In (i), protoxylem lies towards periphery and metaxylem lies towards centre. Such an arrangement of primary xylem is called as (ii)

Options

A. `{:("Column I","Column II"),("stems","endarch"):}`
B. `{:("Column I","Column II"),("stems","exarch"):}`
C. `{:("Column I","Column II"),("roots","endarch"):}`
D. `{:("Column I","Column II"),("roots","exarch"):}`

Answer

D

Explanation

In exarch condition of xylem, protxylem or the first formed xylem is present towards the periphery while metaxylem or later formed xylem is present towards the centre of the root such an arrangement can be seen in roots.