Why are branches of old trees different than the stems of a new plant?
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The upper part of the tree with the branches is called the crown. Needles or leaves are the part of the tree that make sugar from air and water. The outer layer of stems is not that hard compared to bark and it's made up of living cells.
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Outer layer of the trees is covered with bark, which gives it strength and protect the plant from injury and infection. The bark is made up of dead cells of different origins. While the outer layer of young tree stem is made up of living cells.
The upper part of the tree with the branches is called the crown. Needles or leaves are the part of the tree that make sugar from air and water. The outer layer of stems is not that hard compared to bark and it's made up of living cells.
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