2.Human Reproduction
normal

Epiboly is the process of

A

Rotation of gastrula within vitelline membrane so that animal pole becomes anterior

B

Overgrowth of micromeres which divide rapidly and spread downward over megameres except at yolk plug

C

Mass migration of cells from animal hemisphere so that upper micromeres migrate over edge of dorsal lip, roll inside and tucked beneath outer layer

D

Formation of small slit like invagination upon grey crescent

Solution

Epiboly – descending of dividing cells to cover other cells.
Invagination – tucking in blastula wall.
Emboly – Upward movement of dividing cells underneath the cells

Standard 12
Biology

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