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To find out the number of stomata on a leaf and how it changes as the height of the bush increases.

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STOMATA INVESTIGATION Aim To find out the number of stomata on a leaf and how it changes as the height of the bush increases. Prediction I predict that there will be an increase in stomata as there is an increase in the height of the bush, this is because those leaves that are higher up on the bush get more light so they do more photosynthesis so produce more oxygen. Therefore they need stomata to get rid of this waste product. The graph will therefore be linear and go up according to the height of the bush and the amount of stomata. Background knowledge Water + Carbon dioxide --> Glucose + Oxygen 6H20 + 6CO2 --> C6H12O6 + 6O2 For photosynthesis you need light, water and carbon dioxide. This light is captured by the plants from the sun through chloroplasts. The water enters the plant by its roots but moves up by transpiration and carbon dioxide is let in the leaf, as the stomata are little holes in the bottom of the leaf, which open, and close to let in carbon dioxide and oxygen. Transpiration is how the water travels from the root to the leaf through the stem. It controls the amount of water by opening and closing the amount of stomata needed. There is a limit to the number of stomata because too much or too little water would start to wilt and die and also the surface area of the leaf means only a certain amount of stomata can fit on the leaf. ...read more.


As light was a factor in this we also carried out tests on the amount of light the bush gets by using the light metre at the different heights of the bush Method We would get the light metre, go to the same bush from which we took out other data from and take the light readings from each height of the bush. Again we would have to do it three times so that we could take an average so that we could get the best results. Results Height of bush/m Reading 1 Reading 2 Reading 3 Mean light reading 0 193.6 193.6 189.5 192.2 0.5 194.0 194.0 189.0 192.3 1 193.3 193.9 190.6 192.6 1.5 192.4 194.3 191.6 192.8 2 193.0 194.9 192.2 193.4 2.5 193.2 195.1 193.0 193.8 Graphs Analysing evidence and drawing conclusions My graphs show various different things. It is clear that in the graph that is showing the number of stomata on a leaf based on the height of the bush, there is a linear relationship between the stomata and the height of the bush, this is what the line of best fit shows. The line of best fit shows the pattern or trend we (think) we would get if we removed all the measurement errors from our experiment. This graph shows that as the bush gets higher the number of stomata increases. ...read more.


were similar, I think next time I will make sure ALL the leaves are the same size but then again the size of the leaf affects the amount of stomata on the leaf, the greater the surface area the more stomata it can fit on the leaf so next time maybe I will investigate whether or not the size of the leaf affects the amount of stomata on it. I would also make sure that the light metre results were fair, as this time all three sets of results that I took were in different conditions (cloudy/sunny/sunny intervals). The only anomalous results I got were on the height/light part of my experiment which I have tried to justify above, next time it will be more accurate to take the readings in more stable weather. Also relating to the height/stomata part of this experiment I may have chosen leaves that were in a position not receiving enough sunlight, this would obviously influence the amount of stomata on the leaf, so I would have to make sure next time that the leaves were taken from the branch that was furthest out. There were extensions I could have made to this experiment but did not have enough time to complete, I could have compared results on different types of weather and maybe even try and compare results of different types of bushes. Mariam Yasin Herschel Grammar School Stomata Investigation 2002 1 ...read more.

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