7th grade biology. Leaves + color Pigemts + HELP!!!!! + Please!!!?

Question

~What factors cause leaves to change colors.
Where do these colors come from?
~What are the names of the specific chemical pigments that cause the colors we see (reds, yellows, purples, browns, greens etc.) These are the same pigments (chemical that causes color) that give fruit their different colors.
~What is the process (how it happens) that cause leaves to fall off of the branches. Explain at the cell level. (picture)

Thanks. Please try to awnser.

Answer 1

the shortening days of autumn induce dormancy, and the plant acclimitizes to get ready for winter. the green chlorophyll is degraded, and the yellow and orange carotenoids previously masked by chlorophyll become visible. the senescing cells also produce brightly colored anthocyanins, causing leaves to change color. leaf abscission occurs in the zone where there are thin-walled cells. cells along the separation zone suberize(form suberin) and isolate the leaf from the stem.

Answer 2

The colors are there all the time. They are masked in the summer by the green of the chlorophyll.
They are various pigments - Xanthophylls etc. I don't remember tehm all.