Choose the correct statement regarding dicot stem. (A) Dumb-bell-shaped stomata, medullary rays ...

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Choose the correct statement regarding dicot stem.
(A) Dumb-bell-shaped stomata, medullary rays absent, little increase in diameter
(B) Secondary growth takes place, ground tissue differentiated, conjoint and open vascular bundle
(C) Guard cell dumb-bell-shaped, no secondary growth, ground tissue undifferentiated
(D) Medullary rays absent, xylem vessels are polygonal
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