Radicle dies quickly after emission (some monthes) and is replaced by adventitious roots coming out from the base of the stem (example: Monocot plants).

All roots are coming from the vertical growth and branching of the radicle (first root coming out from the seed) which persists during all the plant life (example: Dicot plants).

The primary tap root is limited in growth (it can die) and is replaced by additionnal secondary tap roots.

The primary tap root is limited in growth (it can die) and is dominated by plagiotropic laterals.