Single Choice

When stomata are opening; we observe which of the following changes in the guard cells?

AOP increase and TP decreases
Correct Answer
BOP and TP increases
COP decreases, TP increases
DOP and TP decreases

Solution

DPD is diffusion pressure deficit. It is calculated by algebraic difference of osmotic pressure and turgor pressure. Water flows from a region of low DPD to a region of high DPD. Thus, any factor which increases DPD will favour movement of water into the cell.
During stomatal opening water moves into the guard cells and they swell and become turgid. This movement of water into the guard cells is made possible due to a an increase in DPD (increase in OP and decrease in TP).

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