Why are budding, fragmentation and regeneration all 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 type of reproduction because all of them involve only one parent and gamete are not involved in reproduction.
Regeneration in Planaria It can be cut into any number of pieces and each piece grows into a complete organism. This known as regeneration (see fig.) Regeneration is carried out by specialised cells, These cells proliferate and make large number of cells. From this mass of cells, different cells undergo changes to become various cell types and tissues. These changes take place in an organised sequence referred to as development.