Question

what is plasma memberane mention its composition and function in brief

Answer 1

The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embeddedproteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.

Answer 2

Cell membrane Or Plasma Membrane is the outermost part of an animal cell and second last in Plant cell.
Plasma membrane is semi permeable that means it allows only certain selective materials to pass through. It protects the cell from its surrounding conditions.