Why do leaves on many trees change from green to bright red,
yellow or orange?
p the spring and early summer leaves of a tree grow faster.
ise water and other chemicals flow to them. In the
early autumn, the water and chemicals go back into the tree.
e echemicals is chlorophyll. It is the green matter that
edS to change sunlight, water and CO2 into food
llorophyll flows back into the tree, bright reds,
mges that are also in the leaves appear. These
in the leaves, but they could not be seen
S much more green chlorophyll.
me, a special group of cells at the bottom of the
become weak. This is why the leaves break of
or heavy rain. The aging and death of leaves is
Ving water and growth chemicals from year to year.
wfalls and dry summer weather happen, ① autumn
Elas beautiful as they usually do. Trees do not
chemical steps to produce bright colors. Their
nm and fall off quickly ②⑦to save [ as, as water
(②73 os)
