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

An investigation to find out how the amount of carbon dioxide affects photosynthesis in pondweed

Extracts from this document...

Introduction

An investigation to find out how the amount of carbon dioxide affects photosynthesis in pondweed Strand P - Planning your investigation Photosynthesis is a food-making process that occurs in green plants. It is the main function of leaves. Green plants use energy from light to combine carbon dioxide and water to make food (glucose). Prediction: I predict that the more carbon dioxide there is in the water the faster the photosynthesis will take place. I predict this because for a plant to possibly photosynthesise it needs both light and carbon dioxide. The photosynthesis formulae is carbon dioxide + sunlight = glucose. The plant food product of photosynthesis is glucose. Apparatus: Pond weed, Pond water Sodium Bicarbonate, Test tube, Stopwatch, Spatula. Variable change: In my experiment I will change the amount of sodium bicarbonate that I put into the water. ...read more.

Middle

I will use no sodium bicarbonate for the first trial and go up by 1 teaspoonful of sodium bicarbonate each time until I reach 8. The sodium bicarbonate will add carbon dioxide to the water. Each trial will last 5 minutes. See prediction for more detailed science. Strand O - Obtaining evidence I collected my apparatus and carried out my investigation safely, I took my readings. No. teaspoons of SB Trial run 1st test 2nd test 0 2 2 1 1 5 6 0 2 9 8 4 3 17 9 17 4 18 21 38 5 19 24 49 6 23 22 55 7 30 25 61 8 39 31 73 SB = Sodium Bicarbonate Strand A - Analysing the evidence Trial run: My trial run ran perfectly well, it came out just as I expected it to. ...read more.

Conclusion

I think it might be because I carried out the two tests on different days with different pond weed. I think it is more the pond weed that had more of an affect on the test rather than room temp etc. Both my experiments were similar because they both photosynthesised better when I added more carbon dioxide to the water and they were different to each other because they photosynthesised at very different speed. Strand E - Evaluation There was no really surprising data which I collected apart from 1 reading which showed that the plant had decreased in photosynthesising. I could have been more careful with counting the amount of oxygen bubbles. The apparatus I used were just right for my experiment, I had no problems with them. If I was to do this experiment again I would use the same pond weed and take all of my readings in one day to make it a completely fair test. I had no major problems with the investigation. ...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 Investigation

    not have starch present in it because there was absence of chlorophyll Diagram for the experiment Testing for Carbon Dioxide Aim In this experiment my aim is to see whether carbon dioxide is actually necessary for photosynthesis to occur.

  2. How temperature affects the rate of photosynthesis.

    But again the rate of decrease between 45 oC to 55 oC and 55 oC to 65 oC is not constant and therefore again the part of the prediction that stated that the decrease between 45 oC to 65 oC would be inversely proportional to the increase in temperature is proved wrong to an extent.

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

    Chalk grasslands are a rendzina soil. They are therefore very thin and the bedrock is not far below the top layer of soil. The bedrock is chalk, which is very porous and well drained. The water-holding capacity is largely dependent on the thickness of the soil layer because only the soil can maintain water.

  2. Yeast Investigation

    Prediction I have chosen to change the temperature of the water in the suspension. I know that an enzyme called zymase controls the yeast respiration reaction. The zymase in the yeast needs certain conditions to make the reaction possible; this reaction is shown in a word equation below.

  1. Investigation To Find Out How Amount of Light Affects Photosynthesis.

    36 30 21 6 Average number of bubbles 75.6 55.6 29.6 31.6 20.6 13.6 Graphs: Analysis of results: In the graph: 'to show how the distance of the light from the test-tube affects the temperature', the best-fit line travels diagonally down and to the right.

  2. Investigation on How the Amount of Light Affects Photosynthesis.

    As I am going to investigate on how the amount of light affects photosynthesis I am going to use a lamp and move it away from a beaker. To do this I am going to use a plant called Elodea (a Canadian pondweed)

  1. An Investigation to find out how Light Intensity affects Photosynthesis in Pondweed.

    Seal the bottom end of the delivery tube. 4. Remove the seal from the top end of the delivery tube. 5. Tip the delivery tube up and release seal to position bubble, and then replace seal. 6. Seal the bottom of the delivery tube to the test tube, and

  2. Photosynthesis Investigation

    I found this extract from the Imperial College website as it shows clearly the complicity of Photosynthesis and the stages that take place. As it says in the extract the light is harnessed by this membrane protein to split the water showing that the more light the more water is split.

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