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The Effect Of Light Intensity On The Rate Of Photosynthesis

1641 words - 7 pages

How light intensity effects theRate of photo synthesis.AimThe aim of my experiment is to find out how light intensity affects the rate of photosynthesis.PredictionI predict that as the light intensity increases that the rate of photosynthesis will increase in proportion, so for example if you increase the light intensity from 10cm away to 20 cm away form a stationary plant. There for the rate of photosynthesis will decrease proportionally with the distance of the light from the plant (in this case a half). This means that as the light moves away then there is less light given to the reaction for photosynthesis to happen.My theory behind this is the following;Photosynthesis is the process that plants use to create energy for themselves.It is best described from the following equationWater + carbon dioxide sunlight glucose + oxygenOrsunlight6H O +6CO C H O +6O (The balanced equation)glucose is the resulting energy that is needed by the plant to grow and survive. Oxygen is the waste product that is given out via the stomata pores when they become turgid, this is during the process of respiration.Water is taken in via the root hairs which stick out in to the soil, these are located on the roots themselves, because of these root hairs this gives the plant a bigger surface area in which it can absorb more water. Water is essential for the process of photosynthesis and also to stop the plant from wilting, because plant cells take up water via osmosis which makes them tight or turgid and so the plant stays upright, but if there is no water in the cell then the cell becomes flaccid and loose causing the plant to wilt and die. this is the same with the stomata pores except when they are turgid the pore opens and when flaccid the pore is closed(Root hairs also collect minerals and nutrients for the plant through active uptake).Carbon dioxide is nessacery for the reaction of photosynthesis to take place, it gets in to the plant as one of the gases in air which then diffuses through the stomata pores (which have to be turgid to let it in and so need water for osmosis).At the same time as this the left over water vapour and oxygen are diffused out also through the stomata which again have to be turgid to let it out.And finally sunlight is needed for the process of photosynthesis to take place. This is obtained by firstly the sunlight shining down on a plant, which gives the energy for the reaction to take place. It is taken in by the green pigment in all plant cells called chlorophyll, which is located in the chloroplasts of the cell. With out this then even if the plant had all the nessacery reactants the photosynthesis would not take place.I also back my theory up using the following quote"Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. The chemical equation for...

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