Physical Geography - World Soils, Major Biomes

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1.
Which among the following is/are major components of soil?
  1. Inorganic materials
  2. Soil water
  3. Soil air
  4. Organic matter
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2.
Which among the following is/are correct about soils?
  1. Most soils contain decayed plant and animal materials, collectively called humus.
  2. Humus rich soils have a good capacity for water retention.
  3. It is important in chemical reaction that help plants extract nutrients.
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3.
Which among the following statements is/are correct about the soil and its color?
  1. Soils rich in humus tend to be dark because decomposed organic matter is black or brown.
  2. Red or yellow soils typically indicate the presence of magnesium.
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4.
Which among the following is/are correct about soils?
  1. The texture of the soil is determined by the proportion of the sand, silt and clay particles.
  2. Sand being the finest of all plays the most important role in soil chemistry.
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5.
Which among the following is the finest of all soil fractions?

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