A) primary phloem
B) primary xylem
C) secondary xylem
D) secondary phloem
Correct Answer: C
Solution :
The secondary xylem or wood is distinguishable as spring wood and autumn wood by the presence of annual rings. Later on due to excessive growth, it termed as heart wood and sap wood. Wood is superior to any metal in its availability, cheapness, toughness, strength and elasticity.
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