Soils

1

With reference to agricultural soils, consider the following statements:

  1. A high content of organic matter in soil drastically reduces its water holding capacity.
  2. Soil does not play any role in the sulphur cycle.
  3. Irrigation over a period of time can contribute to the salinization of some agricultural lands.

Which of the statements given above is/are correct?

  1. 1 and 2 only
  2. 3 only 
  3. 1 and 3 only 
  4. 1, 2 and 3
2

Which of the following methods is/are suitable for soil conservation in hilly regions?

  1. Terracing and contour bunding
  2. Shifting cultivation
  3. Contour ploughing

Select the correct answer using codes given below:

  1. Only 2
  2. Only 3
  3. 1 and 3
  4. 1, 2 and 3
3

Which one among the following is a micro nutrient present in soil for various crops?

  1. Potassium
  2. Magnesium
  3. Calcium
  4. Manganese
4

Which of the following statements regarding laterite soils of India are correct?

  • 1. They are generally red in colour.
  • 2. They are rich in nitrogen and potash.
  • 3. They are well-developed in Rajasthan and UP.
  • 4. Tapioca and cashew nuts grow well on these soils.

Select the correct answer using the codes given below.

  1. 2 and 3
  2. 1 and 4
  3. 2, 3 and 4
  4. 1, 2 and 3