CBSE Class 10 Science 2022 · Paper 31/1/2 · Question 5

(a) The process is regeneration (shown here in Planaria). Regeneration is the ability of a fully differentiated organism to give rise to new individual organisms from its body parts: if the organism is cut or broken up into many pieces, many of the pieces grow into separate, complete organisms. In the figure, one Planaria cut into three pieces gives three complete Planaria. (b) Specialised cells. They proliferate to make a large mass of cells, and different cells of this mass then change into the various cell types and tissues of the new organism.