2006-11-14 10:06:50 · 4 answers · asked by Jia 1 in Science & Mathematics ➔ Botany
Reduction in light and in some cases lower temps for some trees kill the chlorophyll. This lets the other pigments(reds and yellows) show through that have always been there but were hidden by the abundant chlorophyll.
2006-11-14 11:27:39 · answer #1 · answered by biobabe222 2 · 0⤊ 0⤋
As leaves grow their ability to photosynthesize increase for a time and then often even before maturity, begins slowly to decrease. Old leaves become yellow & are unable to photosynthesize due to breakdown of chlorophyll. Also production of certain hormones like gibberillin. Remember its chlorophyll pigment that makes plant appear green.
2006-11-15 03:26:06 · answer #2 · answered by ceegkhan 2 · 0⤊ 0⤋
Look up deciduous in the dictionary.
2006-11-14 18:14:16 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Is this a homework question?
2006-11-14 18:08:47 · answer #4 · answered by shermynewstart 7 · 0⤊ 0⤋