Middle gastrula is characterised by
Formation of yolk plug
Archenteron just beings to form
Blastopore and arhenteron are present
Yolk plug shifts towards blastopore
The nerve cells, brain and spinal cord or central nervous system develops from embryonic
A change in the amount of yolk and its distribution in the egg will affect
External stimulus which induces cleavage in an unfertilized ovum is called
The respiratory function of embryo is performed by
Which of the following statements is incorrect. Human spermatozoa normally