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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) In winter season the cambium is less active and forms fewer xylary elements that have narrow vessels/ tracheids and this is called Autumn wood or late wood .
(ii) They are thick walled. Autumn wood is darker in colour and has a higher density. This is covered by spring wood.
(iii) Thus the centre part of wood is always dark .
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