Regeneration : It is the ability of an organism to give rise to a new organism/ individual from their body parts.
Regeneration in Hydra :
(i) The body of Hydra when cut into number of pieces forms regenerative cells.
(ii) Each contains specialised cells.
(iii)These cells proliferate and make large number of cells.
(iv) From this mass of cells different cells undergo changes to form various cell types and tissue which finally develops into a new organism.
