In most monocotyledonous roots, the origin of lateral roots can be traced to the region of vascular bundles that lies:

Correct option is A

Correct Answer: (a)
Explanation:
In monocot roots, lateral roots originate endogenously from the pericycle, specifically opposite to protoxylem poles of vascular bundles.
Information Booster:
Lateral roots in both monocots and dicots are endogenous in origin (from internal tissues).
Pericycle lies just inside the endodermis.
This origin ensures continuity of vascular connection between parent and lateral roots.
Protoxylem = first formed xylem at the periphery of vascular cylinder.
This arrangement aids in efficient transport continuity.
Additional Information (Incorrect Options):
(b) Protophloem position differs; lateral roots arise near protoxylem, not protophloem.
(c) Endodermis surrounds pericycle but does not initiate roots.
(d) “Between protoxylem and protophloem” is an imprecise anatomical description.