Answer:
Asexual (vegetative) reproduction
Step-by-step explanation:
Asexual reproduction is a type of reproduction that involves only a single parent. As opposed to sexual reproduction, it does not involve the formation of sex cells or gametes.
According to this question, Bryophyllum, which is a plant known to propagate itself via its leaves is practicing a form of asexual reproduction called VEGETATIVE PROPAGATION, which is the propagation of a plant via its vegetative parts e.g. stems, leaves, cuttings etc.