A worm X found in freshwater and slow -moving streams has been accidentally 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 full 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?

Answer

(a) Planaria (Flatworm ) (b) Hydra (c) Regeneration (d) Simple multicellular organisms (e) No; Because dog is a complex multicellular organism