HARD
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According to carbonic acid exchange theory of mineral salt absorption by roots, which of the following is incorrect?
(a) from the atmosphere combines with soil to form
(b)dissociates into and ions in soil solution.
(c)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., - ions).

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