The opening and closing of the stomatal pore depend upon:
Water in guard cells
The correct option is C.
Explanation of the correct option:
Explanation of the incorrect option:
Option A:
The opening and closing of the stomatal pores do not depend upon oxygen.
Option B:
The opening and closing of the stomatal pores do not depend upon temperature.
Option D:
The opening and closing of the stomatal pores do not depend upon the concentration of CO2 in stomata.
Final answer: The opening and closing of the stomatal pore depend upon water in guard cells.