A cell 'A' with D.P.D. = 8 is surrounded by three cells 'B', 'C' and 'D' with D.P.D. respectively 4, 6 and 5. What shall be the direction of water movement :
(2) A → B → C → D
(3) D → C → B ← A
(4) A → B ← C → D
Correct Answer is: (1)
