Question

The three cells A, B and C are joined in a linear manner. Demonstrate the direction of water movement in these.

• A. $A\to B\to C$
• B. $A\leftarrow B\leftarrow C$
• C. $A\to B\leftarrow C$
• D. $A\leftarrow B\to C$

Answer 1

Answer: (C)

$A\to B\leftarrow C$

DPD stands for diffusion pressure deficit. When more than one solutions are placed in contact, water moves from a region of low DPD to a region of high DPD. The value of DPD is calculated as the algebraic difference of osmotic pressure (OP) and turgor pressure (TP).

In the given figure, the DPD of three cells A, B and C can be calculated as 10, 20 and 2 atmospheres respectively. Thus, water from cells A and C will move to cell B.