When formation of metaxylem is in a centripetal manner, the xylem is
A
Endarch
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B
Exarch
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C
Mesarch
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D
Radial
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Solution
The correct option is A Exarch
When the xylem develops from the outside inwards towards the center, i.e., centripetally, it is called an exarch. Mainly in roots, the protoxylem lies towards the periphery and the metaxylem lies towards the centre.
When the xylem develops from the inside outwards towards the periphery, i.e., centrifugally, it is called endarch.