The plasma membrane surrounds the cell. Chemically plasma membrane is composed of: (a) Protein: 60 to 80% (b) Phospholipids: 20 to 40% (e) Cholesterol in small amount (d) Carbohydiutes in small amount Different models were put forward about the physiochemical nature of plasma membrane.
What is diffusion? Give factors affecting the rate of diffusion. What is imbibition? Give its significance? What is osmosis? Give its demonstration. Give factors affecting osmosis. Describe water relations. What is soil? Give its texture and profile. Write note on soil water. Give factors
The movement of solvent molecules from the region of higher concentration to the region of lower concentration through semi permeable membrane is called osmosis. Demonstration A thistle funnel is filled with a concentrated solution of sucrose. Its mouth is closed with a rubber membrane.