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

Experiment to investigate the effect of light on the organic plant elodea.

Extracts from this document...

Introduction

Experiment to investigate the effect of light on the organic plant elodea. Aim: To calculate the rate of photosynthesis from the number of oxygen bubbles produced by the plant. Photosynthesis: The process by which green plants use the sun's energy to build up carbohydrate reserves. Plants make their own organic food such as starch. Plants need Carbon dioxide, water, light and chlorophyll in order to make food; and starch and oxygen are produced. Carbon dioxide and water are the raw materials of photosynthesis. The equation of photosynthesis is: 6CO2 + 6H20 ==> C6H12O6 + 6O2 Carbon dioxide + water ==> glucose + oxygen Green plants need sunlight. They use the light energy to make a sugar called glucose. Glucose can be turned into another type of sugar called sucrose and carried to other parts of the plant in phloem vessels. Glucose can also be turned into starch and stored. Both starch and sucrose can be converted back into glucose and used in respiration. ...read more.

Middle

* Take the temperature of the plant by placing the thermometer into the beaker to see if the elodea is at a temperature where it would not be affected by enzymes . * Count the bubbles at one-minute intervals as they appear using the tally counter to record the results. * Repeat the experiment but moving the bench lamp 5cm away each time after 1 - minute intervals to make it a fair test. Preliminary results: Time in minutes Distance of lamp (cm) Amount of bubbles 1 5 34 2 10 128 3 15 192 4 20 161 5 25 111 Table of results to show how many bubbles were produced per minute at 32? 1. Time in minutes Distance in cm Amount of bubbles produced per minute 1 5 82 2 10 79 3 15 73 4 20 67 5 25 61 6 30 50 7 35 41 8 40 38 2. ...read more.

Conclusion

Anomalous results could of also been caused by my counting at a certain angle that would not allow me to see every single bubble as they rose to the surface or the bubbles could have been caught up in the leaves giving us an underestimate of bubbles produced. Using a tally counter helped to count the amount of bubbles that rose. It was a better method than plotting dots on a piece of paper every time a bubble rose because a dot may be accidentally put on top of another. The graphs showed that the further away the light the less bubbles were produced. To get a better graph or set of results the experiment could have been tested. The results could be like this because the plant could of run out of carbon dioxide. Another error could have been the distance between the light source and elodea were not measured to a high degree of accuracy. Overall I think the experiment went well and although the results varied it turned out ok! 1 ...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. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    available for the substrate to bind with, therefore a doubling of the rate of reaction up to a certain point. However, as higher concentrations of enzyme are used, over half the substrate molecules will be bound to enzymes, so the rate of reaction will not double with enzyme concentration, but the reaction will still speed up.

  2. What is the effect on the rate of respiration of yeast cells with glucose ...

    This ensures that all the yeast solution is of the required temperature. It ensures that a fair test is being carried out as the variable is being controlled. The results are, therefore, more reliable. Gas syringe Collecting and measuring volumes of carbon dioxide gas.

  1. Investigation To Find The Effect Of Temperature On The Rate Of Photosynthesis Of Elodea.

    From both graphs there is a best-fit curved line. This means that the rate of photosynthesis increases at an exponential rate. However, my prediction that light intensity is inversely proportional to the distance squared did not fit into my results perfectly.

  2. Investigating the effect of Light Intensity on Elodea.

    In this experiment water will not be a limiting factor as the plant is fully submerged in water. Keep the amount of water in the beaker the same for all experiments. This means that the concentration of carbon dioxide would be the same for all experiments meaning that carbon dioxide

  1. The effects of organic effluent from the seweage on the biodiversty in a freshwater ...

    These conditions may cause the water and its constituents(enzymes) to become disrupted and hence change there tertiary structure and hence lead to harmful effects on the stream life. This will also affect the biodiversty in the fresh water stream. 14.

  2. How temperature affects the rate of photosynthesis.

    whereas at 35 oC it showed the highest within that range for both the graphs. The optimum temperature was predicted to be 37.5 oC but the personal graph showed a peak at 42.7 oC and the graph showing the class averages formed a peak at 43.6 oC approximately.

  1. The aim of this experiment is the effect of temperature on the rate of ...

    From A2 level we learnt about the two different types of photosynthesis and how they occur. The first type of photosynthesis is the LIGHT-DEPENDENT REACTIONS, whereby the plant needs light to be able to carry out photosynthesis to form a carbohydrate and oxygen.

  2. Compare the effect of heavy and light oil on terrestrial plants.

    Marsh vegetation shows greater sensitivity to fresh light crude or light refined products whilst weathered oils cause relatively little damage. Oiling of the lower portion of plants and their root systems can be lethal whereas even a severe coating on leaves may be of little consequence especially if it occurs outside the growing season.

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