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

Photosynthesis produces energy in the form of glucose it uses water from the soil, carbon dioxide from the air, and energy from the suns light.

Extracts from this document...

Introduction

Julius Atuona Modular Science Photosynthesis Coursework Photosynthesis produces energy in the form of glucose it uses water from the soil, carbon dioxide from the air, and energy from the suns light. Photosynthesis takes place in all plants that contain chlorophyll. Photosynthesis mainly takes place in the palisade mesophyll cell in the leaves of plants. The main reaction is to produce oxygen and glucose, glucose is stored in the form of starch and does not affect osmosis, taking place in the plant. As plants respire both night and day this starch is often used up during the night when photosynthesis cannot take place. The uses of glucose within the plant are for active transpiration, cell division, the production of protein and the production of cellulose. In photosynthesis the raw materials are carbon dioxide and water. They react to form the same products of the reaction of oxygen and starch (glucose that has been stored). The reactions need energy and this comes from light. The green chloroplasts allow light to be used as energy and therefore both of these things are like helpers in the reaction. ...read more.

Middle

We will use Canadian pondweed. By counting these bubbles we can tell how fast oxygen is being given off from the photosynthesis. We will place the Elodea in a beaker along with warm water and a bit of Sodium Hydrogen Carbonate (NaHCO3). If it wasn't there then another limiting factor may be the cause of the rate changing instead of just light. By placing the beaker next to a lamp we can change the light intensity. The weed will be given a set number of minutes each time to adjust to the new level of light intensity. The rate of reaction will be in number of bubbles per minute (b.p.m). Constant and Variable factors The factor that will be changed is light intensity. The factors that will be kept constant are the amount of water the weed is put in, carbon dioxide levels, lamp that is used and temperature. I think that as the light intensity is increased the rate of photosynthesis will also increase. ...read more.

Conclusion

It does prove however that as light intensity is increased the rate of photosynthesis is increased also. This is because the more light there is available the more light the chloroplasts can absorb. They use this light in the reaction as energy; therefore the more energy there is available the faster the reaction can take place. Evaluation On the graph there wasn't a point where the rate started to level off. Many things can explain these results, among others. We did not attempt to adjust the temperature as well as we could have done which is a limiting factor of photosynthesis. Also the size of the pieces of Elodea were not all the same so some people may have achieved different results depending on the size of their Elodea and therefore how much surface area was available for photosynthesis to take place in the palisade mesophyll cells. As the burette fills with the gas, water is displaced and the level drops. I think that overall our evidence is very reliable and that our results show what I thought they would. ...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 Carbon Dioxide on the Rate of Photosynthesis

    With 0.2g being the concentration, more results could be obtained and the results would be more accurate as not as many bubbles would be being produced rapidly. 2. Also, when counting the bubbles it was seen that a lot of human error was involved so to reduce this, a tally

  2. Mangrove Soil Analysis

    23.68 % 3.03 % 53.70 % Discussion: There are many different kinds of soil and they all have there own individual characteristics that affect the flora growth in that type of soil. These characteristics are things like: * The capacity of soil to hold minerals and water * The movement (capillary action)

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

    This would not have been such a big problem had the light intensity stayed constant. However people were switching their lamps on and off meaning the light intensity varied slightly throughout this experiment. It is too difficult to know how much of an effect this had.

  2. The rate at which Alka-Seltzer tablets react with water.

    Results Average temperature of water in beaker in oC (1dp) Average time taken for Alka-Seltzer tablet to dissolve in seconds (1dp) 1/time taken for Alka-Seltzer tablets to dissolve in seconds (3dp) 25 35.3 0.028 31 26.7 0.038 40 21.0 0.048 49 16.8 0.060 60 15.3 0.066 70 13.7 0.073 From

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

    of the quantity of light on Elodea, one must keep both the amount of CO2 and the temperature constant. Light intensity will decrease as the distance between the light source and the object increases, and vice versa. Thus the relationship between LI and distance can be described as 1 This

  2. How temperature affects the rate of photosynthesis.

    Increase in temperature can also cause the molecules in the light stage to gain an increase in kinetic energy and to react faster. An indirect affect on temperature in increasing or decreasing the rate of photosynthesis is its affect on enzyme activity.

  1. Experiment to investigate the effect of different concentrations of Carbon Dioxide on the rate ...

    Then a light will be shone on the measuring cylinder from a set distance and the amount of bubbles being produced in the measuring cylinder for a set period of time will be recorded. Two readings of bubble production will be taken.

  2. Effects of temperature and carbon dioxide on photosynthetic rate in Elodea.

    The fall occurs at temperatures too low for it to be entirely accounted for the denaturation of enzymes. The effect of carbon dioxide on the rate of photosynthesis. In the light-limiting region the rate of photosynthesis is not affected by lowering the CO2 concentration.

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