Which of these can lead to polyembryony?a. Proliferation of nuclear cells in embryob. Fertilization of helper cells by sperms carried by another pollen tube in embryo sacc. Cleavage in pro embryo during embryo development

Occurrence of more than one embryo in a seed is referred to as polyembryony.Proliferation of nuclear cells in embryo, fertilization of helper cells by sperms carried by another pollen tube in embryo sac and cleavage in pro embryo during embryo development can lead to polyembryony.