A Difference in Charge Across a Guard Cell Membrane Is

Question

A difference in charge across a guard cell membrane is called ____.  
A) osmosis
B) tension
C) turgor
D) pressure gradient
E) voltage

Accepted Answer

A difference in charge across a membrane is called voltage, which is measured in volts (V). In guard cells, this difference in voltage is what drives the opening and closing of stomata for gas exchange and water loss regulation.