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Light and Soil - Class 7

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  • In order for plants to grow, the cells require nutrients in the form of minerals. The minerals come from
    Soil
  • The topmost fertile layer (Horizon A) is rich in
    Humus
  • Dentists would like to see the larger image of our teeth. What kind of mirror would you suggest for them?
    Concave Mirror
  • Any two differences between the clayey soil and sandy soil.
    Sandy soil contains larger particles and cannot hold water. Clayey soil contains fine particles and can hold water.
  • The rotting dead matter in the soil is called
    Humus
  • Identify the Mirrors
    Concave Mirror-Curved inward and Convex Mirror-Curved outward
  • Define Rectilinear Propagation of light
    Light always travels in a straight line. This property is called as Rectilinear Propagation of light.
  • Which mirror is otherwise called as "converging mirror"?
    Concave Mirror