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 corts.

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(B), (A), (D), (C)

(A), (B), (C), (D)

(A), (B), (D), (C)

(B), (A), (C), (D)

answer is A.

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Detailed Solution

The vascular cambium ring cuts cells in both directions. On the inner side of the ring, it cuts secondary xylem and towards the outer side, it cuts secondary phloem.The primary xylem shifts to the centre. The primary phloem will be located above the secondary phloem towards the periphery, occupying the outermost position.

Hence, the correct sequence of tissues from the pith towards the cortex is: Primary xylem (A) - Secondary xylem (B) - Secondary phloem (D) - Primary phloem (C).

(2), (3) and (4) are the incorrect sequences.

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