Why budding, fragmentation and regeneration all are considered as asexual types of reproduction? With neat diagrams explain the process of regeneration in Planaria.

Explanation

Budding, fragmentation and regeneration are considered as asexual types of reproduction because none of them includes gamete formation and fertilization. All of these give rise to offspring from single parent only.

Regeneration in Planaria: It exhibits regeneration i.e. ability to grow the broken body part again. If the body of Planaria is cut into any number of pieces, each piece grows into a complete organism i.e. reproduction through regeneration.
Regeneration is carried out by specialized cells which proliferate and produce large numbers of daughter cells. Different cells from the group of daughter cells then differentiate into various cell types and tissues.