Why do leaves changed colors in the fall?

Answer 1

As autumn approaches the plants reabsorb all the possible nutrients in their leaves, moving this into the rest of the plant. They can reabsorb the components of chlorophyll but not the other pigments in their leaves, so the leaves are left with their residual colours. After this is done the leaves are "sealed off" at their bases and they begin to dry and fall. The plants do this so that their branches are not burdened with leaves when the winter storms come. If they had leaves in winter the force of the wind could uproot the tree or break branches.
leaves change colour in the fall because that colour is actually their normal colour. in summer, when the sun is out, the leaves make a cycle of photosynthesis and chlorophyll is what makes the leaves change green.
When the days become shorter and the nights become longer, trees begin to hoard nutrients and seal off their leaves from receiving new chlorophyll. The sun will contunue to burn away the chlorophyll, and when it's all gone other pigments, which have always been in the leaf, will finally have the chance to shine through. Some leaves have more yellow pigments (carotenoids), while other have more red (anthocyanin).

Answer 2

• A leaves

Answer 3

As autumn approaches the plants reabsorb all the possible nutrients in their leaves, moving this into the rest of the plant. They can reabsorb the components of chlorophyll but not the other pigments in their leaves, so the leaves are left with their residual colours. After this is done the leaves are "sealed off" at their bases and they begin to dry and fall. The plants do this so that their branches are not burdened with leaves when the winter storms come. If they had leaves in winter the force of the wind could uproot the tree or break branches.
leaves change colour in the fall because that colour is actually their normal colour. in summer, when the sun is out, the leaves make a cycle of photosynthesis and chlorophyll is what makes the leaves change green.
When the days become shorter and the nights become longer, trees begin to hoard nutrients and seal off their leaves from receiving new chlorophyll. The sun will contunue to burn away the chlorophyll, and when it's all gone other pigments, which have always been in the leaf, will finally have the chance to shine through. Some leaves have more yellow pigments (carotenoids), while other have more red (anthocyanin).

Answer 4

"During the summer, leaves are green because chloroplasts contain the green pigment chlorophyll. Chlorophyll is not a very stable pigment, and as it breaks down, metabolic energy (ATP) is needed for enzymes to rebuild it. As the hours of sunlight lessen in the fall, the energy needed to rebuild chlorophyll is not as plentiful. Further, enzymes are working at a reduced speed because of lower temperatures. Therefore the amount of chlorophyll in leaves slowly disintegrates. When that happens, we begin to see the other pigments in the leaves." -Inquiry into Life-

Answer 5

When the days become shorter and the nights become longer, trees begin to hoard nutrients and seal off their leaves from receiving new chlorophyll. The sun will contunue to burn away the chlorophyll, and when it's all gone other pigments, which have always been in the leaf, will finally have the chance to shine through. Some leaves have more yellow pigments (carotenoids), while other have more red (anthocyanin).

More: http://inexpensivetreecare.com/leaves-change-color-fall

Answer 6

When the air gets cooler and the nights get longer, the trees begin to cut their leaves off from nutrients so that they can do their own version of hibernating. During the Summer growing season leaves are full or chlorophyll, which gives the leaves their green color. The sun essentially burns it away while the tree continuously replenishes it. Untill Autumn, green chlorophyll dominates yellow carotenoids and red anthocyanin. But, once the tree seals off its leaves and the amount of chlorophyll they have is burned away, the other pigments that have always existed in the leaves can finally show through.

Read more: http://inexpensivetreecare.com/leaves-change-color-fall/