Forest Soil Science MCQs January 8, 2026August 19, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. What is the primary function of forest soils? (A) All of the above (B) To store water (C) To provide nutrients to plants (D) To support tree growth 2. Which of the following is NOT a component of soil? (A) Minerals (B) Oxygen (C) Water (D) Organic matter 3. What is âsoil pHâ? (A) The amount of organic matter in the soil (B) The color of the soil (C) The texture of the soil (D) The measure of soil acidity or alkalinity 4. Which soil horizon is known as the topsoil? (A) O horizon (B) C horizon (C) B horizon (D) A horizon 5. What does âsoil textureâ refer to? (A) The color of the soil (B) The soilâs ability to retain moisture (C) The soilâs pH level (D) The proportions of sand, silt, and clay in the soil 6. Which of the following is a primary soil mineral? (A) Organic matter (B) Clay (C) Humus (D) Water 7. What is âsoil erosionâ? (A) The process of soil formation (B) The compaction of soil (C) The addition of organic matter to soil (D) The removal of the topsoil layer by wind or water 8. What role does organic matter play in soil? (A) It improves soil structure (B) It enhances nutrient availability (C) All of the above (D) It increases soil water holding capacity 9. Which soil property affects the soilâs water holding capacity? (A) Soil color (B) Soil texture (C) Soil pH (D) Soil density 10. What is âsoil compactionâ? (A) The process of adding organic matter to soil (B) The increase in soil moisture (C) The removal of soil by wind (D) The increase in soil density due to pressure 11. Which of the following is an indicator of soil fertility? (A) Soil color (B) Soil texture (C) Soil organic matter content (D) Soil depth 12. What does âsoil structureâ refer to? (A) The soilâs mineral composition (B) The arrangement of soil particles into aggregates (C) The soilâs pH level (D) The soilâs color 13. Which soil horizon is known as the subsoil? (A) B horizon (B) A horizon (C) O horizon (D) C horizon 14. What is âsoil permeabilityâ? (A) The soilâs ability to retain water (B) The soilâs ability to hold nutrients (C) The soilâs ability to conduct water and air (D) The soilâs pH level 15. What is the term for the process of soil formation from rock? (A) Soil genesis (B) Soil erosion (C) Soil degradation (D) Soil compaction 16. Which of the following factors affects soil formation? (A) Climate (B) Parent material (C) Topography (D) All of the above 17. What is âsoil salinizationâ? (A) The accumulation of salts in the soil (B) The process of adding organic matter to soil (C) The removal of soil by erosion (D) The increase in soil pH 18. Which term describes the soil layer where leaching occurs? (A) O horizon (B) B horizon (C) A horizon (D) C horizon 19. What is âsoil leachingâ? (A) The addition of nutrients to soil (B) The removal of soluble nutrients from soil by water (C) The process of soil compaction (D) The increase in soil moisture 20. Which term refers to the process of soil losing its nutrients and becoming less productive? (A) Soil erosion (B) Soil enrichment (C) Soil compaction (D) Soil degradation