Question

The theory of transfer of ions from soil to root without passing into solution was given by

• A. Jenny.
• B. Oversheet.
• C. Donnan.
• D. Both A and B.

Answer 1

The correct option is D Both A and B.

According to the theory of ions put forth by Jenny and Overstreet, ions are transferred from soil to root or vice versa without passing into solution. The ions are electrostatically adsorbed to the surface of root cells and are held tightly. These ions oscillate within a small volume of space called oscillation volume. When the oscillation volume of two ions of same charge overlap one ion is exchanged for the other. This is called contact exchange. Thus the transfer of ions from soil to root takes place without passing into solution. Thus the correct answer is option D.