Question

what is significance of pores present on nuclear membrane?

Answer 1

Pores present on nuclear membranes are known as nuclear pores
These nuclear pores are the passages through which movement of RNA and protien molecules takes place in both the direction between the nucleus and cytoplasm
in short we can say that it is the main channel between nucleoplasm and cytoplasm
The size of nuclear pores is 300 to 1000 A in diameter each nuclear pore is guarded by a octagonal discoid structure if nucleoplasm in protein this structure is called annulus or bleb

Answer 2

The nuclear membrane has pores in its surface to allow nuclear exchange of a material from and back to its surroundings. These pores are present in thousands and are found 40 nm in diameter. They also link the inner and outer membrane of the membranes of the nucleus.