• 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

    counter will be used to count the number of bubbles being released from the plant. 3. The amount of time the bubbles would be counted for was 2 minutes at first, but because there are so many bubbles being produced, the time will be reduced to 1 minute so the results are likely to be more accurate.

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

    1 2 3 ave Volume of oxygen bubble (mm3min-1) 5 1 2 2 2 3.14 10 7 9 7 8 12.6 15 19 14 12 13 23.6 20 18 19 19 19 29.8 25 26 25 27 26 40.8 30 24 45 43 44 69.1 35 38 37 40 38 59.7 40 28 30 30 29 45.6 45 8

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

    This caused anomalous results. E7.b Validity of conclusions Due to the temperature fluctuations and the unsteady flow rate of the carbon dioxide some of the results obtained were distorted and therefore invalid. Also, the possible loss of carbon dioxide gas made some of the results obtained inaccurate.

  2. Mangrove Soil Analysis

    Sand = Sand depth Total depth 41.46 % 29.73 % 9.80 % Minimal 84.85 % 22.22 % % Silt = Silt depth Total depth 31.71 % 24.32 % 56.86 % � 76.32 % 12.12 % 24.07 % % Clay = Clay depth Total depth 26.83 % 45.95 % 33.34 %

  1. How temperature affects the rate of photosynthesis.

    Now let the elodea photosynthesise for 5minutes and measure the time accurately using a stop clock. 14. After 5 minutes slowly draw the oxygen bubbles into the potometer by pulling the syringe out. Keep drawing water until no more bubbles appear.

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

    * This water was then poured into a beaker. * This beaker was placed on top of a blue flame Bunsen burner with the air hole fully opened. * A thermometer is used to measure the water inside the beaker.

  1. The investigation is aiming to look at transpiration.

    If this is done a more reliable result can be obtained and also a fair comparism can be made. It also helps to cut the end of the stem with a slanting cut, as air bubbles are less likely to get trapped against it.

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

    This is where the line in graph 2 shallows. The shallowing of the line in graph 1 can be explained by the fact that light intensity is inversely proportional to the distance squared. This means that as distance increases the light intensity decreases at an exponential rate.

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