A) Morphollaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydra
B) Epimorphosis ? Replacement of old and dead erythrocytes by the new ones
C) Morphollaxis ? Healing up of a wound in the skin
D) Epimorphosis ? Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarian
Correct Answer: A
Solution :
Regeneration is the phenomenon of restoration of body parts which have been removed either by injury or autotomy. It is extensively found in planarians and common feature in polychaetes, crustaceans and echinoderms. Morgan (1901) distinguished the following two basic types of regeneration: Morphallactic regeneration or morphollaxis: In morphollaxis type of regeneration new individual is produced not by addition of parts to the residue of the animals body but by remodelling the entire available mass of cells into a new one. It is found in lower animals. Epimorphic regeneration or epimorphosis: It is common type of renege ration found in higher animals. The regenerated organ is an addition to the other parts of the animals body, e.g., Renewal of limbs in salamander. Replacement of broken tail in lizard.
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