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# Active $K^+$ exchange mechanism for opening and closing of stomata was given by

$\begin{array}{1 1}(A)\;\text{Darwin}\\(B)\;\text{Levitt} \\(C)\;\text{Scarth}\\(D)\;\text{Khorana }\end{array}$

Active $K^+$ exchange mechanism for opening and closing of stomata was given by Levitt
Hence (B) is the correct answer.