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      Question

      The reaction of a soil refers to its acidity or

      alkalinity. It is acidity or alkalinity. It is an important indicator of soil health. It can be easily measured and is usually expressed by the pH value.  i. Most soils are in the pH range of 5 – 8, while the range for plant growth is within pH 3 – 10. ii. Unfavourable high pH values, as observed in alkali soils, can be decreased by amendment with materials such as gypsum, elemental S or iron pyrites.  iii. pH of 7.5 – 8.5 is generally called the neutral range. iv. Plants are generally more sensitive to strong alkalinity, where the dominant cation is often Na, than to strong acidity where the dominant cation is H. Out of the following which combination of statements are correct?
      A i and ii only Correct Answer Incorrect Answer
      B i, ii and iv only Correct Answer Incorrect Answer
      C i, ii and iii only Correct Answer Incorrect Answer
      D i, ii, iii and iv Correct Answer Incorrect Answer

      Solution

      Statement (iii) is incorrect. pH 7 is considered neutral, and the range 7.5-8.5 is slightly alkaline.

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