A) Mesoderm?Brain
B) Ectoderm?Liver
C) Mesoderm?Skeleton
D) Endodermis?Epidermis
Correct Answer: B
Solution :
The following are the tissues, organ system that the formed from three germ layers. Ectodenn is the external layer of cells of the gastrula and gives rise to CNS, nerves, retina lens, cornea of eyes, adrenal medulla, hypothalamia, pineal gland, salivary gland, skin epidermis etc. Mesoderm is the layer of cells in gastrula that lies between the ectoderm and endoderm. It develops into dermis of skin, connective tissue, muscle notochord, skeleton, blood, heart, blood vessels, spleen eyes (except lens, cornea and retina) etc. Endoderm is the internal layer of cells of gastrula that develops into digestive gland (except salivary), liver, pancreas, middle ear, eustachian tuber, thymus, parathyroid and thyroid etc.
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