Column A Column B Column C

i) Invagination i) Movement of epithelial cells as a unit to enclose deeper layers of the embryo i) Hypoblast in birds

ii) Involution ii) Splitting of one cellular sheet into two parallel sheets ii) Ectoderm in amphibians

iii) Ingression iii) Infolding of epithelium iii) Mesoderm in amphibians

iv) Delamination iv) Migration of individual cells from surface into interior of the embryo iv) Endoderm in sea urchin

v) Epiboly v) Inward movement of expanding outer layer so that it spreads over the internal surface of remaining external cells v) Mesoderm in sea urchin

Which one of the following is the correct combination?

Question

Column A	Column B	Column C
i) Invagination	i) Movement of epithelial cells as a unit to enclose deeper layers of the embryo	i) Hypoblast in birds
ii) Involution	ii) Splitting of one cellular sheet into two parallel sheets	ii) Ectoderm in amphibians
iii) Ingression	iii) Infolding of epithelium	iii) Mesoderm in amphibians
iv) Delamination	iv) Migration of individual cells from surface into interior of the embryo	iv) Endoderm in sea urchin
v) Epiboly	v) Inward movement of expanding outer layer so that it spreads over the internal surface of remaining external cells	v) Mesoderm in sea urchin