Answer:
Option: "B".
Explanation:
A plant cell remains unchanged in shape or size when it is kept in isotonic solution.
Isotonic solution is the solution having same physical conditions, same osmotic pressure outside and inside the cell.
Osmotic pressure of isotonic solution allows equal movement of cell components from inside the cell to outside of the cell through semi permeable membrane to maintain the state of equilibrium.
Hence, plant cell remains unchanged in isotonic solution.
