Major Biomes and Soils

1. Which of the following statements about soil properties is correct?

  1. All soil textures are the same
  2. Clay is the coarsest soil particle
  3. Soil chemistry does not depend on texture
  4. The soil’s texture is influenced by the ratio of sand, silt, and clay particles
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Answer: Option D. The soil’s texture is influenced by the ratio of sand, silt, and clay particles

2. Which of the following are main components of soil?

  1. Soil color
  2. Soil temperature
  3. Inorganic materials
  4. Soil texture
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Answer: Option C. Inorganic materials

3. Which is the finest of all soil fractions?

  1. Clay
  2. Silt
  3. Sand
  4. Gravel
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Answer: Option A. Clay

4. Which of the following statements about soil and its coloration is correct?

  1. Soils that are high in humus tend to appear dark due to the color of decomposed organic matter
  2. All soils are light in color
  3. Yellow soils always indicate sand content
  4. Dark soils contain only minerals
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Answer: Option A. Soils that are high in humus tend to appear dark due to the color of decomposed organic matter

5. Which of the following statements about soils are true?

  1. All soils are nutrient-rich
  2. Sandy soils hold more water than clay soils
  3. Most soils contain decomposed plant and animal materials known as humus
  4. Humus is only found in forest soils
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Answer: Option C. Most soils contain decomposed plant and animal materials known as humus