NEET BIOLOGY

Detailed explanation-1: -The main function of a semi-permeable membrane in cells is to separate the cell from the environment while allowing for the controlled transport of molecules in and out of the cell.

Detailed explanation-2: -Cell Membrane (Plasma Membrane) The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.

Detailed explanation-3: -Diffusion, osmosis and facilitated diffusion are passive means to get things across the membrane. There are energy consuming means also. These would fall under the heading of active transport. The really big stuff (e.g. proteins and polysaccharides) does not get in and out of a cell by passing through the membrane.

Detailed explanation-4: -Water molecules and ions move through channel proteins.

Detailed explanation-5: -Semi-permeable membrane-A membrane through which only smaller molecules like water can pass but not the bigger molecules like solutes is known as semi-permeable membranes (SPM).