In old trees,the greater part of secondary xy | vedclass

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(B) In old trees,the greater part of secondary xylem is dark brown due to the deposition of organic compounds like tannins,resins,oils,gums,aromatic s

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Deposition of organic material

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(B) In old trees,the greater part of secondary xylem is dark brown due to the deposition of organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils in the central or innermost layers of the stem.These substances make the wood hard,durable,and resistant to the attacks of microorganisms and insects.This region comprises dead elements with highly lignified walls and is called heartwood.

In old trees,the greater part of secondary xylem is dark brown due to the

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