Just before the endometrium is shed during menstruation:
1. blood levels of estrogen and progesterone decrease.
2. blood levels of estrogen and progesterone increase.
3. the corpus luteum gets fully developed.
4. ovulation occurs.

Blastocyst gets implanted on the:
1. myometrium
2. perimetrium
3. endometrium
4. wall of the oviduct

The cavity of the blastocyst is called as:
1. archenteron
2. amnion
3. antrum
4. blastocoel

The thick transparent glycoprotein membrane surrounding a mammalian ovum before implantation is called:

The formation of the three embryonic germ layers is called:

The rudimentary alimentary cavity of an embryo at the gastrula stage is called:
1. vegetal pole
2. primitive streak
3. archenteron
4. blastocoel

Notochord develops from embryonic:
1. ectoderm
2. mesoderm
3. endoderm
4. archenteron

An infant can get passive immunity from:

Morula stage is:
1. the stage of implantation
2. a hollow ball of cells enclosing a fluid filled space
3. a collection of 16-32 cells resembling a raspberry
4. a group of cells that do not undergo cleavage divisions

Chorion in terrestrial vertebrate embryos: