Select the incorrect statement'
(a) Plants undergoing non-recurrent agamo-spermy generally produce non-viable seeds.
(b) In recurrent agamospermy all the cells of embryo sac are diploid as it is directly formed from nucellar or megaspore mother cell.
(c) In gymnosperms, polyembryony may occur due to cleavage of growing embryo.
(d) Polyembryony never occurs in mango and groundnut.
