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

Investigating the effect of light intensity on the rate of photosynthesis.

Extracts from this document...

Introduction

Investigating the effect of light intensity on the rate of photosynthesis. Aim: We are going to investigate the effect of changing light intensity on the rate of photosynthesis on Eloden pondweed. Factors affecting the rate of photosynthesis. 1. Heat-high temperatures can destroy enzymes. Very low temperatures slow enzymes down. 2. Light intensity- high light intensity increases photosynthesis. 3. Carbon dioxide-high levels increase rate of photosynthesis. Variables- things can change. What will we measure? * The number of oxygen bubbles produced in a given time. * Variables- distance from the lamp, measure the temperature of the water, volume of water, length of the plant. ...read more.

Middle

What I will keep the same. * The amount of pondweed. * The amount of sodium hydrogen carbonate. * I will not change the 5 measurements. * The amount of water. I can make the results as reliable as possible by doing more than 3 repeats and a range of 5 measurements. To make sure I have enough results to make a graph, I will do 5 repeats. Prediction. I think that the pondweed will start to photosynthesise when the light is shining on it. I also think that the hydrogen carbonate solution will help release the CO2. ...read more.

Conclusion

Evaluation. There are no results that do not fit in with the pattern of results. All the results seem to fit with each other properly. This tells me that the experiment was a success and the results are reliable. To make my experiment more accurate, I could have put the light at more than 5 different lengths. Results. Distance Time Bubbles 1 Bubbles 2 Bubbles 3 Bubbles 4 Bubbles 5 Temp. 10 1 min. 79 77 81 85 78 21 20 1 min. 57 53 52 55 56 21 30 1 min. 47 46 48 47 48 21 40 1 min. 40 41 41 42 40 21 50 1 min. 38 39 39 39 37 21 ...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. The effect of light intensity on the rate of photosynthesis

    A nuclear envelope surrounds the nucleus. Chlorophyll pigments absorbs the light energy and convert it into food. This is why it is called photosynthesis. So by using the light energy the plant manufactures its food. Diffusion of gases in leaves Aim My aim is to carry out an investigation into photosynthesis.

  2. Investigating the effect of temperature on the rate of photosynthesis

    As the temperature increased from 0oC to 22oC on graph 1, and 0oC to 24oC on graph 2, the enzymes gain more kinetic energy, therefore colliding and binding with the substrate at a faster rate and also with more energy.

  1. Investigate the effect of light intensity on the rate of photosynthesis in an aquatic ...

    They are as follows overleaf. 1: Pond weed shall be left to adjust to new light intensity in between distances for 2 minutes. The reason for this is to gain a more reliable result of the outcome variable. (This factor was the main reason for the preliminary results being so similar)

  2. How temperature affects the rate of photosynthesis.

    All other factors which might ideally affect the rate of photosynthesis will be kept constant. These are shown below. The factors that will be kept the same are: Variable How will it be kept constant Light Intensity The light intensity would be kept constant throughout the experiment using the same lamp for each repeat.

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