Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.
Role of Imbibition In Plants: (i) Imbibition is the first step in the absorption of water by the roots and cells, (ii) Imbibition of water by cell walls helps to keep the cells moist, and. (iii) Imbibition pressure is helpful in seed germination, growth of seedling through the soil, ascent of sap in plants, etc.