A) autumn wood
B) heart wood
C) sap wood
D) spring wood
Correct Answer: C
Solution :
The function of secondary xylem (water and mineral conduction from roots) is performed by outer younger rings of secondary xylem which is called sap wood or alburnum. With the passage of time and addition of new outer rings of secondary xylem more rings of the sap wood (alburnum) changc into heart wood (duramen). This is why the heart wood increases in diameter year after year but the sap wood remains almost of the same thickness.
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