Biology
Assertion: The cell membrane of a cell is selectively permeable as it allows the entry or exit of certain substances only.
Reason: The cell membrane acts as a rigid barrier, protecting cells from mechanical injury and pathogen attack.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Cell
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Answer
A is true but R is false.
Reason — A is true as the cell membrane (plasma membrane) is selectively permeable, meaning it controls what enters and leaves the cell (e.g., water, gases, ions, etc.).
R is false as the cell membrane is flexible, not rigid. The cell membrane does not act as a rigid protective barrier, protection is done by cell wall.
Therefore, A is true but R is false is the correct option.
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