A) increases
B) decreases
C) remains same
D) both a and b
Correct Answer: A
Solution :
Stomata are the pores present generally in the epidermis of leaf. A stoma contains a pore which is surrounded by two kidney shaped guard cells. During day time\[C{{O}_{2}}\]is used in the photosynthesis which increase the pH of guard cells. (Day) decrease in\[C{{O}_{2}}=\]increase in pH of guard cells. (Night) Increase in\[C{{O}_{2}}=\]decrease in pH of guard cells.
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