• 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. Investigating the effect of Light Intensity on Elodea.

    As the lamp is moved closer to the plant, the light intensity increases- i.e. more of the light rays fall onto the plant's leaves. When light falls on the leaves, the energy is absorbed by chlorophyll, which is inside cells called chloroplasts.

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

    E5.b Main sources of error The main sources of error were from temperature fluctuations during the experiment, the unsteady flow rate of carbon dioxide gas after it had been produced, from the conical flask to the gas syringe. This resulted in the build up of gas between the times measurements were made and recorded.

  1. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    Internal factor: * Concentration of photosynthetic pigments - The greater the concentration of photosynthetic pigments the greater the amount of light that can be absorbed. This has an affect on the rate of photosynthesis in the same way as light intensity, as the pigments absorb the light utilised in photosynthesis,

  2. How temperature affects the rate of photosynthesis.

    To ensure fair test, the same test tube rack or test tube racks of the same material should have been used. Digital clock The digital clock was accurate to 0.01 seconds. This was a very reliable result as the degree of accuracy was high.

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

    This is quite a significant difference therefore the results for 55 degrees were slightly inaccurate. For the results for 65 degrees the maximum difference for the set of 3 results is 1.24mm3/min. This is also slightly inaccurate as there is a significant difference.

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

    11.) Proceed to the data analysis stage. Results: Distance (cm) Light Intensity (LUX) Bubbles per Minute Average bubbles/minute 1 2 3 0 (off scale) 240 249 251 246.7 5 11,000 201 222 214 212.3 10 5,800 183 185 188 185.3 15 3,570 154 152 158 154.7 20 2,320 128 118 124

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

    go over the optimum temperature of the enzyme, although chemically you are increasing the chances of increasing the volume of oxygen, you are also increasing the chances of the breakdown of the three-dimensional structure of the enzyme. As the heat in the system increases, the vibrational energy of the entire rubisco molecule also increases.

  2. Absorption Spectrum of Chlorophyll.

    then tested one week later using the same dilution factor of 20. Figure 14. Effects of Storage on Absorption Spectrum Figure 14 shows that despite identical dilution factors, corresponding absorbance readings were consistently higher after one week. One reason for this trend could be the rapid evaporation of the acetone solvent (which has a relatively high vapor pressure)

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