Question

Assertion: A cell swells up when present in a hypotonic solution. Reason: More water molecules enter the cell than they leave. *
a) Both (A) and (R)

Answer 1

Explanation:

Both assertion and reason are correct and reason is the correct explanation of assertion.

Answer 2

Both assertion and reason are correct, and the reason is the correct explanation of the assertion.

• The concentration of the outer solution (in which the cell is situated) is lower in a hypotonic solution than the concentration of cell sap.
• Endosmosis, or the admission of water from the outside into the cell through the plasma membrane, happens when a cell is placed in a hypotonic solution, making the cell once more turgid and causing it to swell.
• Exosmosis happens when a cell is placed in a hypertonic solution.
• Plasmolyzed cells are those in which the protoplasm shrinks and separates from the cell wall, causing the cell to become flaccid.
• So, plasmolysis results from exosmosis.
• Hence, a cell swells up when present in a hypotonic solution because more water molecules enter the cell than they leave.

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