Question

the exine of pollen grain is made up of

Answer 1

sporopollinin .the polengrain exine made by this

Answer 2

Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell. In flowering plants the vegetative tube cell produces the pollen tube, and the generative cell divides to form the two sperm cells.