Biology Question on morphology of flowering plants

Question

Angle of divergence in tristichous phyllotaxy is

Answer 1

Solution

The arrangement of leaf on a stem or branch is called phyllotaxy. $120?$ phyllotaxy is found in tristichous or three-ranked $1/3$ phyllotaxy.
Hence, the angular divergence is $1/3$ of $360? = 120?$ or $1/3$ phyllotaxy.