AGRY 105 Lab Final questions &
correct answers rated A+ 2025/2026
What are the 6 horizons? - correct answer ✔✔O, A, E, B, C, R
O Horizon - correct answer ✔✔organic matter
A horizon - correct answer ✔✔mineral horizon high in Organic Matter (topsoil)
E horizon - correct answer ✔✔leached mineral horizon (zone of leaching)
B horizon - correct answer ✔✔Zone of accumulation
C Horizon - correct answer ✔✔unconsolidated parent material (slightly weathered)
R horizon - correct answer ✔✔Consolidated bedrock (un-weathered)
soil particle size (largest to smallest) - correct answer ✔✔sand, silt, clay
Granular - correct answer ✔✔A horizon
Platy - correct answer ✔✔E horizon
Blocky - correct answer ✔✔B horizon
, Prismatic/Columnar - correct answer ✔✔B and C horizon
Massive - correct answer ✔✔R horizon
Soil that is dark brown to black - correct answer ✔✔levels of O.M.
Soil that is white to light grey - correct answer ✔✔chemicals that color soil have leached out
Soil that is light brown, yellow to red - correct answer ✔✔oxidized materials and adequate
drainage
Soil that is bluish-grey - correct answer ✔✔reduced iron compounds and anaerobic conditions
Soil that is mottled - correct answer ✔✔mix of conditions and that the soil is water-logged for
part of the year
Well drained soils - correct answer ✔✔no grey or mottles above 30in
Moderately well drained soils - correct answer ✔✔some grey/mottles between 18-30in
somewhat poorly drained - correct answer ✔✔grey/mottles between 10-18in but is
predominantly brown
poorly drained - correct answer ✔✔grey/mottles 10-18in and is predominantly grey
monocots - correct answer ✔✔fibrous root systems, scattered vascular bundles in stems and
leaves, parallel veins (corn, wheat, sorghum)
correct answers rated A+ 2025/2026
What are the 6 horizons? - correct answer ✔✔O, A, E, B, C, R
O Horizon - correct answer ✔✔organic matter
A horizon - correct answer ✔✔mineral horizon high in Organic Matter (topsoil)
E horizon - correct answer ✔✔leached mineral horizon (zone of leaching)
B horizon - correct answer ✔✔Zone of accumulation
C Horizon - correct answer ✔✔unconsolidated parent material (slightly weathered)
R horizon - correct answer ✔✔Consolidated bedrock (un-weathered)
soil particle size (largest to smallest) - correct answer ✔✔sand, silt, clay
Granular - correct answer ✔✔A horizon
Platy - correct answer ✔✔E horizon
Blocky - correct answer ✔✔B horizon
, Prismatic/Columnar - correct answer ✔✔B and C horizon
Massive - correct answer ✔✔R horizon
Soil that is dark brown to black - correct answer ✔✔levels of O.M.
Soil that is white to light grey - correct answer ✔✔chemicals that color soil have leached out
Soil that is light brown, yellow to red - correct answer ✔✔oxidized materials and adequate
drainage
Soil that is bluish-grey - correct answer ✔✔reduced iron compounds and anaerobic conditions
Soil that is mottled - correct answer ✔✔mix of conditions and that the soil is water-logged for
part of the year
Well drained soils - correct answer ✔✔no grey or mottles above 30in
Moderately well drained soils - correct answer ✔✔some grey/mottles between 18-30in
somewhat poorly drained - correct answer ✔✔grey/mottles between 10-18in but is
predominantly brown
poorly drained - correct answer ✔✔grey/mottles 10-18in and is predominantly grey
monocots - correct answer ✔✔fibrous root systems, scattered vascular bundles in stems and
leaves, parallel veins (corn, wheat, sorghum)
