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The affect of light intensity on photosynthesis.

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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.

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