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Doctors Medicines MCQs Q&A

  1. Only A
  2. A and B
  3. B and C
  4. A and C
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1 Answers

Option 3 : B and C

The correct answer is B and C.

Concept:

  • Wheat is the second most important cereal crop in the world.
  • It is the primary food crop in the north and northwestern regions of the country.
  • It requires 50 to 75 cm of annual rainfall distributed evenly throughout the growing season.
  • A good crop of wheat requires 12 to 15 inches of water.

Water holding capacity:

  • The ability of a particular soil texture to physically hold water against the force of gravity is referred to as its water holding capacity.

Explanation:

  • For the best growing of wheat the water retaining property is high and moderate also contain particle property like large number of fine and big paticles which is same in number.

Thus, B and C (Clayey soil and loamy soil) is the best for growing wheat.

Soil is of different types: clayey, loamy and sandy.
The soil is classified on the basis of the proportion of particles of various sizes.

  • Sandy soil:
    • If soil contains greater proportion of big particles it is called sandy soil. 
    • Percolation rate of water is highest in the sandy soil.
    • Sand particles are quite large. They cannot fit lose together, so there are large spaces between them. These spaces are filled with air. Thus, the aeration in sandy soil is good.
    • Due to the good aeration in soil water can drain quickly through the spaces between the sand particles. Thus, the water holding capacity of sandy soil is low.
  • Clayey soil:
    • If the proportion of fine particles is relatively higher, then it is called clayey soil. 
    • Percolation rate of water is least in the clayey soil.
    • Clay particles, being much smaller, pack tightly together, leaving little space for air. Thus, the aeration in clayey soil is poor.
    • Clayey soil are heavy so they hold more water as compared to other soils.
    • It is also harmful to many plants. It is only suitable for crops that require a lot of water, such as wheat.
  • loamy soil:
    • If the amount of large and fine particles is about the same, then the soil is called loamy.
    • Percolation rate of water is slow to medium in the clayey soil.
    • Loamy soil is made up of roughly equal parts clay, sand, and silt. Thus, the aeration in loamy soil is moderate.
    • The water holding capacity of loamy soil is moderate.
    • Crops such as wheat, sugarcane, cotton, jute, pulses, and oilseeds grow in loamy soil.
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