CBSE Class 10 Answered

Fragmentation

Regeneration

• Occurs in multi-cellular organisms with relatively simple body organisation.

• Occurs in several fully differentiated organisms.

• Organisms simply break up into smaller pieces upon maturation. These pieces or fragments grow into new individuals.

• If the individual is accidently cut or broken up into many pieces, many of these pieces grow into separate individuals. 

• Fragmentation results in the production of identical offspring.

• In regeneration, the entire organism can regenerate as in certain animals like Planaria, but mostly the organism regenerates only a part of the body.

• No specialised cells are involved in fragmentation.

• Regeneration is carried out by specialised cells. These cells proliferate and make large numbers of cells. From this mass of cells, different cells undergo changes to become various cell types and tissues.

• Example: Spirogyra

• Example: Crabs can regenerate legs. Mammals can regenerate liver cells and blood cells.

         Lizards can regenerate their tail