Question

For maintaining the turgidity of guard cells, a continuous supply of .......... is required.

• A. Na${}^{+}$ and ATP
• B. K${}^{+}$ and ATP
• C. K${}^{+}$ and Na${}^{+}$
• D. ATP

Answer 1

Answer: (B)

K${}^{+}$ and ATP

• Guard cells help for regulating the rate of transpiration by opening and closing the stomata.
• When the guard cells are swollen, then this turgidity is due to the accumulation of K ions in guard cells.
• As K ion level increases, the water potential of guard cells also drops and then water enters into the guard cells.
• Then it requires the energy which is utilized from ATP form of energy. Thus this needs a constant supply of ATP.
• So the correct answer is$K^{+}$ and ATP.
• Correct option is B.