Q. Which of the following will be zero for a fully turgid cell :
(a) DPD or Suction pressure
(b) Wall pressure or Turgor pressure
(c) Osmotic pressure
(d) Turgor pressure
Solution :
Correct option : A The difference between osmotic pressure and turgor pressure is called suction pressure or DPD. The osmotic pressure is the pressure which allows the solutes to move inside the cell. The turgor pressure is exerted by the contents of the cell on the cell wall. The cell starts swelling due to the turgor pressure. Therefore, in a fully turgid cell, the osmotic pressure is equal to the turgor pressure DPD = OP – TP When, OP = TP So that, OP – TP = 0 DPD = 0 So, the correct answer is DPD or ‘Suction pressure’
