Presumptive endoderm is formed in frog’s blastula by:
A.Most of the animal hemisphere
B.Most of the vegetal hemisphere
C.Partially by both of these
D.None of these
A.Most of the animal hemisphere
B.Most of the vegetal hemisphere
C.Partially by both of these
D.None of these
A.Ectoderm, mesoderm and endoderm layers
B.Ectoderm layer surrounding the blastocoel
C.Ectoderm and endoderm layers forming archenteron
D.Ectoderm, mesoderm and endoderm layers alongwith a rudimentary nervous system
A.Epitheliochorial type
B.Haemochorial type
C.Haemoendothelial types
D.None of these
A.Morula
B.Blastula
C.Gastrula
D.None of these
A.Respiratory
B.Nervous
C.Digestive
D.Circulatory
A.50 hours of oviposition
B.110 hours of oviposition
C.200 hours of oviposition
D.250 hours of voiposition
A.Direct
B.Indirect
C.Both (a) & (b)
D.None of these
A.Amnion and chorion
B.Allantois
C.Yolk sac
D.All of these
A.Blastocoel
B.Archenteron
C.Mesoderm
D.Notochord