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) A worm X which exhibits the phenomenon of developing into complete worm from its cut body parts is Planaria (through the process of regeneration).

(b)  The another organism Y that possesses the same characteristics of growing fully from its cut body parts (through the process of regeneration) is Hydra.

(c) The process in which a complete organism is formed from its cut body part is known as regeneration.

(d) Organism X and Y (Planaria and Hydra) are unicellular organisms.

(e) No.

A dog cannot be produced completely from its cut body part such as tail because multicellular organisms show limited regeneration capacity due to specialized functions of the tissue.

These specialized tissues form the organ and organ system.

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Updated on: 23-Mar-2023

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