5. humans affect soil formation by\na. landscaping.\nb. irrigating.\n6. the land class with the fewest…

5. humans affect soil formation by\na. landscaping.\nb. irrigating.\n6. the land class with the fewest limitations is\na. class i.\nb. class iii.\n7. the land classes suitable for field crop production are\na. i, ii, iv, vi.\nb. i, ii, iii, iv.\n8. the horizon that is most supportive of plant growth is\na. horizon o.\nb. horizon a.\n9. the smallest soil particle is\na. clay.\nb. gravel.\n10. good soil structure means\na. aggregated.\nb. crumbly.\n11. soil ph is generally raised by adding\na. sulfur.\nb. nitrogen.\n12. hydroponics refers to\na. aggregate culture.\nb. aeroponics.\n13. the importance and use of hydroponics is\na. increasing.\nb. decreasing.\n14. hydroponically grown plants differ principally from soil - grown plants in\na. light requirements.\nb. nutrient requirements.\n15. the best and most economical light source for growing plants hydroponically is\na. incandescent.\nb. fluorescent.

5. humans affect soil formation by\na. landscaping.\nb. irrigating.\n6. the land class with the fewest limitations is\na. class i.\nb. class iii.\n7. the land classes suitable for field crop production are\na. i, ii, iv, vi.\nb. i, ii, iii, iv.\n8. the horizon that is most supportive of plant growth is\na. horizon o.\nb. horizon a.\n9. the smallest soil particle is\na. clay.\nb. gravel.\n10. good soil structure means\na. aggregated.\nb. crumbly.\n11. soil ph is generally raised by adding\na. sulfur.\nb. nitrogen.\n12. hydroponics refers to\na. aggregate culture.\nb. aeroponics.\n13. the importance and use of hydroponics is\na. increasing.\nb. decreasing.\n14. hydroponically grown plants differ principally from soil - grown plants in\na. light requirements.\nb. nutrient requirements.\n15. the best and most economical light source for growing plants hydroponically is\na. incandescent.\nb. fluorescent.

Answer

Brief Explanations:

  1. Humans impact soil formation through landscaping (changing terrain) and irrigating (altering water - soil interaction).
  2. Class I land has the fewest limitations for various uses.
  3. Classes I - IV are more suitable for field crop production due to better soil and terrain conditions.
  4. Horizon A is rich in organic matter and most supportive of plant growth.
  5. Clay particles are the smallest among soil particles.
  6. Good soil structure is both aggregated (clumps of particles) and crumbly (easy to break apart).
  7. Lime is used to raise soil pH as it is alkaline.
  8. Hydroponics is a form of nutriculture where plants are grown without soil.
  9. The use and importance of hydroponics are increasing due to factors like space - efficiency and controlled environment.
  10. Hydroponically grown plants differ mainly in nutrient requirements as they get nutrients from a solution instead of soil.
  11. Sunlight is the best and most economical light source for hydroponic plant growth as it is free and provides a full - spectrum light.

Answer:

  1. a. landscaping, b. irrigating
  2. a. Class I
  3. b. I, II, III, IV
  4. b. horizon A
  5. a. clay
  6. a. aggregated, b. crumbly
  7. c. lime
  8. c. nutriculture
  9. a. increasing
  10. b. nutrient requirements
  11. d. sunlight