Turgidity: A cell in its fully expanded condition is said to be turgid. Thus, turgidity is the stale of a cell in which the cell wall is fully expanded due to absorption of water (endosmosis) up to the last limit. The water pressure inside plant cells is called turgor pressure, and it is maintained by a process called osmosis.
Importance of turgidity:
(i) Closing and opening of Stomata is regulated by the turgidity of guard cells
(ii) Growth of cells: Cells enlarge in plume due to turgidity
(iii) Dispersion of seeds or spores: Many fruits and sporangia swell up and split off by absorbing water and eventually seeds and spores dispersed
(iv) Giving mechanical support: Moat of the aquatic plants get rigidity only by turgidity
(v) Germination: Due to turgidity the embryo gets more rigidity and comes out of the seed coat diming germination.
(vi) It helps in the movement of nutrient solutions from cell to cell. This is because of the difference in the concentration of the cell sap between one cell and the other.
(vii) It is necessary for the growth of different organs.
Turgidity is very important for plants. It helps in maintenance the plant rigid and upright. It also results in replete of a cell. It saves the plants from wilting.