how do u measure the content of vitamins or iron in a plant ?
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Check out the methods section of this article: http://freenet.macatawa.org/~rimmer/Vitamin.htm\n\nThere are different methods to measure the content of different nutrients.  One of the most common methods is NIR spectroscopy.  And then there are chemical analyses and preparation techniques to isolate certain nutrients. In short, big time biochemistry going on!
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Different fruits go thru different tests to check for the amount of each nutrient thru small samples from randomly picked fruits from different locations.\n\nA protien test for the proteins, vitamins for each vitamin, etc.
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Peter B has it right -- atomic absorption will do elemental analysis.\n\nAtomic emission spectroscopy is another tack, though a bit more challenging.
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Amount. And location. Iron metal (Fe) has thousands - millions of atoms and is not easily taken into the body. Mineral iron, such from leafy veg plants are in conjunction with other molecules making it easier to absorb. Mineral iron is also more likely to be in different valency's eg Fe2+, Fe3+ etc because in nature different organisms use them for different things.
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look up the periodic table...duh
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spinach\nred meat\nliver\nbeans\ndark leafy greens like kale or collard greens\nBlood iron does not raise quickly, but requires a constant intake of iron rich foods to restore the lost iron.
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nitrogen, phosphorus, and potassium \n\nGood Luck :)
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if you experiment with potted plants, it is likely, that far more nutrient is in the soil, so you will observe nothing. (only some plants do not tolerate too much watering, too cold water, chlorinated water - fresh from tap, ) I suggest you go for hydroponia (plant in water and nothing else) so that you can get somewhere. I also suggest you use seeds so that you have larger number of identical material - lets say each experimental variant will look like three-five  dishes with 50 cress/mustard seeds each.  (TO RULE OUT CHANCE!!! ) you can try different waters and your experiment will still take up the space on one window sill or small desk. You will observe different coloration, growth rate, as the plants will experience lack of nutrients (you can also try different fertilizers, different ammount of it, do chemical tests with your waters). I dont recomment larger seeds than that, because then you will have much nutrients in the seeds themselves.\ngood luck
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the roots absorbed minerals in the soil and the trunk/branches transport the nutrients to the leaves which manufature the plant food through a proccess called photosynthesis by the action of the chlorophyl which is the green color of the leaves, and the sun's ray
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THere are many things you can measure.\n\n1)  pins just only into the skin of the lemon.   at different lengths apart.\n\n2) pins penetrating the lemon into the juicy fiber, so past the skin and past the skin barrier that makes the lemon separate each "compartment"\n\n3) pins embedded into different "compartments (separated by skin.)\n\nAll results will vary.\n\nPostulate most current with pin in same compartment at close distance apart.  Postulate less current if you stick pins in separate compartments.  Postulate no current if jsut penetrating the outer skin but the skin may be surprisingly a decent conductor.
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Measure concentration. Use a dummy (with water only) measuring that with a LabPro probe. Then compare that to a certain volume of a variable soft drink. I did this in high school, hope it works!
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carrots- vitamin A\nbananas- potassium\ncitrus- vitamin C\nwheat- fiber and protein
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Not cabbage! The SPECIFIC indicator used is 2,6-dichlorophenylindophenol (DCPIP) - a blue/purple dye reduced by ascorbic aid to it's colourless form. There is no suitable substitute that I know of, although red cabbage extract is an excellent GENERAL acid/ base indicator. \nIncidently the DCPIP method is useless at determining the Vit C content of blackcurrant juice!
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the rate of photosynthesis can be determined by measuring the rate of either O2 production or CO2 uptake. For right method to determine the rate of O2 produced during photosysnthesis refer the link.\nhttp://web.grinnell.edu/courses/bio/qubitmanual/Labs/PHS/pho.html.
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Depends on the type of plant as to what minerals it needs the most of. \n\nNitrogen, Phosphorous, Potassium, Potash, Iron, Zinc\n\nAlso sulphur, magnesium, manganese, copper and more.\n\nhttp://mgonline.com/fertilize.html
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the roots, the stem, the leaves, and the flower/fruits
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Take timer and thermometer.\n\nHeat the first metal, and check temperature every 5 seconds or so and write the temperature in a table.\n\nDo it with all the metals you want to check and compare the results.\n\nit should take about an hour depending on how many differnt metals you want to check, and it dont cost much.