Older central secondary xylem and younger outer secondary xylem are respectively known as

Alburnum and duramen

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Duramen and laburnum

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Heart wood and sap wood

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Both B and C

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Solution

The correct option is C Heart wood and sap wood
(A) Alburnum is the light-colored outer part of the wood that performs the conduction of sap. It is also like sapwood.
(B) Duramen is the dark-colored central part of the wood that is unable to perform the conduction of sap. It is also called heartwood.

So the correct option is 'Alburnum and duramen'.

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