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

How does changing the temperature affect the rate of Photosynthesis?

Extracts from this document...

Introduction

How does changing the temperature affect the rate of Photosynthesis? Photosynthesis is a necessary process which occurs in green plants, where the plant produces oxygen and makes food, taking place in the chloroplasts that contain chlorophyll. The chlorophyll absorbs the sunlight, and with that sunlight, water and carbon dioxide combine to make sugar and oxygen. The formula for this process is: 6CO2 + 6H2O > C6H1206 + 602 This process, photosynthesis, requires several important elements in order to occur. The factors which must be controlled are: temperature, light intensity, pH, light colour, H20, concentration of CO2 and amount of chlorophyll. When or if one of these factors is increased, the rate of photosynthesis will increase, though only to a certain point - the rate of photosynthesis though, could still increase, but not due to an increase in that same factor. In order for glucose to be made during photosynthesis, water's split into oxygen and hydrogen molecules. This is done by the enerrgy absorbed by the sun, following, the hydrogen must combine with the carbon dioxide to produce glucose. Without the sunlight, eventually the hydrogen would combine with the CO2, though it'd take a far longer time. A catalyst is needed to increase the rate of the process. In this case, the catalyst is enzymes. ...read more.

Middle

I cut roughly 6cm of elodea underwater, cutting the stem diagonally. I anchored a paper clip to the end which had not been cut. The piece of elodea was then placed into the water-filled test tube, ensuring the diagonally cut end was pointing upwards. I used the test tube holders to put the test tube into the water bath and fill the test tube with water from the bath. 3. After checking the temperature in the test tube, I added a quarter of a lab spatula of Sodium Hydrogen Carbonate to the test tube and stirred gently. 4. Immediately after doing so, I timed for 30 seconds on my stopwatch whilst counting the number of bubbles produced from the cut stem of the elodea. I repeated this test a further two times to give me three results for this temperature. 5. I turned the temperature control on the water bath to 40�c in order to prepare for the next temperature test. 6. I repeated these steps for each temperature, lowering the temperature of the water bath to the temperature required. My Preliminary Experiment: My preliminary experiment allowed me to identify faults in my plan and alter them for the real experiment. I needed to work out which temperatures I could count the gas bubbles at, and found that at the temperature of 60�c, none were produced. ...read more.

Conclusion

Cloud cover could have altered the amount of light allowed to the plant, as the day passed. If so, this could not be helped. Conclusion: How does changing the temperature affect the rate of photosynthesis? To answer my original question, as the temperature increases, the rate of photosynthesis increases - more oxygen bubbles are produced. The higher temperatures allow more heat energy to be absorbed by enzymes, and collide with the carbon dioxide and hydrogen which they can only accept, they consequently work more quickly, and collide more frequently. Evaluation: I managed to conduct this experiment with as little help as possible, only allowing another person to help time with the stopwatch. I am happy and confident that my results are of a good quality and reliable. If I were to conduct this experiment again, I should like to repeat my readings more than three times to ensure I have the most reliable results possible, along with a more accurate average. My error bars are of a reasonable span. My technique throughout the experiment was good, though occassionally due to the complexity of this investigation, the elodea was left in the water longer than other times, therefore it could've become more familiar with the temperature, slowing down its reaction. Imogen Kirk 24th February 2010 ...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.

    * 1.5% hydrogen carbonate solution will be used at a volume of 40cm3. This is because 1.5% produced a good amount of gas, again not too much or too little. * The temperature will start at 50C and will be increased in 50C intervals up to 500C.

  2. This experiment involves using a photosynthometer to investigate how temperature affects the rate of ...

    It can be argued that counting the number of bubbles can be deceiving and therefore another method should be put into consideration. An alternative way of doing the same experiment more accurately can be achieved by using a photosynthometer. A freshly cut strand of the plant is suspended upside down in a boiling tube.

  1. How temperature affects the rate of photosynthesis.

    or increasing the number of substrate molecules, or increasing the speed at which the enzyme and substrate molecules move within the reaction site. "As the speed of the molecules increases, they gain more kinetic energy and collide more often. Moreover they do so with more energy, enough to break or make the bonds and to form products."

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

    Also, during high rates of photosynthesis, it would still be difficult and impractical to measure the volume of oxygen produced for a long duration. Due to the nature and convenience of the experiment, it could be easily modified to investigate another variable of photosynthesis.

  1. Absorption Spectrum of Chlorophyll.

    The four absorption spectra that were obtained are shown in Figure 9. Figure 9. Comparison of Spectra from Different Okra Extracts The range of absorbance values at a given wavelength in Figure 9 shows that varying amounts of chlorophyll were extracted from okra by the acetone.

  2. Investigate the factors, which affect photosynthesis.

    * During each the starch test that is taken into consideration, a certain amount of Iodine is to be used. This make the experiment a fair test as it is at a fixed concentration. * The time that each experiment should have taken place in, should be at a constant point in time.

  1. INVESTIGATING HOW TEMPERATURE AFFECTS THE

    For example the type of the beetroot should be the same; if not then this could affect what temperatures the membrane denatures because of the different prior environments of the beetroot. I will make sure that I wipe the test tubes after rinsing them so any excess water is removed.

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

    Insert plunger just inside barrel of device and gently shake mixture for 30 seconds. Press the plunger down slowly until it touches the mixture; place on the cap and screw down slowly until you see the solution filter into plunger.

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