Growth that results in an increase in the length of a plant is referred to as:

A) horizontal growth.
B) longitudinal growth.
C) primary growth.
D) radial growth.
E) secondary growth.

Primary Growth

An increase in the length of a plant that occurs at the tips of the shoots and roots due to the activity of apical meristems. Compare with secondary growth.

Horizontal Growth

Increase in size or spread of an organism or structure by expanding outwards, rather than elongating.

Longitudinal Growth

The growth of an organism in length, typically observed in the elongation of bones and roots.