According to carbonic acid exchange theory of mineral salt absorption by roots, which of the following is incorrect?

Options

A. `CO_(2)` released by the respiration of roots combines with soil `H_(2)O` to form `H_(2)CO_(3)`
B. `H_(2)CO_(3)` dissociates into `H^(+)` and `HCO_(3)^(-)` ions in soil solution.
C. `H^(+)` ions may be exchanged for cations adsorbed on clay particles.
D. Cations thus released into soil solution are adsorbed on root cells in exchange for anions (e.g., `Cl^(-)` ions.)

Answer

D

Explanation

According to carbonic acid exchange theory `CO_(2)` released during respiratio of roots combines with soil water to form carbonic acid `(H_(2)CO_(3)).H_(2)CO_(3)` dissociates into `H^(+)` and `HCO_(3)^(-)` ions in soil solution. The `H^(+)` ions may get exchanged for cations adsorbed on clay particles the cations thus released into soil solution from the clay particles may et adsorbed on roots cells in exhange for `H^(+)` ions or as ions pairs with `HCO_(3)^(-)`