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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
Top soil contains the following:
  • A
    Humus and living organisms only.
  • B
    Humus and soil particles only.
  • C
    Humus, living organisms and plants.
  • ✓
    Humus, living organisms and soil particles.
✓

Answer

Correct option: D.
Humus, living organisms and soil particles.
The term soil profile is the vertical section of earth’s crust, which is made up of a succession of horizontal layers also called as horizons, each of which varies in thickness, colour, texture, structure, consistency, porosity, acidity and composition. The upper or A-horizon is the top soil which contains most of the litter living organisms and humus. It also has a zone of leaching, through which dissolved materials weep downward. The roots of small plants are embedded in top soil. The second or $B-$horizon is composed of the mineral soil (sub soil).
The third or $C-$horizon contains the unconsolidated parent material. The last or $D-$horizon comprises of rock or unmodified parent material.

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