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.

This ICSE Class 6 Biology practice quiz has 50 multiple-choice questions on Soil, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz 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
   Show answer

   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
   Show answer

   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
   Show answer

   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
   Show answer

   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
   Show answer

   Answer: D. R horizon

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

More questions in this quiz

Answers and explanations are in the full quiz.

1. The uppermost layer of the Earth's surface, supporting plant life, is known as:
2. Which soil horizon is characterized by the accumulation of leached materials from the horizon above?
3. What process contributes to the formation of soil from rocks?
4. Which type of soil has the largest particle size?
5. A soil rich in humus is typically:
6. The ability of soil to hold water is known as:
7. Which of the following factors significantly influences the rate of weathering?
8. Clay soils are known for:
9. The uppermost layer of soil, primarily composed of organic matter and decomposed plant and animal remains, is called:
10. The process by which water moves through soil is called:
11. Loam is a soil type that is a mixture of:
12. What is the primary role of decomposers in soil?
13. Which horizon is often referred to as the 'true soil' due to its high organic matter and biological activity?
14. Which of the following is an example of chemical weathering?
15. A soil with a high proportion of sand is likely to have:
16. The C horizon of the soil profile is primarily composed of:
17. What term describes the process of soil particles being carried away by wind or water?
18. A soil that feels gritty and has large pore spaces is likely high in:
19. Which of the following is an example of physical weathering?
20. Soil aeration refers to:
21. Which soil texture typically holds the most water?
22. The breakdown of organic matter into simpler inorganic substances by living organisms is called:
23. The soil horizon that lies directly above the parent material is typically the:
24. Which of the following can cause soil degradation?
25. What is the significance of nitrogen in soil for plants?
26. Which soil horizon is characterized by the accumulation of clays, iron oxides, and aluminum compounds leached from above?
27. A soil that feels smooth and is sticky when wet, but can form hard clods when dry, is likely rich in:
28. Which soil type generally has the best balance of water retention and drainage?
29. What is the primary source of organic matter in most soils?
30. The ability of soil to allow water to pass through it is called:
31. Which of the following is a biotic factor affecting soil formation?
32. The layer of soil that is typically most rich in nutrients and supports the most plant life is the:
33. Sandy soils tend to be:
34. What is the role of bacteria and fungi in the soil?
35. The process of soil particles sticking together to form aggregates is called:
36. Which mineral particle size is intermediate between sand and clay?
37. What is humus?
38. Which soil horizon is often described as a zone of illuviation, meaning it has accumulated materials leached from above?
39. The gradual process of breaking down rocks and minerals into smaller particles by physical, chemical, and biological agents is called:
40. Which soil type is known for its high water-holding capacity but can become waterlogged and poorly aerated?
41. Sustainable soil management aims to:
42. The movement of dissolved minerals and organic matter downwards through the soil profile is called:
43. Which component of soil provides essential nutrients like phosphorus and potassium for plant growth?
44. A soil that feels smooth and floury, and has moderate water retention and drainage, is likely high in:
45. The process of soil being blown away by wind is a form of:

More quizzes

• Structure and Function of Plant Parts▶ Play
• Classification of Living World - Plants & Animals▶ Play
• Health and Hygiene▶ Play
• Our Environment▶ Play

Browse all Biology quizzes

More to play