Give reasons for the following:
(a) Bark of a tree impervious to gases and water.
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Answer:
Bark cells are impervious to gases and water because they contain a chemical called suberin which doesn't allow gases or water into the tree as bark cells are in the bark outer most layer of the tree they are impervious to gases and water.
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Explanation:
Cells of bark are dead and compactly arranged without intercellular spaces. They have a chemical called suberin in their walls that make them impervious to gases and water. So the bark of a tree is impervious to gases and water.
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