2.4英語(yǔ)學(xué)習(xí)

The Anatomy of a Tree

The Oak Tree, with its large canopy top and

a straight upward-growing trunk, is known for the king of the western tress.

Oaks loses their leaves seasonally ,which means they bloom and wither according

to the season.

New leaves and branches sprout from sturdy

old branches when spring comes , and that remarks the start of the cycle:

growing. Chlorophyll absorbs to dioxide and sunlight , and then it is converted

to sugar by Photosynthesis. The sugar is the oak’s own energy sources , which

supports the oak’s grow by passing all parts of its body. The deep, broad root

system serves as a plumber , which absorbs water and minerals in the soil. After

the absorption , it is then transported by xylem to the leaves, where the

photosynthesis needs it as a crucial input.

Oaks produce bothe female flower and maleflowersThe acorns usually takes one totwo years to mature , from the tiny seeds into Mr. Potato-head wearing andfinally drop to the ground. During which time , it will develop in thoselow-profile female flowers.

Sunlight is stronger in summer than in any other

seasons , thus the tree can grow rapidly in hot tempretures. The tree grows higher

,its branch grows thicker ,leaves becomes greener and gradually cover the top.

The leaves will stop chlorophyll making inautumn . Though the tree loses its green ,it puts on more red, orange andbronze because of the arytenoids .Whenwinter comes, all of the leaves fall from the tree and its branch become bareagain, waiting to revive in the next spring. Oaks can live through some 600such annual cycles.

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