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

Photosynthesis GCSE Coursework

Extracts from this document...

Introduction

Photosynthesis GCSE Coursework Aim: To investigate how much light intensity affects the rate of reaction. Reaction: photosynthesis of Canadian pondweed (Elodea) Introduction- what is photosynthesis? The definition of photosynthesis is when plants process water and carbon dioxide to produce glucose by the process of photosynthesis. Photosynthesis is the method that plants use to make their own food. When photosynthesis takes place, plants use the suns energy to combine carbon dioxide from the air with water from the soil to create glucose (a carbohydrate). Carbon dioxide+ water (+light energy)> glucose + oxygen (Simple raw materials) (Carbohydrates food) (By-product) Mostly photosynthesis takes place in leaves, as leaves are photosynthetic organs they make food. Chloroplasts in the leaf cells has got green pigment chlorophyll, it absorbs light energy, making it available for photosynthesis. Plants use glucose to provide energy and raw materials. Glucose can be built into starch, which is a food store, or into cellulose for cell walls. ...read more.

Middle

Fair test- to ensure that a fair test is carried out the following things must be done. The same pondweed must be used every time we change the light distance. Do the experiment three times for each distance to get an accurate average. There must only be one variable and that is the distance of the light source from the plant. Choose a value for carbon dioxide mixture and keep at the same value all the way through the experiment. Take results after three minutes for each individual experiment. Safety- Follow lab safety rules (e.g. no running bags at the back etc.) Keep the desk lamp away from contact with water Be careful when using scapular. Method- 6 step-by-step instruction guide of how I'm going to carry out my investigation. 1. Place down meter ruler 2. Get lamp and heat shield 3. Get clamp and hold glass heat shield in place 4. ...read more.

Conclusion

Prediction: I predicted that as the intensity of light would increase and also the rate of photosynthesis would increase. My hypothesised is that if the light intensity increase and the rate of photosynthesis will increase at a proportional rate until am certain level is reached, and the rate of increase will then go down. The level will eventually will be reached where an increase in light intensity will have no further effect on the rate of photosynthesis, as there will be another limiting factor, in this case probably temperature. Results- Temperature: __c Light intensity Gas produced (mm) Distance from the lamp (cm) Reading1 Reading 2 Reading 3 Average 5 8.0 7.5 7.8 7.76 10 6.0 6.2 6.4 6.2 15 4.2 5.1 5.0 4.7 20 3.0 3.2 3.3 3.16 25 2.1 2.5 2.2 2.26 30 1.0 0.7 0.8 0.83 Conclusion: from my results and graph I can conclude that the further the lamp is from the elodea the less gas is produced. The first 10cm it drops from 8 to 6mm, that's 2mm decrease, the pattern is the line going more downer by the mm when the cm is rising. ...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. Photosynthesis coursework

    be a problem Water availability - water is also required in the photosynthesis reaction, and when it is lacking, the plants´ stomata close to prevent further water loss. This closing of the stomata cells also leads to little carbon dioxide being able to diffuse through.

  2. An Investigation into Species Diversity with distance along a Pingo.

    By this time water from the soil could have evaporated which would have reduced the moisture content of the soil and so caused inaccuracy in the data obtained as the soil may have, in reality, had more water. The soil samples were also only placed in the oven once.

  1. How temperature affects the rate of photosynthesis.

    controlling the process of photosynthesis will denature and cease from catalysing the while reaction. Therefore the length of the oxygen bubble at 65 oC would be the smallest. It can also be said that the two graphs which would be plotted, would be symmetrical in shape forming peaks between 35-45 oC.

  2. Free essay

    Biology Coursework

    Before this process happens plants need certain criteria for them to produce starch. The most important criteria are light energy from the sun. Chlorophyll is a green photosynthetic pigment found in plants.The chlorophyll absorbs the light energy from the sunlight combining with carbon dioxide and water to produce glucose.The glucose

  1. Science Coursework

    There are far too many anomalies making my experiment inaccurate. I think that one of the reasons the anomalies occurred was because of me only timing it for 1 minute at each distance, meaning that the Elodea did not have time to properly start producing oxygen at a steady rate.

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

    gain more kinetic energy with the increase in temperature. As the temperature goes beyond the optimum temperature of the enzyme, the rate of reaction decreases. This is because the kinetic energy is too great and some of the bonds within the enzyme start to break. As the temperature is further increased more of the internal bonds are broken.

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