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The effect of fertiliser on algae.

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The effect of fertiliser on algae This piece of coursework is going to be about the affects of fertiliser on algae. Prediction During this investigation i will be investigating what happens when fertiliser is added to algae. I predict that as more fertiliser is added to the solution, the more algae will grow. I predict this because fertilisers contain the minerals needed to increase plant growth. The nitrates in the fertiliser will help to make protein with carbohydrates as they are used to make cell membranes. Protein is used for growth and repair, so the stronger the solution the more algae will be produced. Method First, I decided which concentrations of fertiliser to use. I decided to use the following concentrations: 0ml (0%), 2ml (20%), 4ml (40%), 6ml (60%), 8ml (80%), 10ml(100%). This will make up the first part of the solution, the rest will be made up of water. For the method I will do the experiment with 2ml of fertiliser, and 8 m of water. ...read more.


For my results, I have to multiply the initial recordings by ten. To get the average, I will use the mean result for each measurement. Safety To ensure a safe and enjoyable experiment I will follow these rules: Wear safety goggles at all times Remain standing throughout Report any spills imediatley Abide the basic lab safety rules Be sensible with all the equipment Fair Test To make sure that this experiment is a fair test, I am going to make all of the measurements as accurate as possible, all of the volumes must be the same. To do this, I will have to use the most accurate measuring tube available. The solutions will have to be left in a safe place where they can't be altered, but also where there is the same ammount of light and temperature. Also, I must ensure that the algae I use is of the same species, otherwise the reproduction rate would be different. If any of those variables were changed then the experiment would be made void. ...read more.


Osmosis is when water moves through the cell membrane and goes into the cell vacuole, pushing against the cell wall, the cell wall stops the cell from bursting. The water moves to areas of lower water concentration helping the cells grow. Since there is no water, this process cannot happen resulting in less algae being produced. This evidence is very reliable because all three results show the same steady trend of a very similar gradient. To extend the experiment I could take different samples at different stages of the experiment. This would perhaps give me a wider range of results, making my experiment more accurate. Also, in future experiments I could change the variable to temperature, light or species. Temperature would change the speed the cells work at. Light would increase photosynthesis, meaning more cells being produced. Different species of algae have different reproduction rates so this would create an interesting range of results. This experiment had no real problems, but using the counting cell was quite hard (this would explain the anomalous result) so my results were not as accurate as they should have been, so an alternative would have been extremley helpful. ...read more.

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