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Study the figure and answer the question...

Study the figure and answer the questions.
(a) Name the stage of human embryo the figure represents.
(b) Identify 'a' in the figure and mention its function.
( c) Mention the fate of inner cell mass after implantation in the uterus.
(d) Where are the stem cells located in this embryo?

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(a) Blastocyst
(b) Trophoblast or trophoectoderm. (i) It forms chorion, amnion and extra embryonic mesoderm. (ii) Secretes of hCG (human chorionic gonadotropin).
( c) Formation of three germinal layers, first endoderm, then ectoderm and mesoderm.
(d) Inner cell mass.
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