Which of the following structures is porous and semi-permeable?

Cell wall

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Cell membrane

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Chromosome

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None of the above

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Solution

The correct option is B Cell membrane
The cell membrane or the plasma membrane is a porous membrane that forms the boundary to the cell cytoplasm. Though it is porous, it only allows certain molecules in or out of the cell hence it is called a semi-permeable membrane.
Cell wall is freely permeable. Chromosome is not a membrane.
Hence the correct option is B.

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