Potassium performs all of the following functions in plants except:

Options

A. Maintaining anion-cation balance in the cells
B. Activation of many enzymes
C. Photolysis of water
D. Closing of stomata

Answer

To answer the question regarding the functions of potassium in plants, we can analyze each option provided:

1. **Maintaining anion-cation balance in the cells**: Potassium plays a crucial role in maintaining the balance of anions and cations within plant cells. This is essential for cellular function and overall plant health.

2. **Activation of many enzymes**: Potassium is known to activate various enzymes that are vital for numerous biochemical processes in plants. This function is critical for metabolic activities.

3. **Photolysis of water**: This process involves the splitting of water molecules during photosynthesis, which is primarily facilitated by other elements such as manganese and chlorine, not potassium. Therefore, potassium does not perform this function.

4. **Closing of stomata**: Potassium ions are involved in the regulation of stomatal movement. They help in the opening and closing of stomata, which is essential for gas exchange and transpiration in plants.

Based on the analysis of the options, the correct answer is:

**C. Photolysis of water** - Potassium does not perform this function in plants.