Home Biology Anatomy of Flowering Plants Skill Builder In roots, the primary xylem is called exarch…
Biology Anatomy of Flowering Plants Skill Builder Single Correct MCQ
Published on: August 11, 2026

In roots, the primary xylem is called exarch because:

A
The protoxylem lies towards the centre and metaxylem lies towards the periphery
B
The protoxylem lies towards the periphery and metaxylem lies towards the centre
C
Both the protoxylem and the metaxylem lies towards the centre
D
The protoxylem is surrounded by the metaxylem

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In stems, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called endarch. In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called exarch.

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