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As secondary growth proceeds, in a dicot...

As secondary growth proceeds, in a dicot stem, the thickness of

A

heartwood increases

B

sapwood increases

C

both increase

D

both remain the same

Text Solution

Verified by Experts

The correct Answer is:
a
As a result of continous secondary growth in subsequent year , the older part of secondary xylem becomes non - functional . Due to this activities of vessels become blocked by bladder like ingrowths which are clled tyloses . Due to this non - functional xylem becomes hard and blackish in in colour called duramen or heartwood.
Now , the function of secondary xylem is continoued by younger rings called sapwood or alburnum with the passage of time and addition of new outer rings of secondary xylem more ringd of sawood changes into heartwood . this is why the heartwood increases in diameter year after year but the sapwood remains almost in the same thickness.
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