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 ability of organisms to give rise to a new organism or individual from their body parts.
If the body of hydra is cut into pieces, then each body piece of Hydra can grow into a complete Hydra i.e. on cutting into pieces, the cells of the cut parts divide rapidly to make a 'ball of cells'. The cells present in the 'ball of cells' move to their proper places within the ball where they have to form various organs and body parts of the organisms.