a student collects a few leaves to find if pigments , chlorophll a and b are present.what are the procedures?
966385
just fyi i would have made this a biology question but anyway, chlorophyll a and b would be present in both leaves its not one or the other.  this sounds like homework don't you think that you should be figuring this out on your own.  i'll give you a couple hints.  you need a solute so that you can separate the pigments.  the pigments  will travel farther if the are less soluble.  Anyway thats all i'm giving you good luck.
47605
a)purple b)black c) green or hazel
773057
When I was in 9th grade we did a plant project. I bought two small plants that were the same. One of the plants I left it in the sun watered it everyday and took good care of it. The other we put it in a dark place and also watered it everyday and also took good care of it. I did it for two weeks. Everyday I would make an observation of the lenght of the plant and the leaves it dropped and wrote it down. Then on a posterboard I did 4 large graphs. Two of the graphs were the length it grew each day for each plant. And the other two I graphed how many leaves would fall out of each plant. And when I presented it in front of the class I brought both plants and my conclusion of the project was the affect the sunlight has on a plant. It really hopes that works. By the way I got an A+ on it.
633263
1. The leaves of a plant using photosynthesis...The leaves are healthy and green.\nSorry, but I thought that I could think of more than that, but I tried.
792968
chloroplast contain membbranous structures which are pilled in stacks called grana\ngrana contain the light-trapping pigment chlorophyll. chlorophyll is the most abundant photosynthetic pigment in plants\ngrana are embedded in a gel-like matrix called stroma\nstroma is the site where the dark reaction occur and the enzyme responsible for the dark reaction of photosynthesis also found here\nstarch grains which act as a temporary storage for the products of photosynthesis are also found in the stroma\n\nfor more extra information try to find it at wikipedia
694969
chloroplast has two membranous wall enclosing inner contents\nIn side we can see green colored grana and colour less stroma\nGreen colored grana had piles if thylocoids which are rich ingreen pigment chlorophyll a and chlorophyll b.Both theseare involved in light phase of P.S\nin the colou less stroma many enymes are present They are useful for the dark rreaction or dark carboxylation
887525
Cholorphyll a and Cholorphyll b are nearly idetntial however a slight structural difference exists between them, which gives them different absorption spectra and hence different colors. If sunlight hits Chloropyhll b it is then passed to Chlorophyll a. Chlorophlly b is yellow-green and so hence it absorbs all colors other than yellow green.
742543
See if these fit\n\n1) bright field\n\n2) cilia\n\n3) contrast? = staining
729932
The photosynthetic pigments on the chloroplasts (more specifically, the thylakoid membranes) work by absorbing light.\n\nThe most abundant photosynthetic pigment is chlorophyll A and B, which like to absorb every color except green, which is reflected :)\n\nBecause there's a lot of green-reflecting chlorophyll, the chloroplasts appear green. Of course there are also pigments that reflect other colors (e.g. carotene reflects orange), but there are far fewer of those so we still see green.
38656
cellouse is the awnser its a polysacharide. trust me chloroplasts are in the cell not part of the cell wall. IM in AP bio
443130
some have a bleaching agent in
11528
Why questions are often difficult to answer but you seem to have a very \nreasonable answer to explain your observation. To really confirm that the \nnongreen parts of your variegated leaves do not photosynthesize as much as the \ngreen parts, you would need to do one of the following:  \n\n1. Starch test the leaves to show that there is little or no starch in nongreen \nareas and lots of starch in green areas. This may not work on all leaves \nbecause some plants do not accumulate starch in their leaves but export \nphotosynthates as sucrose.\n\n2. Extract chlorophyll from green and nongreen areas to show the nongreen areas \nhave little or no chlorophyll while green areas have lots of chlorophyll. Just \nbecause a leaf is nongreen does not mean that there is not chlorophyll there. \nIn some nongreen leaves, other pigments such as carotenoids and anthocyanins, \nsimply mask the green chlorophyll.\n\n3. Measure photosynthesis in leaf disks cut from green and nongreen areas of \nthe leaf to show that photosynthesis occurs in green but not nongreen parts.
656703
In thin layer chromatography or TLC the stationary phase consists of a thin layer of adsorbent like silica gel, alumina, or cellulose on a flat carrier like a glass plate, a thick aluminum foil, or a plastic sheet.\n\nThe process is similar to paper chromatography with the advantage of faster runs, better separations, and the choice between different adsorbents. TLC is a standard laboratory method in organic chemistry. Because of its simplicity and speed TLC is often used for monitoring chemical reactions and for the qualitative analysis of reaction products.\n\nTLC plates are made by mixing the adsorbent with a small amount of inert binder like calcium sulfate (gypsum) and water, spreading the thick slurry on the carrier, drying the plate, and activation of the adsorbent by heating in an oven. The thickness of the adsorbent layer is typically around 0.1–0.25 mm for analytical purposes and around 1–2 mm for preparative TLC.\n\nSeveral methods exists to make colorless spots visible:\n\nOften a small amount of a fluorescent dye is added to the adsorbent that allows the visualization of UV absorbing spots under a blacklight ("UV254"). \nIodine vapors are a general unspecific color reagent. \nSpecific color reagents exist into which the TLC plate is dipped or which are sprayed onto the plate. \nOnce visible, the Rf values of the spots can be determined. These values should be the same regardless of the extent of travel of the solvent, and in theory are independent of a single experimental run. They do depend on the solvent used, and the type of TLC plate.\n\nThin layer chromatography is also used in finding which pigments a plant contains. By taking extract of the plants cellulose and applying the technique, one can adequately find the pigments. It may also be used to detect pesticides or insecticides in food, or in forensics to analyze the dye composition of fibers.
1097506
Look in the plant plot!!
746248
I recommend the following link:\nhttp://www.amazon.com/Phytochemical-Methods-Modern-Techniques-Analysis/dp/0412343304\n\nYou will need to purchase a lab guide or consult with a Life Sciences Dept. for further assistance
672889
>>>why most common chlorophyl on most leaves is the the\n>>> green one? not the red one, or other color instead...\n\nChlorophyll only comes in one colour: green. There are red and yellow accessory pigments, but they are not chlorophyll and serve only to transfer energy to chlorophyll. The chlorophyll is still required to use those accessory pigments.\n\nAs for why chlorophyll predominates, it is simply because chlorophyll blue light, and red wavelengths are the most common wavelength in sunlight. Or to put it another way, chlorophyll has evolved to absorb that part of the sunlight where the most energy is.\n\nIf leaves were any colour but green they would be wasting most of the energy in sunlight.
785588
1.Though the Japanese maple didint show green color, it has   chlorophyll in its leaves surely, the % is lesser to be visible, all reactions in the photosynthesis cycle except the reception of sunlight (photons in quantum packet) are carried over in pigments other than green i.e, chlorophyll also.\n2. As said above all green leaves has other pigments also, such as anthocyanin giving red, xanthophyll giving yellow, their different proportions to create shades between red and yellow, e.g orange. Once the leaves decided to die, ie, abscission process the water and food through vascular bundle stops by a developing barrier between plant and the leaf. Once fuel is stopped chlorophyll begin to disintegrate and decolorize, thus the other hidden colors show up depending upon their concentration in leaf.