Lungs are _ in srcin.
Correct answer: B. Endodermal
- A. Ectodermal
- B. Endodermal
- C. Mesodermal
- D. Preformed
Explanation
The correct answer is Endodermal. The endoderm, one of the three primary germ layers formed during embryonic development, is responsible for the formation of the respiratory tract lining, including the lungs. This layer also forms other vital internal organs such as the liver, pancreas, and parts of the digestive system. The ectoderm and mesoderm, while important for forming other bodily structures, do not contribute to the primary functional tissue of the lungs. 'Preformed' is unrelated to germ layer origins and lung development.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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About Embryonic Development
Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.
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