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Consider the following tissues in the stelar region of a stem showing secondary growth. (A) Primary xylem (B) Secondary xylem (C) Primary phloem (D) Secondary phloem. Arrange these in the correct sequence of their position from pith towards cortex.
A
(A), (B), (D), (C)
B
(B), (A), (C), (D)
C
(A), (B), (C), (D)
D
(B), (A), (D), (C)
Detailed Solution
From the pith outward towards the cortex, the tissues are arranged as: Primary xylem (innermost, towards pith) → Secondary xylem → Secondary phloem → Primary phloem (outermost, towards cortex). So the sequence is (A), (B), (D), (C).