BOTANY

Detailed explanation-1: -zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.

Detailed explanation-2: -Fertilization is the union of a sperm and egg, resulting in the formation of a zygote. The zygote undergoes many cell divisions before it implants in the lining of the uterus.

Detailed explanation-3: -fertilization, union of a sperm nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo.