This quiz works best with JavaScript enabled. Home > Soil Science > Chemistry > Soil Chemistry – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Soil Chemistry Quiz 2 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The presence or absence of mountains and valleys, is also involved in soil formation. A) Topography. B) Time. C) Climate. D) Organism. Show Answer Correct Answer: A) Topography. 2. What is the pH range which provides for the optimal availability of plant essential nutrients (elements)? A) 12.3-14.2. B) 6.3-7.2. C) 2.3-3.3. D) None of the answers are correct. Show Answer Correct Answer: B) 6.3-7.2. 3. ..... is the topmost layer of soil. A) Topsoil. B) Subsoil. C) Nitrogen. D) Bedrock. Show Answer Correct Answer: A) Topsoil. 4. What type of molecule is water? A) Polar. B) Negative. C) Positive. D) Universal. Show Answer Correct Answer: A) Polar. 5. Which of the following is true. In a soil with a high clay content A) More lime is required to correct pH. B) Nitrogen leaching is more likely. C) There is a low water-holding capacity. D) Will drain much faster and better than sandy soil. Show Answer Correct Answer: A) More lime is required to correct pH. 6. What do you mean by humas A) The rotting of dead matter in the soil. B) Rocks. C) Action of breaking rocks by wind. D) A vertical session. Show Answer Correct Answer: A) The rotting of dead matter in the soil. 7. Which element causes soil to appear red? A) Calcium. B) Iron. C) Silicon. D) Nickel. Show Answer Correct Answer: B) Iron. 8. These are pesticides that come from natural sources such as plants or bacteria. A) Insecticides. B) Biopesticides. C) Rodenticides. D) Herbicides. Show Answer Correct Answer: B) Biopesticides. 9. Capillarity occurs due to A) Cohesion and adhesion. B) Gravitational movement. C) Hygroscopic adhesion. D) None of above. Show Answer Correct Answer: A) Cohesion and adhesion. 10. Which type of soil has a gritty texture? A) Sand. B) Silt. C) Clay. D) Loam. Show Answer Correct Answer: A) Sand. 11. What do the letters PH stand for? A) Potassium Hydrate. B) Potential Hydrogen. C) Potassium and Holding. D) Acidic solution. Show Answer Correct Answer: B) Potential Hydrogen. 12. When soils are waterlogged it is likely that this nutrient will be lost through leaching, resulting eventually in the older leaves of the plant yellowing. A) N2O - Nitrous Oxide. B) Nitrogen. C) Oxygen. D) Atomospheric gases (Air). Show Answer Correct Answer: B) Nitrogen. 13. In which state of energy will water move? A) High energy to low energy. B) Low energy to high energy. C) High energy to high energy. D) Low energy to low energy. Show Answer Correct Answer: A) High energy to low energy. 14. During which process is nitrogen moved from the air to the soil to be used by plants and then returned to the atmosphere to be used again? A) Ammonification. B) Nitrogen cycle. C) Fixtation. D) Water cycle. Show Answer Correct Answer: B) Nitrogen cycle. 15. Why is it important to plant row crops directly near the water line? A) So the plant can get as much gravitational water as it can before it runs through. B) So the water front can reach the plant. C) So the dry soil can pull the water towards plant. D) None of above. Show Answer Correct Answer: B) So the water front can reach the plant. 16. Soil that is saturated is said to have a water potential of ..... A) Zero. B) Negative. C) Positive. D) None of above. Show Answer Correct Answer: A) Zero. 17. Water potential can be defined as A) The ability for water to bond. B) The adhesion of water. C) The ability for water to move in soil. D) Water moving through a substance. Show Answer Correct Answer: C) The ability for water to move in soil. 18. What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere? A) Assimilation. B) Fixation. C) Ammonification. D) Denitrification. Show Answer Correct Answer: D) Denitrification. 19. Soil acidity results from many sources. Select a natural process which can cause soil acidity. A) The reaction of Carbon Dioxide and Water. B) Use of organic fertilizers. C) Nitrification of ammonium fertilizers. D) An inherently sandy soil. Show Answer Correct Answer: A) The reaction of Carbon Dioxide and Water. 20. ..... is the conversion of organic nitrogen into ammonia A) Nitrogen Fixation. B) Ammonification. C) Denitrification. D) Assimilation. Show Answer Correct Answer: B) Ammonification. ← PreviousNext →Related QuizzesSoil Science QuizzesSoil Chemistry Quiz 1Soil Chemistry Quiz 3Soil Chemistry Quiz 4Soil Chemistry Quiz 5Soil Chemistry Quiz 6 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books