| Consider the following statements: |
| 1. Calcium is a dominant ion in soil which gives a physical and chemical stability to the clay humus complex. |
| 2. The presence of calcium ions in the soil solution antagonizes the uptake of other ions such as boron magnesium and phosphate. |
| Which of the above statements is/are correct? |
A) 1 only
B) 2 only
C) Both 1 and 2
D) neither 1 nor 2
Correct Answer: C
Solution :
[c] All soils contain calcium ions (Ca2+) and magnesium (Mg2+) cations (positively charged ions) attracted to the negative exchange sites on clays and organic matter (cation exchange complex of the soil).
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