Growth rings (annual rings) are formed by activity of [AFMC 1984, 85, – McqOptions

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1.	Growth rings (annual rings) are formed by activity of [AFMC 1984, 85, 86, 90]
A.	Cambium
B.	Xylem
C.	Phloem
D.	Both xylem and phloem
Answer» B. Xylem

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