Question

The amnion of mammalian embryo is derived from
A) Mesoderm and trophoblast
B) Ectoderm and mesoderm
C) Ectoderm and endoderm
D) Endoderm and mesoderm

Answer 1

Mammal or class Mammalia, is a member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. In addition to these characteristic mammary glands, mammals are distinguished by several other unique features. Hair is a typical mammalian feature.

Complete answer:
The amnion is an extraembryonic membrane that surrounds a developing embryo. It acts as a protective sac along with three other extraembryonic membranes: the yolk sac,the chorion, and the allantois. The membranes are then enclosed further by a shell (in birds, reptiles, and some mammals) or in a uterus (in most of the mammals). All the four membranes protect the developing embryo through various ways like gas exchange, nutrient delivery, and waste excretion.
The amnion is an extraembryonic membrane that surrounds an embryo. The membrane is not a part of the embryo itself, but derives from tissues that emerged from the embryo. The amnion is made up of two germ layers: the mesoderm and the ectoderm. The ectoderm forms the inner portion of the amnion, and a thin mesoderm layer connects the amnion to the chorion.
Function of Amnion
The amnion, along with the chorion, yolk sac, and allantois, forms a series of protective barriers that provide a life-support system for the developing embryo. The four membranes of the embryo work to exchange oxygen and carbon dioxide between the embryo and the placenta, to provide nutrients to the embryo, and to remove nitrogenous wastes from the embryo.

Hence the correct answer is ‘B’ Ectoderm and mesoderm

Notes: Ectoderm,endoderm and mesoderm are the germ layers of the embryo while the trophoblast is the cells that form the outer layer of a blastocyst.