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How Light Intensity Effects The Rate Of Photosynthesis.

1890 words - 8 pages

In my investigation I am going to establish the effect of changing light intensity on the rate of photosynthesis.What is Photosynthesis?Photosynthesis is how plants get their food. The reasonwhy plants have leaves, roots or being green is all linkedto photosynthesis. In photosynthesis, a plant takescarbon dioxide from the air and water from the soil anduses the light from sunlight to turn them into food.Photosynthesis occurs only in the presence of light, andtakes place in the chloroplasts of green plant cells.Photosynthesis can be defined as the production ofsimple sugars (glucose) from carbon dioxide and watercausing the release of sugar and oxygen.Oxygen is also produced in photosynthesis, plants don'treally need oxygen so they give it out as a waste productbut saves a little bit to use for respiration. The sunlightis absorbed by a green pigment called chlorophyll.Most of the glucose is turned into a substance called starch.Word equation for photosynthesis:Light energyCarbon dioxide + Water Glucose + OxygenChlorophyllWord equation for photosynthesis:Light energy6CO + 6H O C H O + 6O2 2 Chlorophyll 12 6 2My aim:My aim is to determine the effect of light intensity on the rate of photosynthesis. To accomplish this I will have to control the amount of water, carbon dioxide and light. Also the distance of the light will have to be controlled by undertaking this there should be different levels of oxygen escaping the plant. The plant will be soaked into water so the oxygen can be measured easily. The oxygen will be measured by the amount of bubbles produced from the plant for a certain amount of time.Investigate the factors of - Independent variable - I am changing the light intensity.- Dependent variable - I am measuring the rate of photosynthesis.- Controlled variable - I am going to keep the level of carbon dioxide the same.Preliminary experimentBefore doing my actual experiment I have decided to do a preliminary investigation; I have done this to overcome errors and mistakes. I have produced a table and graph to show the effect on the rate of photosynthesis when light intensity is increased or decreased.PredictionFor this experiment I predict that the further the light is from the leaf the fewer bubbles will be produced. I have come about this answer because for a fact photosynthesis occurs in light only and the rate of reaction is quicker in a warmer condition, so therefore if this condition is colder then the results will be the opposite which is that fewer bubbles (oxygen) will be produced.TableDistance Amount of bubbles Average Rate1 2 3 43cm 18 18 19 18 18.25 36.56cm 18 20 19 17 18.5 36.59cm 17 18 15 17 16.75 33.512cn 11 15 9 11 11.5 2315cm 11 11 12 12 11.5 23The table above shows my results after I completed the preliminary experiment. I counted the bubbles 4 times as you can see on the tables to be sure and make the experiment fair, the table shows that the higher the light intensity the faster the rate of reaction, this tables proves my...

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