Question

name the two cells present inside a typical pollen grain how these cells differ from each other with explain

Answer 1

The grey matter mainly consists of neuronal cell bodies and unmyelinated axons. The grey matter contains the glial cells (astroglia and oligodendrocytes ) . All the glial cells apart from microglial cells ,i.e, astrocytes, oligodendrocytes or glioblasts , are macroglial cells. 
Microglia have mesodermal origin. They have branched cytoplasmic processes and they function as  macrophages of the CNS and thus play the phagocytic role.
On the other hand, macroglial cells have ectodermal (neural) origin. These cells acts as supporting cells within the central nervous system and help in recovery during inflammation or injury. Glioblasts are actually the stem cells which can differentiate further into macroglial cells.

Answer 2

The two cells present inside a pollen grain are 'vegetative cell' and 'generative cell'. Each cell has a different function.

Explanation:

Pollen is a fine powdery substance inside a plant which contains the pollen grains. Pollen grains are also known as male gametes which fuse with the female gametophyte in the ovule.

But to transfer these pollen grains into pistil of the plant we need a pollen tube. This pollen tube is generated by the vegetative cell while the generative cell divides into two sperm cells.