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

To investigate the affect of light intensity on oxygen produced by pondweed.

Extracts from this document...

Introduction

To investigate the affect of light intensity on oxygen produced by pondweed. Prediction I predict as the light intensity increases the pondweed will produce more bubbles of oxygen because the pondweed photosynthesises quicker when more light can get to it. For photosynthesis to happen, carbon dioxide needs to get inside the leaves. It does this by diffusion through the very tiny little holes under the leaf called stomata. ...read more.

Middle

5. Place a lamp to one side of the beaker or jam jar. 7.Now put the lamp 50cm away from the beaker then 40cm, 30cm, 20cm and 10cm, wait a few minutes, then count the number of the bubbles again. Do this three times and work out the average for each distance for one whole minute. Diagram The length of the test will be in one minute intervals. Distance (cm) Test One Test Two Test Three Average of pond weed away from lamp (In Bubbles) (In Bubbles) (In Bubbles) ...read more.

Conclusion

as I move the lamp away the number of bubbles goes down At the start of the graph when the lamp was closest the number of bubbles dropped a large amount then the drop got smaller and smaller and levelled off. Evaluation I think the test was in accurate because the size of the bubbles could have changed so it could have produced a bigger or smaller bubble. Th e way to make it a fair test is measuring the volume of the bubbles. Jason kench 10F2 Mrs Roberts ...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
  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work