In old dicot stems,a major part of the wood i | vedclass

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(B) In older dicot stems,the secondary xylem in the central or innermost region becomes dark brown due to the deposition of organic compounds like tan

Vedclass · Accepted Answer

Heart wood

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(B) In older dicot stems,the secondary xylem in the central or innermost region becomes dark brown due to the deposition of organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils. These substances make the wood hard,durable,and resistant to the attacks of microorganisms and insects. This region is known as heartwood or duramen. It does not conduct water but provides mechanical support to the stem.

In old dicot stems,a major part of the wood is filled up with tannins,resins,gums,etc. This part of the wood is called:

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