Chapter 9 Soil

  • The uppermost layer of the earth is called soil.
  • Soil provide an charge to the plants and supplies nutrients to the plant.
  • The dead and rotting matter in the soil is called humus.
  • Soil is formed by the breaking down of rocks by the action of water, wind and climate this process is called weathering.
  • Soil profile include topsoil or A- horizon, middle layer or B- horizon third layer is C- layer or the last one, this is also called as bed rock.
  • The topmost layer of the soil contain humus and it is fertile.
  • Soil contain greater proportion of big particles are called as sandy soil.
  • The soil which contains greater proportion of the fine particles are called as clayey soil.
  • The mixture of sandy, clayey and other types of soil is called loamy soil.
  • The rate of absorption of water by the soil is called the percolation rate.
  • Erosion is called the removal of upper layer of the soil.
  • Upper layer of soil has better water
  • Different types of soil is better for different crops.
  • Erosion can be prevented by growing more plants.

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Exercise 1 ( Page No. : 106 )

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