Question

define regeneration as used in relation to reproduction

Answer 1

Regeneration is the ability of organisms to generate lost or damaged body parts.

Many fully differentiated organisms show the ability of regeneration.

If planaria is cut into small pieces, then each piece develops into a new planaria.

Regeneration is carried out by specialised cells.

These cells form a mass of cells which undergo changes to form cells specialised in different functions.

In hydra, if the body is cut into half, the lower part will develop head while the upper part will develop a new foot.

If its cells are separated and aggregated back, hydra will reform its structure.

Answer 2

Regeneration is defined as the process of growing a full organism from its body part.

for eg Hydra and Planaria

When the body of the hydra is cut into various pieces, then each piece has tendency to regenerate and form a complete hydra.  

2. When the body is cut into pieces, the cells of cut pieces divides and make a ball of cells which then forms tissue and again regenerate the missing body part.

thnx