how can i test why leaves change color in the fall?
967309
leaves on house plants change colors if they arent properly cared for as well, I've never figured out why this is.\n\nI would check the species of the trees first.  Maybe you can clip a leaf thats green and put it in the fridge to see what color it turns, then try the freezer and see if it changes again.
110839
temperature changes de amount of energy in molecules, which has a direct efect on the amount of light transmited through a  solution and, therefore, afects absorbance.  Also, in chemical analysis, the formation of colored compunds is necesary and if the correct temperature is not set, the compound doesn't form correctly. (just some reaction mechanisms from organic chemistry)\nThe AOAC method for testing nitrate content in water is a good example. If you don't give the reaction the correct temperature, the colored compound will never form and the test is invalid.
319622
it happens when the water says down in the roots in the fall.... water is the food for the leaves.... easier to say then that it's loss of chlorophyll
838815
its fall time all leaves are falling off. if ur tree doesnt re-sprout leaves in spring that could be a problem. use fertilizers and place it in a place where its not very cold.
976391
Fall, I love the change of the leaves. It isn't to hot or to cold. At night it gets a little cooler so it make me want to cuddle.Its just a Great Season..
269519
The test that I'm familiar with is thin layer chromatography.  This process uses the polarizability chararacteristics of each pigment in a plant sample.  In my experiment, spinach leaves are grounded and mixed with anhydrous sodium sulfate and sand.
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.
67486
Colors in the sky occur when dust particles and debris are struck by sunlight rays and that alters their path.\n\nhttp://www.mountainnature.com/Climate/SkyColours.htm
1153857
Summer = very hot and green.  \nFall or Autum = cooler and dry and plants turn colors and leaves fall off the trees and the days get shorter\nWinter = cold dark snow falls and things freeze\nSpring, New life, riot of colors due to flowers and lots of fragrant flowers and it warms up.  lots of rain.
227627
Try a garden nursery. They will have soil testing kits that have test tubes in them.
359262
The color of the plant leaves is what part of light it does not use.\n\nso a green leave uses all of the sun light but not the green wavelength, so it is reflected to your eyes. \nSo a green plant will not grow in green light.\n\nOf course, some plants are not green, but the same idea applies.
915298
The leaves don't exactly "change color."\nThe yellow, red, and brown pigments are there all year long, but are masked by chlorophyll the while the leaves are “alive.” Chlorophyll, made up of tiny green sacks called chloroplasts, is the green photosynthetic chemical most associated with photosynthesis, the process by which plants turn sunlight in to energy.\nStarting in spring Chlorophyll is produced, used, and replaced inside the leaf, keeping it lush and green. In the fall, when nights get longer and days get colder, trees start packing up shop for the winter by shutting down chlorophyll production and closing off the leaves from the flow of sap.\nLeft trapped inside the leaves are other photosynthetic chemicals know as Carotenoids (yellow, orange, and brown) and  Anthocyanins (reds, purples, royal blue). Just like with paints, varying how much of what pigment is in each leaf varies what colors will be produced. How much of what pigmented chemical is left behind depends on a whole host of environmental and biological factors including how much sugar is trapped in the leaf, the ph of the sap, temperature, length of days, intensity of sunlight, etc.
887479
since plants are mainly composed of chlorophyll and chlorophyll is green then the plants tend to be green. but they also have other colors such as red or yellow. thats why when trees shed their leaves in the fall what they are really doing is killing off the chlorophyll allowing the other colors to come out and be noticed.
388858
Water the plants with heavy water (D2O, using deuterium isotopes instead of hydrogen) - put some in the dark and some in the light - and then compare the deuterium content in the starch for light vs. dark
954978
it is the change in pigment colour.All plant cells have organells called plastids .Depending on the colour theyare divided in to3 groups\nGreen colour plastids are called chloroplasts they have chlorophyll pigment\nColored other then green(yellow ,red) plastids are called chromoplasts.They have xanthopyll and carotenois pigments\n\nColour less plastids are called leucoplasts\nThe main charactr of plastids is they can change from chloroplast to chromoplast or to lecucoplast or vice versa\n\nTha t is the reason we can see green bell peppers red and yellow ones\nEven th e leaf colour change in fall is also depends onthe same character
65111
I believe that actually the leaves of plants in the shade are more pale then in the sunlight, not darker. That's because the chlorophil which contained in leaves are not fully used for photosynthesis. The less of usage, the more pale the leaves would be. Probably u know that the leaves look greener if they have enough sunlight.
864820
Depends on the plant species.  Some trees shed their leaves in fall and don't grow them back until the next spring.  Anyway you're thinking wayyyyyyyyy too much about plants at a lunar base.  Anything brought there would most likely be stuck under some kind lamp to simulate light conditions on the earth, so your problem is moot.