Pith is not well developed in

Monocot stem

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Monocot root

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Dicot stem

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Dicot root

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Solution

The correct option is D Dicot root
Pith or medulla, is a tissue in the stems of vascular plants. Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. In dicots, pith is located in the centre of the stem. In monocots, it extends also into flowering stems and roots. The pith is encircled by a ring of xylem. The xylem, in turn, is encircled by a ring of phloem. The monocot root has a pith, whereas the dicot root does not. Absence of pith is the diagnostic feature of dicot root. Pith is present in dicot stem, monocot stem, monocot root and dicot stem.
Thus, the correct answer is option D.

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Similar questions

	Characters	Monocot root	Dicot root
(i)	Vascular bundle	Polyarch i.e., more than $6$ vascular bundles	Diarch to hexarch i.e., $2 - 6$ vascular bundles
(ii)	Cambium	Absent	Present, so secondary growth occurs
(iii)	Pith	Poorly developed	Well developed large pith
(iv)	Activity of pericycle	Gives rise to secondary roots and cork cambium	Gives rise to lateral roots only

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