Arrange the following in ascending order with reference to the size of the medulla.
A) Dicot root B) Monocot stem
C) Dicot stem D) Monocot root

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B D A C

B A D C

D B A C

A B C D

answer is A.

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Detailed Solution

All tissues inside the endodermis such as pericycle, vascular bundles and pith/medulla constitute the stele.

Dicot root -pith is inconspicuous.
Monocot root -pith is large and well developed.
Dicot stem : Numerous rounded, parenchymatous cells with large intercellular spaces which occupy the central portion of the stem constitute the pith.
Monocot stem : Pith is absent, and the vascular bundles are scattered throughout the ground tissue.

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