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

Do different coloured wavelengths of light affect the rate of photosynthesis in Canadian Pond Weed?

Extracts from this document...

Introduction

Do different coloured wavelengths of light affect the rate of photosynthesis in Canadian Pond Weed? Aim; For the aim of this experiment I am trying to discover if different coloured wavelengths of light affect the speed of photosynthesis in Canadian pond weed either speeding up the rate of photosynthesis or prolonging its effects, or even in some places stopping it take place completely. Prediction; I predict that the different wavelengths of coloured light will affect the rate of photosynthesis, for example I believe that when there is a green filter on the light there will be a very slow rate of photosynthesis, almost no reaction at all because pond weed is green and so this shows me that pond weed does not absorb green light it refracts it yet absorbs all the other coloured wavelengths. I also believe that photosynthesis will not occur very fast with a similar colour to green such as yellow as these are next to each other in the colour spectrum. I believe that photosynthesis will react much faster with colours at the end of the spectrum such as red and blue as they are the two extremes of the colour spectrum, infrared and ultra violet. As these two coloured wavelengths are the furthest away from the green wavelength I believe they will increase the rate of photosynthesis in the pondweed. The light wavelength diagram shown below emphasises that infrared and ultra violet are the two coloured wavelengths of light furthest away from the green coloured wavelength. ...read more.

Middle

test tube stand * A spatula * A Stopwatch Method; Firstly we had many practice experiments just to get used to using the pond weed and giving us a chance to discover some variables that we could change for the practical this coursework is based on. One of these experiments was a change of temperature to see if that affected the rate of photosynthesis this was a very difficult experiment as we did no have access to an electronic water bath and so had to control the temperature by using a Bunsen burner which was very challenging so we were not advised to use temperature adjustments in this experiment but to keep the whole experiment at room temperature. We then did a final practice experiment which was going to be the same as the practical this coursework is based on. In this experiment I did encounter some problems but I did overcome them so the method for the final practical is written below. I collected four samples of pond weed each of six centimetres in length and placed them in a beaker. I then collected four boiling tubes and filled them with water and placed one of the four different coloured filters round each tube. I then collected a lamp and positioned it on the first of the four boiling tubes. I took one of the samples of pondweed and cut of a very small section from one end. ...read more.

Conclusion

To solve this problem I would surround the experiment with a reflective material such as tin foil which will stop light being lost and unfiltered light coming into contact with the pondweed. Secondly the temperature was the second problem I faced. With the temperature not being at a constant the results weren't accurate. The temperature also affected the rate of the reaction. I would solve this problem by completing the experiment in a room where the temperature could be kept at a constant thus recording more accurate results. The third and final problem I encountered was the quality of the filters I used. As the filters weren't a very good quality they may have let through some other wavelengths of light. This would have affected my results as if other wavelengths of light were aloud to pass through rather than just the filtered light it may have sped up or slowed down the rate of the reaction. To solve this problem I would use top of the range filters that only allow through the correct colour wavelength. There was one anomaly which was the lack of bubbles the red filter produced, although the bubbles were very large the amount of bubbles was disappointing compared to what my teacher said we should expect. This could have been due to several things such as a poor piece of pondweed or a very poor quality filter. I believe that I could have improved the coursework by spending more time on writing up the coursework and by doing more detailed practical experiments in the lesson time provided. Tim Shipway 11P ...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. Marked by a teacher

    Investigate the relationship between wavelength of light and the rate of photosynthesis using pondweed.

    3 star(s)

    The only light that chlorophyll absorbs is at the end of the visible light spectrum. No green light is absorbed because that is transmitted and reflected back. The light intensity, colours and wavelength, which are not the right ones can hinder photosynthesis.

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

    (?x)2 = (445.55)2 n 13 = 15963.52327 16820.3291 - 15270.36942 Sx = 12 = 129.1633067 = 11.36500358 At 65oC: Mean: 64.08 = 4.929230769 13 Standard deviation at 65oC: ?x2 = 649.8602 (?x)2 = 64.082 n 13 = 315.8651077 Sx = 649.8602 - 315.8651077 12 Sx = 27.83292436 Sx = 5.275691837

  1. How temperature affects the rate of photosynthesis.

    Make sure the elodea is cut underwater. (Elodea has to be immersed into the water so that no air bubbles enter the tubing and affect the volume of gas released. Elodea should be cut underwater to make sure no air bubbles are formed.

  2. Investigate the affect of light colour (wavelength) on photosynthesis.

    Some colours of visible light are not absorbed such as green. Green instead is reflected into our eyes that tell us that the plant is green. This is because the chlorophyll is green. But other colours such as purple, yellow and red closer tare absorbed but at different amounts.

  1. Investigation of Photosynthesis in Pond weed

    0.2 0.1 0 120 1.4 1.1 0.7 0.3 0.2 0.1 0 150 1.8 1.3 0.8 0.4 0.2 0.1 0 RESULT SET 2 0 5 10 15 20 25 30 0 0 0 0 0 0 0 0 30 0.4 0.4 0.2 0.1 0.1 0 0 60 0.7 0.6 0.4 0.3

  2. Free essay

    Biology Coursework

    If I use less than needed than the colour might not change when it's supposed to, this would lead me to obtaining inaccurate results. The amount of ethanol used will play a major impact, if ethanol removes chlorophyll from a leaf, a smaller amount of ethanol might not be able to eliminate any chlorophyll present in the leaf.

  1. Study the condensation of steam at different temperature levels

    In the chemistry labs for experiments using kwikfit apparatus, we often use heating mantles to heat up samples of chemicals ready for refluxing or distillation, this is perfect as the heating mantles are totally adjustable to the temperature of the water and I'm fairly certain will produce a more constant jet of steam.

  2. Absorption Spectrum of Chlorophyll.

    The comparison of one spinach extract with one okra extract indicated that the two spectra were not statistically different. It was expected that the two spectra would be significantly different since spinach was expected to have a higher ratio of chlorophyll a : chlorophyll b than okra.

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