• 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.

    This will be done in the following ways: Prediction I predict that the rate of reaction of temperature will increase up to a maximum rate of about 300C. In addition I predict that the rate will double with every rise of 100C.

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

    Processing the evidence Calculating the mean volume of carbon dioxide collected in a set amount of time increases accuracy and reliability of the results, as the experiment is being replicated in the process. Nevertheless, one cannot ever place complete confidence in the accuracy of results achieved in this way as calculating the mean involves using even anomalous results.

  1. This experiment involves using a photosynthometer to investigate how temperature affects the rate of ...

    is immersed in the water. 5. Place the bench lamp 10 cm away from the boiling tube. Ensure the light is directly facing the elodea specimen. 6. After setting all the apparatus up, pull the syringe on top of the capillary tube in order for the water to get into the capillary tube.

  2. How temperature affects the rate of photosynthesis.

    Use of test tube racks doesn't affect the rate of photosynthesis in any way. It just provides a surface to hold the solutions and the elodea in a position to let photosynthesis to occur. But the material that the test tube rack was made of could have affected the rate of photosynthesis as it was a conductor.

  1. Investigating the effect of Light Intensity on Elodea.

    This method would perhaps take longer to do, if the lamp were to be positioned far away from the plant the rate of photosynthesis would be much slower. It would take a considerable amount of time for 20 bubbles to produced at a length of 60cm, but only a

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

    The first reading is almost twice the average. This was the room temperature and therefore the first measurement of the elodea that we took. I believe it was because while we were waiting for the plant to start photosynthesising at a regular rate, it could have already started to photosynthesise.

  1. Absorption Spectrum of Chlorophyll.

    Experimental Absorbance at 645 nm % Deviation in Absorbances Spinach (literature ratio = 4.02? 0.79) 1 0.138 0.221 -37.3 2 0.118 0.196 -39.6 3 0.085 0.135 -37.0 4 0.143 0.245 -41.5 Mean Deviation -38.9 Okra (literature ratio = 1.208) 1 0.222 0.200 10.9 2 0.080 0.069 15.8 3 0.099 0.083

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

    * Oxygen meter will be used to measure oxygen concentrations of one sample. * Seal the second sample in an air tight container, place it in dark at 20 degree celcius for 5 days. This prevents photosynthesis which makes oxygen.

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