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The opening and closing of the stomatal pore depends upon  (a) oxygen 

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The opening and closing of the stomatal pore depends upon 

(a) oxygen 

(b) temperature 

(c) water in guard cells 

(d) concentration of CO2 in stomata

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The answer is (c) water in guard cells

  • Opening of guard cells is facilitated by the entry of water inside guard cells. This make the guard cell become turgid. 
  • Closing of guard cells is facilitated by water coming out of guard cells. 
  • This will make the guard cells flaccid.
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