Define the following terms:
$(i)$ Endarch xylem
$(ii)$ Exarch xylem
$(i)$ Endarch xylem
$(ii)$ Exarch xylem
(N/A) $(i)$ Endarch xylem: In this type of development,the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ. This is a characteristic feature of stems in angiosperms.
$(ii)$ Exarch xylem: In this type of development,the protoxylem lies towards the periphery and the metaxylem lies towards the centre. This is a characteristic feature of roots in angiosperms.
$(ii)$ Exarch xylem: In this type of development,the protoxylem lies towards the periphery and the metaxylem lies towards the centre. This is a characteristic feature of roots in angiosperms.
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