See also...


Authorizations, license

Visible by: Everyone
All rights reserved

18 visits

Fall Leaf

Fall Leaf
Tempelhof, Berlin
Photo license: MMXVII © Photography & Digital Imagery

Comments
Demetrius Chryssikos
Demetrius Chryssikos
Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on, during a few weeks in the autumn season, various shades of red, yellow, purple, black, orange, pink, magenta, blue and brown.
The phenomenon is commonly called autumn colours or autumn foliage in British English and fall colors, fall foliage or simply foliage in American English.
A green leaf is green because of the presence of a pigment known as chlorophyll, which is inside an organelle called a chloroplast. When they are abundant in the leaf's cells, as they are during the growing season, the chlorophyll's green color dominates and masks out the colors of any other pigments that may be present in the leaf. Thus, the leaves of summer are characteristically green.
Chlorophyll has a vital function: it captures solar rays and uses the resulting energy in the manufacture of the plant's food — simple sugars which are produced from water and carbon dioxide. These sugars are the basis of the plant's nourishment — the sole source of the carbohydrates needed for growth and development. In their food-manufacturing process, the chlorophylls break down, thus are being continually "used up". During the growing season, however, the plant replenishes the chlorophyll so that the supply remains high and the leaves stay green.
2 weeks ago.