Which element has function in opening and closing of stomata?

Explanation

Potassium (K+) plays a crucial role in the opening and closing of stomata in plants. Stomata are small pores found on the surfaces of leaves, stems, and other plant organs. They are responsible for gas exchange, allowing plants to take in carbon dioxide (CO2) for photosynthesis while releasing oxygen (O2) and water vapor. Hence option A is correct.