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6.Anatomy of Flowering Plants
medium
Wood is
A
Primary phloem
B
Primary xylem
C
Secondary xylem
D
Secondary phloem
Solution
The secondary xylem or wood is distinguishable as spring wood and autumn wood by presence of annual rings. Later on, due to excessive growth, it termed as heartwood and sap wood. Wood is superior to any metal in its availability, cheapness, toughness, strength and elasticity.
Standard 11
Biology
