• 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

    that corresponds to a 5% probability that chance could have produced it- in the table I can be at least 95% confident that the difference between the means is significant. T- test for 35oC and 65oC 1. Mean volume of oxygen released at 35oC = 34.27307692.

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

    amount, or they were at a large size, or that they were given off too rapidly to count, I would measure the volume of oxygen in my actual experiment. I set the equipment up as in diagram b. The results of my preliminary procedure are as follows below.

  2. How temperature affects the rate of photosynthesis.

    the length of the air bubble. Made sure the result is as accurate as possible by minimising human errors. 16. Repeat with the same elodea 2 times with the same temperature. (Same elodea should be used as it has the same amount of leaves and therefore the surface area available for photosynthesis is the same Repeating the experiment twice would increase reliability of the results)

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