Statement A: Secondary medullary rays may be formed from cells of primary medullary rays of dicot stem upon dedifferentiation and later redifferentiation.
Statement B: Cells of primary medullary rays present between fascicular cambia of adjacent vascular bundles of dicot stem regain meristematic activity and form interfascicular cambium which give rise ray parenchyma of secondary xylem and secondary phloem that together form vascular rays or secondary medullary rays.

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Statement A is correct and B is incorrect

Both statements A and B are correct

Both statements A and B are incorrect

Statement A is incorrect and B is correct

answer is A.

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Detailed Solution

Secondary medullary rays are formed from ray initials of vascular cambium which are also called as vascular rays. Interfascicular cambium of vascular cambium is formed from medullary ray cells present between fascicular cambia of adjacent vascular bundles.

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