why do leaves turn colors in the fall?
956897
Leaves turn colors in the fall because the tree stops supplying the leaf with water.  This stops the process of photosynthisis which is where the chlorophyll in the leaf changes sunlight into energy.  The green chlorophyll start turning yellow, red and brown for lack of food.  The leaves fall off the tree and die, allowing the tree to store water for winter and live on until spring.
339843
All things are appear black if they are not lit.  Our eye sees black where there is an absence of light.\n\nRegarding sunlight specifically.  Look at flowers or plants in your home at night.  They don't appear black in artificial light do they?\n\nThe substance that most plants use to absorb light is called chlorophyll.  It happens to be green.  However there are lots of other things in plants that have other colours.  In the leaves they tend to be masked by the predominance of chlorophyll.\n\nAs a plant starts to die,it looses its chlorophyll and the other colours become more visible.  That is why fall leaves have different colours for different plants.\n\nAs a side note, the colour you see on an object is actually the light that is not reflected from a surface.  So something that we see as green has actually absorbed most of the red light reflecting, to your eye, only green.
208500
Perhaps the plants transpiration processes of; photosynthesis, CO2, & nitrogen along with other conditions, ie. H2O temp., Ph level, UV length of intensity play a part of the chemical transformation of plant material to become reddish in color.  Ideally, a micro nutrient of Fe (iron) would make a difference but not certain.
1036658
When sunlight travels through the atmosphere, blue light scatters more than the other colors, leaving a dominant yellow-orange hue to the transmitted light. The scattered light makes the sky blue; the transmitted light makes the sunset reddish orange. \nI could go into explaining it, but I'm too tired at the moment. Check out here:
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.
643333
There are two reasons for it-\n1-Ageing resulting into decomposition of pigment. \n2-digestion of cyoplasm due to lytic enzymes and oxidants.\n3-Withdrawal of nutrient and necessary material from leaf to plant.
1146634
Dusty, pale brown... I've been there.  Can't call it blue or gray, they are both calm and relaxed colors.  Depression is like perpetually being at the end of autumn.  Things you recognize that should be full of life, aren't.  The grass, the leaves, pale shadows of once known glory.  You can't even capture hope, because you know winter must come before the green will return.
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
851355
Spring & Fall - Spring because it shows the 'rebirth' of all the trees and flowers, gives us something to look forward to in the summer.  Fall because of the beautiful colours God paints on the trees, gives us the knowledge that after winter is over, there will be another 'rebirth'.
147139
Autumn is actually the more common name for this season worldwide, and comes from a french word, which derives from a Latin word, and that apparently from an Etruscan word. \n\nFall is more common in North American English now, although it used to be more common in general English. It comes from a shortening of the expressions "fall of the year" and  "fall of the leaf", as one might expect.\n\nWinter comes originally from Scanadanavian words for the season, and possibly is connected to the words for "water" and "white". \n\nSpring is a shortening of the expression "spring of the leaf" to describe the season a few hundred years ago. Before that, in English it was called Lent. \n\nSummer probably originally comes from the Sanskrit word for half year.
1025313
I was interested by this so I did a bit of research.\n\nApparently:\n\n"When the air is clear the sunset will appear yellow, because the light from the sun has passed a long distance through air and some of the blue light has been scattered away.  If the air is polluted with small particles, natural or otherwise, the sunset will be more red."\n\nSo, I suppose the answer would be a more 'orange' sunset, and possibly less vibrant.  Wikipedia says: the "Color of a sunset may be enhanced by atmospheric phenomena such as clouds, smoke and smog."
872592
Well, you know that a tree's leaves turn brown in the winter. There is a reason for that. What makes a tree's leaves green is chlorophyll. All during spring and summer a tree is flooding it's branches and leaves with chlorophyll and the combination of sunshine and rain creates photosynthesis. This creates more chlorophyll. \n    During the winter months a tree stops sending chlorophyll to the branches and instead stores it and lives on it all winter until spring.
816928
Autumn is a second spring when every leaf is a flower. \n\nFiery colors have begun their yearly conquest of the hills.\n\nOne kind word can warm three winter months. \n\nNo shade, no shine, no butterflies, no bees,\nNo fruits, no flowers, no leaves, no birds—November\n\nBare November\n\nThirty days hath September, April, June and November
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..
489914
Chlorophyll is a rather complex and most of all large molecule, which means that the pure substance will be a solid.   In a leaf the chlorophyll is in solution.\n\nLeaves turning brown most likely involves encymatic digestion of parts of the molecule. The core construction of chlorophyll is quite hardy - a flat system of five- or six-atom rings with a central magnesium ion held in place by nitrogen atoms pointing to it in a square. (Hemoglobine and one of the vitamins have a similar basic structure, hemoglobine with iron in the centre and the vitamin with cobalt.)\n\nYou can dry a leaf and keep the chlorophyll intact at temperatures up to 120°C without any browning effect. Such a dried leaf will remain green, unlike a wet leaf where encymatic digestion will destroy the pigment.\n\nThe leaf will turn brown at temperatures where paper also begins to turn brown - when the cellulosis of the plant cells begins to split off water. This may start around 451°F...
53581
Autumn, because of the richness of the colors. I love the oranges, reds, yellows, and browns of the leaves turning...the crunch of leaves on the grass...preparing for the holidays...the cooler weather. I'm a "cold weather lover", for sure. The autumn air is fresher, the skies are bluer, and it has good memories for me.
38560
Leaves are green because they have a substance called chlorophyll in them.  Chlorophyll molecules absorb blue light and some red light with the other colors reflected which results in the green color seen in leaves.