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Standard XII
Biology
Question

Epithelial layer is a .............. layer.
  1. Impermeable
  2. Permeable
  3. Transparent
  4. None of the above

A
Permeable
B
Transparent
C
Impermeable
D
None of the above
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Solution
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Epithelial cell layer covers the organs and cavities inside the body and also cover the whole body. In lung alveoli, gas exchange takes place. In blood vessels, exchange of gases, minerals takes place. In kidney tubules, various salts are exchanged. For this purpose, the outer lining made by epithelial layer should be selectively permeable as per the requirement.
Hence the correct option is B.

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