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

The affect of light intensity on photosynthesis.

Extracts from this document...

Introduction

Deniz Guner The affect of light intensity on photosynthesis AIM My aim in this investigation is to try and find out what affect light intensity has on photosynthesis. BACKGROUND INFORMATION Photosynthesis is that plants carry out to make food .Carbon dioxide(CO2) and water(H2O) are the reactants and glucose(C6H12O6) and oxygen(O2) are the products of this reaction . In order for this reaction to occur the energy of sunlight is required . Photosynthesis happens by carbon dioxide getting into the leaf through small holes on the under surface of the leaf called stomata and the water is aquired through the soil by the roots.the reaction involving carbon dioxide and water takes place in chloroplasts.these chloroplasts contain a green chemical called chlorophyll , this is what gives plants their green colouring. The main stages of photosynthesis are the chlorophyll absorbs sunlight energy and uses this to split water into hydrogen and oxygen.this hydrogen is then combined with carbon dioxide to form sugar glucose.the oxygen from the splitting of water escapes as a waste product. ...read more.

Middle

APPARATUS The apparatus required for this experiment is :- A lamp A stopwatch Water Elodea A metre rule A beaker A test tube A funnel DIAGRAM OUTLINE PLAN In this investigation I am going to use a pond weed called Elodea to see the amount of bubbles (oxygen) that are given off when the light intensity is controlled at different distances. PRELIMINARY INVESTIGATION I carried out a preliminary investigation to find out what the best distances are so I can get as accurate and credible results as possible Distance between Elodea and the light source (cm) The number of oxygen bubbles given off 10 87 20 60 30 53 40 33 50 25 60 17 70 0 80 0 90 0 From my preliminary results I have found out that the most sensible distances to use in my experiment are from 10cm-60cm as these were the distances I got results that can be used . ...read more.

Conclusion

on the stopwatch for that particular distance. 9. While the stopwatch is going it is advisable to have one person watching the bubbles at eye level and the other person recording the amount of bubbles (it is easier to record it by tally) 10. Then repeat the last 3 steps on the rest of the distances. 11. After you have done all the distances then repeat the test two more times recording your results as you go along. We do this so that your end result is more accurate then if you had just done the test once. SAFETY These are the safety rules that should be used while carrying out the experiment -No running in the laboratory -When using the Sodium hydrogen carbonate do not touch with your hands use a spachalor . -Tie back long hair -Wear safety goggles RESULTS TABLE Distance between Elodea and the light source (cm) Number of bubbles given off Test 1 Number of bubbles given off Test 2 Number of bubbles given off Test 3 Average 10 61 20 54 30 47 40 28 50 16 60 11 ...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. How does light intensity affect the rate of photosynthesis

    Using my results I could use a formula to convert distance into light intensity although this would only make my graph clearer rather than my results more reliable. I could also use a set of scales to measure the exact amount of Sodium Hydrogen Carbonate going into each test tube

  2. How temperature affects the rate of photosynthesis.

    the results are statistically incorrect. Table of t test values (the values are correct to 2 decimal places): Degrees of freedom Value of t 1 6.31 12.7 63.7 636 2 2.92 4.3 9.93 31.6 3 2.35 3.18 5.84 12.9 4 2.13 2.78 4.6 8.61 5 2.02 2.57 4.03 6.87 6

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

    The process of taking in and giving out gases is known as gaseous exchange. When green plants photosynthesise, they take in CO2 and give out O2. This only happens in daylight when light is available as an energy supply. The exchange of gases in green plants in light is the

  2. The aim of our investigation is to find out how the amount of light, ...

    To allow my experiment to have enough light I will increase the rate of photosynthesis. But making sure the temperature is just right, up to 40 that are neutral for the plant. But at this point the enzymes will be destroyed, if this becomes a limiting factor than the water will be warmed up.

  1. whether or not the intensity of light would affect the rate of photosynthesis

    of the readings I took, as it would reduce the percentage error, by increasing the volumes, I decided that the inaccuracy of maintaining a constant temperature would outweigh any advantages. I am therefore going to perform the experiment at room temperature, checking the temperature frequently, in case the heat given

  2. An Investigation into Species Diversity with distance along a Pingo.

    Method (Sample Number): 1. Two species were chosen to be examined; these were Lesser Hawk Bit and Salad Burnette. 2. The quadrat was thrown and the number of squares in which the two species were apparent was counted using the optimum quadrat size (each species was counted in turn i.e.

  1. Investigate the factors, which affect photosynthesis.

    * Ethanol should not be heated directly as it can be very harmful to naked skin, therefore as I have mentioned before large lab coats and goggles should be worn. * While heating/boiling ethanol, it should be put into beakers that is then placed a large water bath (that is large enough for the beaker to easily fit in).

  2. Factors That Affect Photosynthesis.

    But since the circle is expanding, the circumference increases and the same light energy is distributed along a greater surface. Method: 1. Set up the apparatus as shown in the diagram above but leaving out the pond weed, funnel, test tube, water, and the sodium hydrogen carbonate.

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