Endarch and exarch are the terms often used for describing the position of primary xylem in the plant body.

Primary xylem is of two types protoxylem and metaxylem. On the basis of relative position of protoxylem and metaxylem in the organ the arrangement of primary xylem can be endarch or exarch.

Exarch type of primary xylem is seen in roots. Therefore, Statement $I$ is false and Statement $I I$ is true.