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Match items in Column A with items in Column B :
Column A :
(1) A - Horizon
(2) B - Horizon
(3) C - Horizon
(4) R - Horizon
(5) Alluvial Soil
Column B :
(a) Khadar
(b) Lumps of rocks
(c) Humus
(d) Subsoil
(e) Parent rock
(1) - (c)
(2) - (d)
(3) - (b)
(4) - (e)
(5) - (a)
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[tex] \sf \: \underline {Answer} : [/tex]
The uppermost layer or Horizon A is generally dark in colour and is rich in humus and minerals. This layer is generally soft, porous and can retain more water.
The Subsoil has a lesser amount of humus but more of minerals. This soil is present in B - Horizon.
The third layer is the C- Horizon which is made up of small lumps of rocks. with cracks and crevices.
The fourth layer which is bedrock or Horizon R contains parent rocks. It is hard and difficult to dig with a spade.
Alluvial soil also known as Khadar contains sand, slit and clays. This soil is suitable for Sugarcane, wheat and rice.
Matching:-
1.A-Horizon - (c) Humus
2.B-Horizon - (d)subsoil
3.C-Horizon - (b) Lumps of rocks
4.R-Horizon - (e) Parent rock
5.Alluvial soil - (a)Khadar
Key points:-
✦Soil horizon:- A distinct layer of soil which is parallel to the surface and possess different physical, chemical and biological characteristics than that of the layers above and beneath.
✦Types of soil horizons:
✦A - horizon :-
✦Humus: The dark, organic material present on top of the soil which is made up of dead and decaying matter, dried leaves,microbes and other nutrients,etc.
✦B - Horizon:-
✦C-Horizon:-
✦R - Horizon:-
✦Alluvial soil:-
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