The layer of uterus which becomes much eroded due to placental villi is known as
Endothelium
Endometrium
Endoderm
Trophoblast
In our society women are blamed for producing female children. Choose the correct answer for the sexdetermination in humans.
Which one of the following statements about human sperm is correct?
The layer of cells immediately surrounding the ovum but outside the zona pellucida is called
Fertilisation of an egg cell it means......
$(1)$ End of process of oogenesis
$(2)$ Induces the completion of the second meiotic division
$(3)$ The corpus luteum degenerates
$(4)$ Signals for maintain progesterone level in blood
$(5)$ Formation of zygote
Which event is possible when changes in layer of zona pellucida occurs by sperm at fertilizatioi time?