Question

Why parthenogenesis is considered as asexual reproduction?

Answer 1

Parthenogenesis is an asexual mode of reproduction, in which, an unfertilized egg develops into a new individual, occurring commonly among insects and certain other arthropods. 
form of asexual reproduction found in females, where growth and development of embryos occurs without fertilization by a male. In plants, parthenogenesis means development of an embryo from an unfertilized egg cell, and is a component process of apomixis. The offspring produced by parthenogenesis are always female in species that use the XY sex-determination system, and male in those that use the ZW sex-determination system. 

Parthenogenesis occurs naturally in some invertebrate animal species (e.g. water fleas, aphids, nematodes, some bees, some Phasmida, some scorpion species, and parasitic wasps), and vertebrates (e.g. some reptiles, fish, and very rarely birds and sharks and this type of reproduction has been induced artificially in other species.)
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Answer 2

Parthenogenesis is a type of asexual reproduction in which the organism is developed from unfertilized egg. This process may be natural as well as artificial.