2006-10-09 20:15:30 · 6 answers · asked by Barbara Doll to you 7 in Science & Mathematics ➔ Botany
In autumn/fall deciduous trees absorb nutrients from their leaves (rather than wasting them when leaves drop). Along with nutrients chlorophyll is also reabsorbed, thats why the leaves loose their green colour! They look yellow because caretenoid compounds in the leaf are not reabsorbed, hence leaves look yellow/red.
I forget the scientific name for this process (of reabsorbion) but believe its something along the lines of senesence?!?
2006-10-09 21:10:30 · answer #1 · answered by magooio 1 · 0⤊ 0⤋
In winters the leaves become pale or yellow due to destruction of Chlorophyll molecules. Actually this process is known as the senescense.
At the time of onset of winters plants especially yhe deciduous palnts develop A plant hormone known as abcissic acid in their cells this abcissic acid pomotes and triggers leaf and fruit fall it also brings about the destruction of chlorophyll. It can also be experimentally verified by application of Abcissic acid as spray.
2006-10-10 09:32:15 · answer #2 · answered by deekay s 2 · 0⤊ 0⤋
In decidious plants and trees, they do not contain any chlorophyll in the winter, they use every hour of daylight from spring to fall, to make an excesss of sugars and store them as polysaccarides.
2006-10-10 03:19:28 · answer #3 · answered by davidalanjones1990 2 · 0⤊ 0⤋
Florida
2006-10-10 09:26:30 · answer #4 · answered by Anonymous · 0⤊ 0⤋
South Beach ?
However, the previous answers are more scientifically correct.
2006-10-10 03:24:46 · answer #5 · answered by JR 2 · 0⤊ 0⤋
its fallen with the autumn. in the autumn the leaves fall so does the chorophil
2006-10-10 03:19:51 · answer #6 · answered by richi rasyid 4 · 0⤊ 0⤋