No secondary growth appears in monocot roots, because

They have single cotyledon per seed.

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They possess adventitious roots.

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They lack cambium.

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Vascular bundles are closed.

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Solution

The correct option is A They lack cambium.
Secondary growth does not occur in a monocot plant because of the absence of cambium in a vascular bundle in between xylem and phloem.
But in monocots like Dracaena Secondary growth is seen. Only in some exceptional cases but it is rare
Hence, No secondary growth appears in monocot roots, because They lack cambium.
So, the correct answer is 'They lack cambium.'.

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Similar questions

Secondary growth does not occur in monocots as their vascular bundles are -

	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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