Why do Trees Have the Bark?

What does bark do for the three? One its main functions is to protect the inner. More delicate structures. It not only keep them from drying out, but also guards against outside injuries of various sort.

The thick, fibrous bark of some redwood  trees in America show scars as a result of fires near the ground, but the inner portions of the tree escaped injury. The process by which bark is formed may go on year after year. In the very young branch of a maple, for examples there is no rough bark as such. The surface of the shoot is nearly smooth.

As the twig forms more wood and grows in size, the outer portions may split open. The injury caused in this way is healed from the inside.

Some of the outer portions becomes dry and die. The dead, broken portions give the bark a rought appearance. Some of the dry pieces ar sheed or broken off as the twig grow larger and older. Man find the bark of many trees very useful. Commercial cork is obtained almost enterely from the cork oak tree.

The bark of the hemlock tree is used in the tanning of leather. The spice we know as cinnamon is the powdered bark of a tree which grows in India and Malaya. Quinine is obtained  from the bark of the chincona tree. Extracts from the bark of other trees are used for flavoring, and the bark of the roots and branches of many trees are used in medicines.

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