This video lecture from The Cell (F.Sc. first year Biology) covers: Selectively permeable membrane i.e. allowing only selective substances to pass as outermost cell boundary in animal cell and second most in plants. Unit membrane model and Fluid Mosaic model is also discussed. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.