| 1. Accumulation of \[{{K}^{+}}ions\] in the guard cells does not require energy. |
| 2. A high pH favours stomatal opening. |
| 3. Movement of chloride ions into the guard cells in the response to the electrical differential created by \[{{K}^{+}}ions\]. |
| 4. With the entry of several K+ ions and chloride ions, the water potential of guard cells increases. |
A) 1 and 3
B) 1 and 2
C) 2 and 3
D) 3 and 4
Correct Answer: C
Solution :
In the light, the pH of guard cells becomes increased due to consumption of \[C{{O}_{2}}\]in the process of photosynthesis. Guard cells receive K+ ions from subsidiary cells. This decreases the water potential of guard cells and leads to migration of water from subsidiary cells to guard cells. Uptake of K+ ions is also balanced by Cl- ions.
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