Organosilicon compounds having no carbon analogues or or having biological inert analogues.
I want to know what are mean by carbon analogues and biological inert analogues.

Organosilicon compounds are usually absent in biochemical processes. The non carbon analogue, I think.

I do not understand from your question if organosilcons are analogous, or not analogous in the biologically inert area. Clarify this.

Somehow I just want to know what is mean by
Carbon analoguesand biological inert
Analogue.

An organosilicon compound contains the atoms silicon and carbon. A carbon analogue would be essentially the same compound with carbon atoms replacing the silicon atoms. An analogue in chemistry refers to two separate compounds that are structurally similar but have different atoms, functional groups or subgroups.
Examples:
Methan vs Silane
Methanol vs Silanol

Biologically inert refers to compounds that do not create a response or interact when introduced into a biological tissues.