The correct option is D 63
Meiotic division in female plants forms three cells, of which one forms the egg cell and the remaining 3 degenerates to provide nutrition to the developing egg cell. So, 50 meiotic divisions will give 50 egg cells. And in the male gametophyte 52 gametes can be produced in 13 meiotic divisions. So, the total number of meiotic divisions required to form 50 zygotes = 63. Each zygote will lead to the formation of one seed. So, the correct option is '63'.