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# Theory suggesting that carbon dioxide produced in respiration helps in mineral absorption is called

$\begin{array}{1 1}(A)\;\text{Carbonic acid exchange theory}\\(B)\;\text{Contact exchange theory}\\(C)\;\text{Active mineral and absorption}\\(D)\;\text{Donnan equilibrium }\end{array}$

Theory suggesting that carbon dioxide produced in respiration helps in mineral absorption is called carbonic acid exchange theory
Hence (A) is the correct answer.