Question

explain the term regeneration as used in relation to Reproduction of organisms describe briefly how regeneration is carried out in multicellular organisms like hydra

Answer 1

Regeneration is the process of regrowth of a certain body parts which either gets detached or is detached by the organism(basically for self protection).

In Hydra regeneration of tentacles can be observed.

Answer 2

Regeneration is the type of asexual reproduction. It is the growth of an organism from a part of the body. It is a power or ability of a living organism to re-grow the part of the body that gets broken off or cut.When it has involvement with asexual reproduction, then the broken part regenerate into new individual of the same type. 

Hydra exhibits Morphallaxis  type of regeneration.

In this type of regeneration the lost part is replaced by the change in the tissues present in the lost part and each injured part forms a complete organism.