Question

a. Name the layer of cells that forms the outer
wall of blastocyst.
b.At what stage is the mammalian embryo implanted
in uterus?
c. Despite the presence of so many sperms in vanity
of an egg cell, only one sperm
enters the ovum- why?
d.How many polar bodies are given out in
production of one egg during oogenesis?​

Answer 1

Answer:

a= Trophoblast

b= Blastocysts stage

c= because after the entry of one egg zona pellucida becomes impermeable for others sperm .

d=2

Answer 2

Answer:a. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoele.

b. Blastocyst is the stage of the human embryo in which it gets implanted in the uterus ( 6 days after an egg is fertilized.

c. After the entry of the male sperm nucleus inside the egg, there is thickening of the zona pellucida of the ovum and as a result of this only one sperm can enter the cell.

d. Three polar bodies.

hope it will help u dear

Explanation: