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Central part of the wood is always dark ...

Central part of the wood is always dark . Why ?

Text Solution

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(i) The centre part of the wood, which is darker in colour is called heart wood or duramen.
(ii) The sap wood conducts water while the heart wood stops conducting water.
(iii) As vessels of the heart wood are blocked by tyloses, water is not conducted through them.
(iv) Due to the presence of tyloses and their contents the hearwood becomes coloured. dead and the hardest part of the wood.
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