NEET2005BotanyReproduction in OrganismsActual
Based on cellular mechanisms there are two major types of regeneration found in the animals. Which one of the following is the correct example of the type mentioned?
Options
- AMorphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras
- BEpimorphosis - Replacement of old and dead erythrocytes by the new ones
- CMorphallaxis - Healing up of a wound in the skin
- DEpimorphosis - Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians
Correct answer
A. Morphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras
Step-by-step solution
Based on cellular mechanisms, regeneration can be divided into two broad categories : morphallaxis and epimorphosis. Morphallaxis refers to the type of regeneration in which lost body parts are replaced by the remodelling of the remaining tissue. In this type of regeneration, little or no cellular proliferation takes place during the regeneration process. A classic example of an organism that regenerates using this mechanism is the Hydra. When a Hydra is cut into two pieces, two Hydra will be regenerated, both smal