Structure of Tree

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Structure of Tree
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(a) Pith: The innermost central portion or core of the tree is called pith or medulla. Having different sizes from tree to tree. It mainly represents the decayed part of the wood hence does not give any strength to it. (b) Heartwood: The inner annual rings surrounding the pith is known as heartwood. It is also dark in color hence does not take an active part in the growth of the tree. But timber has strength because of this part.
(c) Sapwood: The outer annual rings between the heartwood and the cambium layer is known as sapwood. Also known as alburnum. It’s color generally light which indicates that through this layer tree take their food and nutrients from the soil. It does not give any strength to it.
(d) Cambium layer: Thin layer of sap between sapwood and the inner bark is known as the cambium layer. We can say it as the past of sapwood because by the time it gets converted into the sapwood. Hence is responsible for the future growth of the trees.
(e) Inner bark: The inner skin or layer covering the cambium layer is known as inner bark.
(f) Outer Bark: The outer skin or cover of the tree is known as outer bark.
(g) Medullary rays: The thin radial fibers extending from pith to cambium layer are known as medullary rays. Its main function is to hold the annual rings of sapwood and heartwood in position and thereby imparts strength to it.

Structure of Tree

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