A metal ion involved in stomatal regulation is

Options

(a) iron
(b) potassium
(c) zinc
(d) magnesium

Correct Answer:

potassium

Explanation:

Stomata are small pores in plant epidermis,present in large numbers,particularly in leaves,through which gaseous exchange occurs.Each stomata has 2 bean or kidney shaped cells called guard cells surrounded by a few specialised epidermal cells called subsidiary cells.The opening and closing of stomatal aperture is regulated by turgidity of guard cells which is brought about by entry/exit of K⁺ ions.