Question

when a cell is placed into a(n) ________ solution, the cell maintains its size. a isotonic b hypotonic c hypertonic

Explanation:

To solve this, we analyze the tonicity of solutions and their effect on cells:

• Option A (isotonic): In an isotonic solution, the solute concentration is equal inside and outside the cell. So, there is no net movement of water across the cell membrane, and the cell maintains its size.
• Option B (hypotonic): A hypotonic solution has a lower solute concentration outside the cell than inside. Water moves into the cell, causing it to swell.
• Option C (hypertonic): A hypertonic solution has a higher solute concentration outside the cell than inside. Water moves out of the cell, causing it to shrink.

Since the cell maintains its size, the solution must be isotonic.

Answer:

A. isotonic