CBSE Class 12-science Answered
Study the figure given below and answer the questions that
follow:
(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 the inner cell mass after implantation in the uterus.
(d) Where are the stem cells located in this embryo?
(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 the inner cell mass after implantation in the uterus.
(d) Where are the stem cells located in this embryo?
Asked by Topperlearning User | 13 Jun, 2014, 10:55: AM
Expert Answer
(a) The figure represents the blastula stage of human embryo (also called blastocyst).
(b) The ‘a’ in the figure is trophoblast (trophoectoderm). The trophoblast gives rise to extra-embryonic membranes for protection and nourishment of the embryo.
(c) The inner cell mass (after implantation in the uterus) gives rise to three germ layers (ectoderm, mesoderm and endoderm) or simply embryo.
(d) Inner cell mass (embryonal knob) represents the stem cells.
Answered by | 13 Jun, 2014, 12:55: PM
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