A worm X found in freshwater and slow-moving streams has been accidently cut into three pieces. It was observed that in due course of time, each cut piece of the worm develops to become a complete worm by growing all the missing parts.
(a) Name the worm X which can exhibit this phenomenon of making complete worm from its cut body parts.
(b) Name another organism Y which possesses the same characteristic of growing fully from its cut body parts.
(c) What is the name of this process in which a complete organism is formed from its cut body part.
(d) State whether X and Y are unicellular and/or multicellular organisms.
(e) Can a dog be produced completely from its cut body part (say, a cut tail) just like organisms X and Y ? Why?
(a) Worm (X) is planaria.
(b) Organism (Y) is hydra.
(c) Regeneration is the process in which a complete organism is formed from its cut body part.
(d) X and Y are simple multicellular organisms.
(e) No, dog cannot be produced completely from its cut body part because dog is a complex multicellular organism.