Question

Identify the correct statement from the following :

I. Accumulation of $K^{+}$ ions in the guard cell does not require energy.
II. A high pH favoures stomatal opening.
III. Movement of chloride ions into guard cells is in response to the electrical differential created by $K^{+}$ ions
IV. With the entry of several $K^{+}$ ions and chloride ions, the water potential of guard cells increases

• A. I and II
• B. II and III
• C. III and IV
• D. I and II

Answer 1

The correct option is B II and III

Incorrect- Accumulation of $K^{+}$ ions in guard cell does require energy as it enters thorough voltage regulated potassium channels.

Correct- The decrease in stomatal opening with rise in pH and the pH of guard cell increases when the stomata opens.

Correct- Accumulation of $K^{+}$ ions in guard cell does require energy as it enters thorough voltage regulated potassium channels. Some $Cl$ ions may also enter the guard cells to maintain electro-neutrality.

Incorrect - With the entry of several $K^{+}$ ions and chloride ions, the water potential of guard cells decreases.

So, the correct answer is "option C"