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Solution


Q.

The amnion of mammalian embryo is derived from              [2018]
1 ectoderm and mesoderm  
2 endoderm and mesoderm  
3 mesoderm and trophoblast  
4 ectoderm and endoderm  

Ans.

(1)

Amnion, in reptiles, birds and mammals is a membrane forming a fluid-filled cavity (the amniotic sac) that encloses the embryo. During development, the amnion arises by a folding of a mass of extra-embryonic tissue called the somatopleure. Lined with ectoderm and covered with mesoderm, the amnion contains a thin transparent fluid in which the embryo is suspended, thus providing a cushion against mechanical injury.