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NEET 2018 · BiologyPrevious Year Question

The amnion of mammalian embryo is derived from

Answer: (C) ectoderm and mesoderm. Answer: (C) ectoderm and mesoderm Solution: The amnion is one of the extra-embryonic membranes.

  1. A.mesoderm and trophoblast
  2. B.endoderm and mesoderm
  3. C.ectoderm and mesoderm✓
  4. D.ectoderm and endoderm

Correct Answer

(C) ectoderm and mesoderm

Solution & Explanation

Answer: (C) ectoderm and mesoderm Solution: The amnion is one of the extra-embryonic membranes. After implantation, the inner cell mass differentiates into ectoderm and endoderm, with mesoderm appearing between them; the amnion develops from the amniotic ectoderm lined externally by extra-embryonic mesoderm. NCERT names the three germ layers but does not detail amnion derivation, so this is an extension of standard mammalian embryology built on the germ-layer text. NCERT Reference: Ch 2, p.38, line 3 — "into an outer layer called ectoderm and an inner layer called endoderm. A"

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