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

Photosynthesis. In practice, TEMPERATURE, CARBONDIOXIDE, and LIGHT INTENSITY can interact to the limit of the rate of photosynthesis

Extracts from this document...

Introduction

Kieron Fenn Biology coursework Photosynthesis. Green plants don't absorb from the soil. They make their own food, using sunlight. This is called photosynthesis, which actually means 'making through light'. It occurs in the cells of green plants, which are exposed, to light. Carbon + Water LIGHT Glucose + Oxygen Dioxide CHLOROPHYLL 6Co2 + H2O C6H12O2 + 6O2 Some of the glucose produced in photosynthesis is used immediately by the plant to provide energy via respiration. However, much of the glucose is converted into insoluble starch for storage in the stem, leaves or roots. In practice, TEMPERATURE, CARBONDIOXIDE, and LIGHT INTENSITY can interact to the limit of the rate of photosynthesis. Anyone of them in particular at a particular time may be the limiting factor. With photosynthesis the more intense the light or the more amount of light the plants get, the more photosynthesising the plant will do. This means that I will be able to predict that my graphs up to a certain extent will be directly proportional. This also means that the light intensity will always limit the light of photosynthesis. There will be a point in the graph where the light will not effect the rate of photosynthesis. Therefore there must be some other limitation effecting the rate of photosynthesis which will either be the dark reaction, the carbon dioxide or the temperature. ...read more.

Middle

Method Fill the boiling tube with water and add 1g to the sodium hydrogen carbonate. Then place the Canadian pond weed using the tweezers. Then place the boiling tube in the water bath and take the temperature. Then place the water bath in front of the light source and wait for the bubbling to star. If there is no bubbling then you must snip a piece off the top of the weed. Place the light source at your chosen distances and count the bubbles for 1 minute each time. The conditions that we had to use were the room had to be dark and the temperature of the solution was 19 degrees Celsius. Diagram Analysis The graphs I have laid out are concave curves, which is what you would have to expect from graphs with direct proportion. The plots show and the lines show the results, on the distance/bubbles graph, you will be able to see that I have plotted an average as well as the previous three attempts. On the second graph you can see that I did no plot and show the previous three attempts because I felt that it was not necessary. The curves on both of the graph show that the rate of photosynthesis never reached zero as I predicted in the hypothesis, this is because the room never was totally dark. ...read more.

Conclusion

Although I think that the reliability of the experiment was not as good as it could be, I think that the experiment was not really that effected, and it wasn't that much of a problem. To make my results reliable and good I decided to do them three times and then take an average to produce the graph and from the graph I would say that my results were suitable and very reliable. My results produced similar graphs to what I had hypothesised in my hypothesis. I feel that the distance graph was inversely proportional like I said in my theory and the intensity graph was directly proportional. I did not get very accurate answers because some of the bubbles were bigger than the others. To make more accurate results I would use a more accurate method as shown below. As you can see the bubbles produced by the plant is automatically drawn up the capillary tube and then they congregated at the corner. After one minute I will pull back the syringe and this will draw one big bubble to the end of the syringe. Then I will be able to measure the bubble with a ruler. After knowing this information and the circumference of the capillary tube you can then work out the surface are therefore giving a more accurate result. By Kieron Fenn. ...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

    Light Intensity and Photosynthesis.

    4 star(s)

    The preliminary experiment will, however, give me a best fit curve to which I can compare my main graph, and also points at either end of my results at which it is clear to see light intensity has little or no effect.

  2. How does light intensity affect the rate of photosynthesis

    There were air bubbles in the delivery tube that would affect the bubble that was made and the apparatus was very awkward to put together and maintain. I decided that I would use an alternative method to collect the oxygen.

  1. Mangrove Soil Analysis

    Place all the agar plates in an incubator at 20�C. Results: Inner Zone Mud sample Middle Zone Mud sample Outer Zone Mud sample Trinity Beach sample Stoney Creek Rainforest sample Clay sample Discussion: It is difficult to see the details in the pictures above but when viewing them naturally

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

    When carbon dioxide concentration is low less GP can be produced. The carbon dioxide in our experiment will come from the H20 from which it is dissolved. We will add sodium bicarbonate to increase the amount of carbon dioxide the elodea is exposed to, therefore will increase the rate of photosynthesis.

  1. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    GP is then reduced to triose phosphate in the presence of ATP and reduced NADP. ATP and reduced NADP are produced in the light dependant reaction. In high temperatures, to keep up with the high demand of ATP and reduced NADP, the light dependant reaction needs to take place quickly, relying on a lot of light.

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

    They are effective in preventing the gas from evaporating from the conical flask. Count down timer To set the 10 minutes within which the carbon dioxide gas is collected and measured. It is very easy to use. It has an alarm to alert the user when the set time has elapsed.

  1. To investigate how light intensity affects the rate of photosynthesis of pond weed at ...

    Evaluation: - My results are mostly accurate because most of my dots are close to or on my line of best fit, which shows that they follow a certain trend hopefully to reinforce my prediction. I have obtained one anomalous result from my investigation which was when the lamp was at a distance of 10cm from the plant.

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

    would be, when the lamp was set at any distance. Similarly, I had no idea at what distance the plant would cease to photosynthesise, as the lamp was the only source of intense light available. The lab in which the experiment took place was not very well supplied with light,

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