The hard outer layer of pollen grains called exine is made up of:

Exine of pollen grain

Exine of pollen grain

The outer layer of pollen is made up of :

The outer layer of pollen is made up of :

The outer wall of the pollen grain is called ……….

A double layered wall of pollen grain is called *

The hard outer layer of pollen is composed of Exine Intine Integument Sporopollenin

The outer layer of pollen grain is thick and made up of complex ,nonbiodegradable substance called as………………….

Exine in pollen grain in made up of