Most of the nutrients essential for growth are supplied to plants directly from the ___
Cosmic Radiation
Atmosphere
Humus
Rain Water
Soil Solution
Which of the following is (are) essential plant nutrients?
Sr
Al
Cu
Pb
All of the above
The lithosphere is made up of ___
Air
Rock
Plants and animals
Water
The layers of contrasting material found when on digs a hole in the ground are called ___
Pedons
Pseudoliths
Horizons
Soil structure
Regoliths
A soil profile consists of (choose the best answer)
The sum of chemical and physical data known about a soil
The way a soil "feels"
The set of layers in a vertical cross-section of the soil
The general outline of a soil or groups of soil when viewed from the side
The spatial boundaries of a particular soil
"Subsoil" is generally equivalent to which soil horizon?
A
O
C
H
In a typical mineral soil in optimal condition for plant growth, approximately what percentage of the pore space would be filled with water and what percentage filled with air?
10% water; 90% air
90% water; 10% air
50% water; 50% air
25% water; 75% air
25% water; 25% air
The amount of different sizes of mineral particles in a soil defines soil ___
Pore space
Profile
Texture
Solution
Personality
The water in the soil typically differs from pure water because soil water ___
Contains mineral nutrients
Is restrained in its flow by attraction to particle surfaces
Contains organic compounds
None of the above
Except for some kinds of food, modern industry has made human dependence on soils a thing of the past.
Most of the water in our rivers and lakes has come in contact with and been affected by soil.
Plants can be grown without any soil.
The mineral particles in soil consist of sand, silt, and clay.
Most, if not all, of the nutrient supply stored in a fertile soil is in forms readily available to plants.
