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Investigate plant nutrients

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BY XXX For plants to grow they need more than just Carbon Dioxide, water and sunlight. Although they can though can make sugar from just these three things. Plants need protein; to make protein (for its structure and enzymes) the plant needs to take in nitrates. The nitrates are used to change the sugars into protein. An example for this, Chlorophyll is the green pigment in Chloroplasts, which absorbs sunlight for photosynthesise the Chlorophyll contains Magnesium. If the plant cannot take in Magnesium salts through its roots, it cannot make Chlorophyll to fill the chloroplasts. Without Chlorophyll, the plant will become yellow and it will be unable to photosynthesise, so it will not be able to tarn Carbon Dioxide and water in to sugar. Here are some other minerals needed by plants that are used to grow: * Nitrogen is needed for healthy leaves and energy. * Phosphorus for healthy roots, and potassium helps, the plant to grow flowers and fruit. If one of these vital elements is missing, the plants will not be able to grow properly. My aim is to investigate plant nutrients, I will measure the growth of four wheat seedlings, over the time of 5 weeks. ...read more.


3. A solution that contains no Nitrates. 4. A solution witch contains no Magnesium. I will then wrap the test tubes in aluminium foil, to exclude the light, so that green alga will not be able to grow in the test-tube, so it should not impede in the experimentation. I will then situate the four test tubes into a test-tube rack. I will then place the rack indoors in a sunlit place, and then leave them there for 5 weeks, each week I will check on them, and measure the growth (length) and complexity of the leaves and the roots. Week 1 In week, one I put the seedlings into the test tubes. Week 2 After the first week, all of the seedlings have grown. The shoots and roots have become larger and more complex. The seedlings have rooted and secured them selves the cotton wool, and there roots have grown down into the solutions. Week 3 There are no results for week 3, because we were all on Half Term. Week 4 After the third week, mostly all of the seedlings have grown larger. The shoots and roots have become larger and more complex. ...read more.


and its leaves will be yellow from the bottom upwards and small' although my results and the rest of the class's results do not do this. I think that my experiment did not work out that well, because of this anomalous result for the wheat seedling that was supposedly growing in the solution with no Magnesium, but it might not have been the solution with no Magnesium. It also did not work out well because I only recorded the length of the shoots and roots once a week, and because of half-term was in the middle of when the seedlings where growing, I in total only got 3 results. If I was to do this experiment again, I would do it more thoroughly, for example, I would plant 25 wheat seedlings in each of the four solutions and then measure the seedlings each day for 6 weeks, instead of only one seedling for each solution. This type of readings will give me a better set of results, because is there are anomalies results from one or two of the plants, they will not have a big effect on the overall result. GCSE BIOLOGY book D.G. Mackean 1986 ?? ?? ?? ?? XXX Page 1 of 12 04/05/2007 ...read more.

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