Question

explain the process of formation of embryo sac?​

Answer 1

As the fusion occurs two times then it is known as DOUBLE FERTILIZATION. After that the zygote develops into a embryo and the triploid primary endosperm nucleus into endosperm which provide nourishment to the growing embryo. And then the ovule develop into seed and ovary fruit.

Answer 2

Answer:

Embryonic stem cells possess the ability to differentiate into endothelium. The ability to produce large volumes of endothelium from embryonic stem cells could provide a potential therapeutic modality for vascular injury. We describe an approach that selects endothelial cells using magnetic beads that may be used therapeutically to treat arterial injury.

FORMATION

o sac The female gametophyte (an oval structure in the nucellus of the ovule) of flowering plants, formed by the division of the haploid megaspore nucleus, and the site of fertilization of the egg and development of the embryo. It consists of 6 haploid cells without cell walls (2 synergidae, 3 antipodal cells, and an egg cell) and 2 haploid nuclei (polar nuclei). Sometimes the 2 haploid, polar nuclei fuse to form a single, endosperm moter cell. At fertilization, 1 male nucleus fuses with the egg nucleus to form a zygote which develops into the embryo. The second male nucleus fuses with the primary endosperm nucleus to form the endosperm nucleus. This then divides to form the endosperm. See also DOUBLE FERTILIZATION.