Soil Quiz - ICSE Class 6 Biology

Free practice quiz: Soil (ICSE Class 6 Biology). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a major component of soil?

   1. Mineral particles
   2. Organic matter
   3. Pure water
   4. Air
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   Answer: C. Pure water

   Soil is a complex mixture. While water is present in soil, it is not a primary component in the same way as mineral particles, organic matter (humus), and air. Pure water is a separate entity.

2. Which soil texture has the smallest particle size?

   1. Sand
   2. Silt
   3. Clay
   4. Gravel
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   Answer: C. Clay

   Clay particles are the smallest, typically less than 0.002 mm in diameter.

3. The bedrock from which soil is formed is called:

   1. Parent horizon
   2. Regolith
   3. Parent material
   4. Substratum
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   Answer: C. Parent material

   Parent material refers to the original geological material from which the soil is formed.

4. The process of adding nutrients back to the soil through the breakdown of dead organic material is known as:

   1. Leaching
   2. Erosion
   3. Nutrient cycling
   4. Compaction
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   Answer: C. Nutrient cycling

   Nutrient cycling is the continuous movement and reuse of essential elements within an ecosystem, with decomposition being a key part of this process in soil.

5. The lowest layer of the soil profile, which is essentially unweathered bedrock, is known as the:

   1. O horizon
   2. A horizon
   3. B horizon
   4. R horizon
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   Answer: D. R horizon

   The R horizon represents the solid, unweathered parent rock from which the soil has developed.

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