A) autumn wood
B) heart wood
C) sap wood
D) spring wood
Correct Answer: C
Solution :
Alburnum is also called sap-wood. It represents the outward wood of the plant. It is light in colour and lighter in weight. It represents the functional part of the secondary xylem (wood). Tracheids and vessels are not plugged by tyloses. Tannis, resins, gummy substances are not deposited in tracheary elements. This is economically not important because of being easily attacked by pathogens and insects.
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