As a tree grows older,which part increases ra | vedclass

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(A) As a tree grows older,secondary growth occurs due to the activity of the vascular cambium. This process produces secondary xylem towards the inner

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Its heartwood

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(A) As a tree grows older,secondary growth occurs due to the activity of the vascular cambium. This process produces secondary xylem towards the inner side. The older,central part of the secondary xylem becomes physiologically inactive,dark,and hard due to the deposition of tannins,resins,and oils,which is known as heartwood $(duramen)$. While heartwood provides mechanical support,the sapwood $(alburnum)$ is the peripheral,physiologically active part of the secondary xylem that conducts water and minerals. In older trees,the volume of heartwood increases significantly as more sapwood is converted into heartwood over time.

As a tree grows older,which part increases rapidly in thickness?

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