Question

Exine should be hard why and what is the function of germ pore?

Answer 1

Exine should be hard, because it protects pollen grains under adverse conditions.

Through germ pores, pollen tube comes out from pollen grain upon deposition on stigma of flower.

Hope it helps

Answer 2

it protects pollen grains at adverse condition, through germ pores it disposition stigma if flower