The word Polar implies things which are at the opposite ends of an axis. The North Pole and the South Pole are at the opposite ends of an Axis drawn through the center of the Earth. We could have East and West Poles if we wanted them. However, these would be harder to define.
Most plants are polar.
We can also visualize the Shoot tip and the Shoot base as opposite ends of the shoot axis . The same applies to roots, and other organs which are polar. However, the gametophytes of Anthoceros have orbicular growth and it is harder to see their polarity. Macroalgae typically have polar growth . However, Volvox which is spherical is apolar.