when leaves change there color in the fall does that have anything to do with photosynthesis?

Answer 1

Plants have a biological clock that is sensitive to amount of daylight relative to amount of darkness. I'm not sure how this clock works, but I've read that it uses various plant hormones. This clock (not the cold weather) is what tells plants to slow down and eventually halt photosynthesis in autumn, and send water and sugar down into the roots for storage until next spring, when the clock senses increasing daylight. The fall colors are the result of various chemicals such as carotenoids, xanthophylls, and anthocyanins. Some of these colorful chemicals co-exist with chlorophyll and become visible when the chlorophyll is broken down, whereas others are only produced in late summer and autumn.

Answer 2

Leaves always have a range of pigments (Carotenoids are always present). During the spring and summer there is an excess of chlorophyll and it overpowers or masks the other pigments. When autumn approaches the veins of the leaf start being closed off by cork cells and this starts to deplete the amount of chlorophyll. Basically more chlorophyll is being used up than is being created. Carotenoids and Anthocyanins give the leaves their autumn colors. While Carotenoids are always present and usually give off a yellow, brown, or orange color. Anthoocyanins are produced in the late summer by the breakdown of sugars and usually give off a color something like red or purple.

Answer 3

Yes Photosynthesis stops. Leaves fall off trees not because of the cold, but because of the angle of the sun.

Answer 4

Yes, in a way. If I remember right, the leaves always have the pigments in them which make them appear red/yellow. But usually there is so much chlorophyll that its green color overshadows the red/yellow pigments. In the fall, when the leaves die, the amount of chlorophyll decreases and so you can see the red/yellow pigments.

Answer 5

No,Those colors are the actual colors of the leaves with out chlorophorm in it.That happens because th tree needs to store water so it prevents the flow of that chemical to the leaves so they die and fall off.

Answer 6

It is not exactly related. The reason why leaves turn brown is because the green coloured chlorophyll disappear from each leaf.

Answer 7

I think it has more to do with the leaves dying because of the cold...but I'm really not sure

Answer 8

not really, the red anthocyanins are there all year, when the frost kills the chloroplasts, we see the red color and or yellows

Answer 9

yes