A) presence of oxygen
B) low CO2 concentration
C) high CO2 concentration
D) absence of CO2
Correct Answer: B
Solution :
| [B] Light causes photosynthesis which lead to reduction in CO2 concentration \[\to \] synthesis of glycolate \[\to \] oxidation of glycolate \[\to \] ATP synthesis \[\to \] activation of K+ pump \[\to \] movement of K+ in guard cell \[\to \] movement of water into guard cells \[\to \] swelling of guard cell \[\to \] openingof stomata. |
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