The opening and closing of the stomatal pores depends upon
Oxygen
Water in guard cells
Temperature
Concentration of carbon dioxide
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When a pair of guard cells surrounding a stoma receives the signal to open the stomatal pore, it is filled with water, thus changing the cell's shape and opening the pore. When guard cells receive a signal to close the stoma. This initiates a loss of water and causes them to shrink and the pore closes. Thus, the correct answer is option water in guard cell
option b . water in guard cell is the correct ans
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