CBSE Class 10 Science 2019 · Paper 31/2/3 · Question 15

(a) In budding, fragmentation and regeneration a new individual develops from a part of a single parent, without the formation and fusion of gametes; its cells arise by mitosis, so the offspring are almost identical copies of the parent. Reproduction by a single parent without gametes is asexual reproduction. (b) Regeneration in Planaria: when the body of a Planaria is cut into a number of pieces, each piece grows into a complete Planaria. Specialised cells in each piece proliferate to form a mass of cells; these cells then change into the different cell types and tissues in an organised sequence (development) and rebuild the missing parts, such as the head or the tail (see the diagram).