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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?

  1. A
    Morphallaxis — Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras.
  2. B
    Epimorphosis — Replacement of old and dead erythrocytes by the new ones.
  3. C
    Morphallaxis — Healing up of a wound in the skin.
  4. D
    Epimorphosis — Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians.

Solution & Step-by-step Explanation

Regeneration is divided into morphallaxis and epimorphosis. Morphallaxis involves the remodeling of existing body tissues into a new organism without significant cellular proliferation, as seen when a Hydra is cut into pieces and each piece develops into a smaller Hydra. Epimorphosis, seen in Planaria or salamander limb regeneration, requires active cellular proliferation and the formation of a blastema. Option (a) correctly identifies the mechanism for Hydra.
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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?
A
Morphallaxis — Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras.
B
Epimorphosis — Replacement of old and dead erythrocytes by the new ones.
C
Morphallaxis — Healing up of a wound in the skin.
D
Epimorphosis — Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians.

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