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

Experiment to show the rate of photosynthesis

Extracts from this document...

Introduction

Experiment to show the rate of photosynthesis Aim: Experiment to show the rate of photosynthesis when pondweed is under different life intensities. Prediction: I predict that the closer the light is to the pondweed the (or the higher the light intensity) the more oxygen will be produced until a certain point where the temperature or carbon dioxide levels will be the limiting factor. The further away the light, the slower the oxygen bubbles will be produced so the less light the less photosynthesis will occur which is needed for the plant to make food. The rate increases (A) but only to a certain extent. Then they don't increase any more because of the other limiting factors of the carbon dioxide levels and temperature. Method: * Lamp * Sodium Hydrogen Carbonate * 1 Meter Ruler * Water * Beaker * Stopwatch * Pondweed * Measuring Cylinder * Scales * Set up apparatus like above with the light source 5 cm from the beaker and cut the end of the pondweed. ...read more.

Middle

2cm away from beaker at all times * Amount of KHCO3 added Why: The CO2 provided can affect the rate of photosynthesis How: One scapula full put in to the water with the pondweed every time * Dark room or same light around the pondweed other than the lamp Why: If more light is focused on the pondweed the rate of photosynthesis will be increased and it will not be a fair test. How: Investigation to take place in dark room Results: Test 1 Distance (cm) Bubbles 5 14 10 9 15 6 20 5 25 3 Test 2 Distance (cm) Bubbles 5 14 10 7 15 7 20 5 25 4 Distance (cm) Avg. Bubbles 5 14 10 8 15 6.5 20 5 25 3.5 Conclusion: The most bubbles were produced when the light intensity was 5cm away from the pondweed which means more oxygen is produced which suggests that the more light focused on the pondweed the more photosynthesis will occur and the photosynthesis occurred very fast on that measurement which also prooves my prediction was correct. ...read more.

Conclusion

The oxygen produced for both tests for the 20cm distance were the same which shows that the results were correct. The 25cm distance was also close and had an average of 3.5 bubbles per minutes which shows that all of my results were pretty much correct and less oxygen is produced when the light source goes further away. There were also no major anomilies but a couple of problems were faced during the investigation. The initianal pondweed used for some of the experiments did not produce any oxygen so the experiment had to be redun. To improvw this I should be using fresh autotrophic pondweed to produce oxygen first time around. Another problem faced was that the distance between the light and the beaker wasn't exactly spot on so to make this a better test the measurements should be taken accuretly and marks should be made where appuratus should be placed. ...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. How temperature affects the rate of photosynthesis.

    decrease with it being the highest at 45 oC and lowest at 65 oC and the decrease will be inversely proportional to the increase in temperature". This was also proven right as the rate of oxygen production did fall between 45 oC and 65 oC for both graphs.

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

    2 pipettes To transfer deionised water and universal indicator into the boiling tubes Deionised Water 100ml 10 ml will be used for each soil sample. It will help to identify the pH of the soil by creating a solution, which will then be tested with universal indicator.

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