Question

Study the given diagram:


A is an embryonic stage which gets transformed into B, which in turn gets implanted in the endometrium in human females.

a) Identify A , B and its parts C and D.
b) State the fate of C and D in the course of embryonic developement in humans. [3 marks]

Answer 1

a) A represents the morula [0.25]
B represents the blastocyst [0.25]
C represents inner cell mass [0.25]
D is the trophoblast [0.25]

b) C, which is the inner cell mass gets differentiated as the embryo. [1 mark]

D, which is the trophoblast layer gets attached to the endometrium. [1 mark]