Q. Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
A) no movement of water
B) equilibrium between the two
C) movement of water from cell A to B
D) movement of water from cell B to A
Explanation
[Solution from source] Water moves towards the cell with the higher diffusion pressure deficit (suction pressure). Cell B has a DPD of 5 atm and cell A only 3 atm, so water flows from A to B. Comparing osmotic pressures alone would wrongly suggest movement towards A. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.