Question

the outer wall of pollen grain is called?​

Answer 1

Exine which is made up of sporopollinin( which is one of the most resistant organic substance on earth).

Answer 2

The outer wall of pollen grain is called Exine.

• Exine is made up of sporopollenin.
• Exine is formed by tapetum.
• Exine is sporophytic in origin.
• Exine is discontinuous because of germ spore.