Co-transport is a type of transport when carrier proteins allow the transport of two molecules to move combinedly. It is of two types i.e., symport and antiport. When two types of molecules move across the cell membrane by the carrier protein in the same direction then it is called symport.

Co-transport is a type of transport when carrier proteins facilitate the transport of two molecules to move combinedly. It is of two types i.e., symport and antiport. When two types of molecules move in opposite direction across the membrane, it is called antiport. It is passive transport.

Co-transport is a type of transport when carrier proteins allow transport of two molecules to move together. When a molecule moves across a cell membrane independently i.e., free from outside control of another molecule then it is called uniport.

Germinating seeds absorb water and activate the protoplasmic materials including enzymes. This mechanism is an example of imbibition. The process by which the hydrophilic colloid swells when brought in contact with water is known as imbibition.

The process of selective transmission of a solvent in preference to a solute that takes place through a semipermeable membrane when two solutions of different concentrations are separated by it is called osmosis. It is classified into two types i.e., exosmosis and endosmosis. Endosmosis is the movement of the water inside the cells when the cell is placed in a hypotonic solution.