in the boiling tube does not suffer from great heat loss, or gain, because the insulating water around it, in the beaker, prevents this. This way I can control the water temperature and keep this variable the same. When I do the experiment, I will do it all in one go, and so I shall be using the same piece of elodea plant and water throughout the experiment. ...read more.

Conclusion

This describes the rise of the line in my predicted graph. The reason I have levelled the line out, is because the elodea will eventually stop photosynthesising at faster rates, even though the light intensity may be increasing. This is because the CO2 and water temperature are staying the same. (the CO2 level will probably decrease a tiny fraction throughout the experiment) If I increase the light intensity to such a great point the elodea stops photosynthesising, it means I will need to increase the temperature and CO2 level. This is because the CO2 and temperature are limiting factors in my experiment. As I must keep them the same, the elodea will stop photosynthesising more rapidly and stay at the same rate. In order to help me make a prediction, I read pages 12, 13 and 14 of the CGP revision booklet for biology. I also used a science prompt sheet, provided to me by my biology teacher, to help me structure my plan. Included with my plan on separate sheets, is my preliminary experiment method, results and observations. Tom Sharp, Biology, 11-4 ...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. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    This meant the Elodea had a higher rate of photosynthesis and therefore more oxygen was produced. Ideally there would be more time in which to carry out the experiment so the water could be left to even out to the desired temperature.

  2. How temperature affects the rate of photosynthesis.

    * Errors in setting up the apparatus: Not making the cut end of the elodea and the rubber tubing connecting it to the potometer completely air tight could have allowed air bubbles to pass through and to be measured as a part of the length of oxygen bubble released.

  1. Investigation To Find The Effect Of Temperature On The Rate Of Photosynthesis Of Elodea.

    The following diagram represents the absorption spectrum of pure chlorophylls in solution: An action spectrum, on the other hand, describes the efficiency of a particular molecule at acheiving its purpose in absorbing light; this measurement shows what wavelengths of light the molecule can trap to conduct photosynthesis.

  2. Investigate the factors, which affect photosynthesis.

    During the night, most of the starch will be removed from the leaves. If better results are needed, then the leaves are wrapped in aluminium foil for 2 days while they are still on the plant. Then one of the leaves is tested to see that no starch is present.

  1. Photosynthesis - revision notes

    (4) After about 10 days the candle burns again. Conclusions from experiment: This experiment shows that oxygen is produced from photosynthesis. The candle, when put into the sealed chamber, quickly used up the oxygen. When the mint was added it obviously produced oxygen so that the candle could burn again.

  2. Factors That Affect Photosynthesis.

    From both graphs there is a best-fit curved line. This means that the rate of photosynthesis increases at an exponential rate. However, my prediction that light intensity is inversely proportional to the distance squared did not fit into my results perfectly.

  1. Consumer Marketing Plan.

    The Centers for Disease Control & Prevention (CDC) has never confirmed an outbreak in the US of illness or disease linked to bottled water. More recently tap water in Canada was the cause of Crytosporidium outbreak in North Battleford, Saskatchewan which has caused 46 confirmed cases.

  2. Absorption Spectrum of Chlorophyll.

    Chlorophyll a and chlorophyll b each have three isomers with magnesium bonded to three different pairs of pyrrole nitrogen atoms. These isomers exist as tautomers rather than as resonant hybrids (Goodwin, 1965). Also, the original chlorophyll sample may undergo oxidation and produce oxidized products.

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