Question

What is fluid mosaic model.

Answer 1

The fluid mosaic model explains various observations regarding the structure of functional cell membranes. According to this model, there is a lipid bilayer in which the protein molecules are embedded. The lipid bilayer gives fluidity and elasticity to the membrane. 

Answer 2

this is the model given by singer and Nicolson to define the structure of plasma membrane
it is also known as " protein iceberg floating in the sea of phospholipid "
it means plasma membrane is made up of lipid bilayer( hydrophobic) and protein( hydrophilic) present on it.
it explains the selectively permeability of membrane