Question

explain the term exarch and endarch condition of xylem

Answer 1

It is decided on the basis of position of protoxylem... If proto xylem is outside then this condition is exarch and if inside then endarch

Answer 2

protoxylem in middle
metaxylem at periphery
in roots,
exarch condition.
protoxylem at periphery
metaxylem in center
in stems,
endarch condition.