Acrosome reaction in sperm is triggered by:
Capacitation
Release of lysin
Influx of Na+
Release of fertilizin
Egg is liberated from ovary in:
Secondary oocyte stage
Primary oocyte stage
Oogonial stage
Mature ovum stage
Blastopore is:
Opening of neural tube
Opening of gastrocoel
Future anterior end of embryo
Found in blastula
During cleavage, what is true about cells?
Nucleocytoplasmic ratio remains unchanged.
Size does not increase.
There is less consumption of oxygen.
The division is like meiosis.
Freshly released human egg has:
One Y-chromosome
One X- chromosome
Two-X chromosome
Both (a) and (b)
In 28 days human ovarian cycle, ovulation occurs on:
1st day
5th day
14th day
28th day
Gonads develop from embryonic:
Ectoderm
Endoderm
Mesoderm
Both (b) and (c)
Fertilizins are emited by:
Immature eggs
Mature eggs
Sperms
Polar bodies
Extra-embryonic membranes of the mammalian embryo are derived from:
Inner cell mass
Trophoblast
Formative cells
Follicle cells
Extrusion of second polar body from egg nucleus occurs:
After entry of sperm, but before completion of fertilization
After completion of fertilization
Before entry of sperm
Without any relation of sperm entry
