According to the proton transport theory,which ion plays an important role in the opening and closing of stomata?

Which element regulates the opening and closing of stomata?

What will be the effect of accumulation of potassium ions in guard cells?

When sugar in guard cells is converted into starch,the stomatal pore $..........$

If the rates of transpiration and water absorption of a flowering plant are measured over a period of $24$ hours,it is found that the rate of transpiration reaches its peak at about mid-day and then declines,whereas the peak for water absorption is reached approximately two hours later. Which one of the following statements provides the best explanation of these results?

Differentiate between guttation and transpiration.