Q. Study the following table showing the components of water potential in closely arranged mesophyll cells namely A, B and C. [table] Cell | Osmotic Potential (MPa) | Pressure Potential (MPa) ; A | -0.21 | 0.05 ; B | -0.22 | 0.02 ; C | -0.23 | 0.05 [/table] Identify two of the following, which show correct direction of water movement between two cells. I A$\rightarrow$B II B$\rightarrow$C III C$\rightarrow$A IV C$\rightarrow$B
A) I, II
B) II, III
C) I, IV
D) II, IV
Explanation
Water potential in a cell is equal to algebraic sum of solute potential and pressure potential. [table] Cell | Water Potential | DPD ; A | -0.21+0.05=-0.16 | +0.16 ; B | -0.22+0.02=-0.20 | +0.20 ; C | -0.23+0.05=-0.18 | +0.18 [/table] Water potential is equal but opposite to DPD. Water move from low DPD cell to high DPD cell.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.