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  4. The condition where protoxylem lies towards the pith and metaxylem towards periphery is called as (i) while the condition where protoxylem lies towards periphery and metaxylem towards pith is known as (ii)

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Q. The condition where protoxylem lies towards the pith and metaxylem towards periphery is called as (i) while the condition where protoxylem lies towards periphery and metaxylem towards pith is known as (ii)

NTA AbhyasNTA Abhyas 2020Anatomy of Flowering Plants

Solution:

The primary xylem tissue is of two types : protoxylem and metaxylem. The protoxylem is formed first and the metaxylem is formed later. The primary xylem is called endarch when the protoxylem lies towards the centre(pith) and metaxylem lies towards the periphery. E.g in stem. When the protoxylem lies towards periphery and metaxylem towards the centre it is called exarch xylem, eg : in roots.