Q. The osmotic potential and pressure potential of three cells (A, B, C) located in different parts of an actively transpiring plant are given below. [table] Cell | Osmotic Potential (MPa) | Pressure Potential (MPa) ; A | -0.87 | 0.44 ; B | -0.92 | 0.34 ; C | -0.68 | 0.27 [/table] Identify these three cells as root hair, root cortical and leaf mesophyll cells respectively. The correct answer is
A) A, B, C
B) A, C, B
C) C, A, B
D) B, C,A
Explanation
Water potentials of the given cells are $\Psi = \Psi_{s} + \Psi_{p}$ A=-0.87+0.44=-0.43 B=-0.92+0.34=-0.58 C=-0.68+0.27=-0.41 As water moves from greater water potential to less, root hair, root cortical and leaf mesophyll cells are C, A, B respectively.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.