SCSC 301 - Exam 3, TAMU, Dr. Howe
Questions and Answers Rated A+
What is soil permeability, and why does it matter?
✔✔Soil permeability measures how easily water and air move through soil, influencing drainage
and root health.
How do earthworms contribute to soil quality?
✔✔Earthworms improve soil structure by breaking down organic matter and increasing aeration.
What is cation exchange capacity (CEC) in soil?
✔✔CEC is the soil’s ability to hold and exchange positively charged ions, which affects nutrient
availability.
Why is soil testing done before planting crops?
✔✔Soil testing determines nutrient levels, pH, and other factors to optimize crop growth.
What effect does soil erosion have on agriculture?
1
, ✔✔Soil erosion reduces soil fertility, leading to lower crop yields and increased need for
fertilizers.
What is soil compaction, and how can it be prevented?
✔✔Soil compaction is the reduction of pore space due to heavy machinery; it can be prevented
with controlled traffic and cover crops.
What is the difference between topsoil and subsoil?
✔✔Topsoil is the nutrient-rich upper layer of soil, while subsoil lies beneath, containing fewer
nutrients.
How does soil structure affect plant roots?
✔✔Good soil structure promotes root penetration and water retention, while poor structure can
restrict growth.
What role do bacteria play in soil health?
✔✔Bacteria help decompose organic matter, fix nitrogen, and support nutrient cycling in the
soil.
2
Questions and Answers Rated A+
What is soil permeability, and why does it matter?
✔✔Soil permeability measures how easily water and air move through soil, influencing drainage
and root health.
How do earthworms contribute to soil quality?
✔✔Earthworms improve soil structure by breaking down organic matter and increasing aeration.
What is cation exchange capacity (CEC) in soil?
✔✔CEC is the soil’s ability to hold and exchange positively charged ions, which affects nutrient
availability.
Why is soil testing done before planting crops?
✔✔Soil testing determines nutrient levels, pH, and other factors to optimize crop growth.
What effect does soil erosion have on agriculture?
1
, ✔✔Soil erosion reduces soil fertility, leading to lower crop yields and increased need for
fertilizers.
What is soil compaction, and how can it be prevented?
✔✔Soil compaction is the reduction of pore space due to heavy machinery; it can be prevented
with controlled traffic and cover crops.
What is the difference between topsoil and subsoil?
✔✔Topsoil is the nutrient-rich upper layer of soil, while subsoil lies beneath, containing fewer
nutrients.
How does soil structure affect plant roots?
✔✔Good soil structure promotes root penetration and water retention, while poor structure can
restrict growth.
What role do bacteria play in soil health?
✔✔Bacteria help decompose organic matter, fix nitrogen, and support nutrient cycling in the
soil.
2
