Question 1

Which of the following pH values represents the most acid condition?

Accepted Answer

A)   1.0
B)   10.0
C)   7.0
D)   100
E)   5.55F) C) and D)
G) A) and E)

Question 2

Increasing the organic matter content of a soil is likely to _____.

Accepted Answer

A)   have no effect on water holding capacity
B)   increase the soil's water holding capacity
C)   decrease the soil's water holding capacityD) All of the above
E) B) and C)

Question 3

Most (usually 80% or more)  of soil potassium and calcium can be found in the form of _________________.

Accepted Answer

A)   dissolved substances
B)   structural components of minerals
C)   exchangeable ions
D)   organic compoundsE) None of the above
F) A) and B)

Question 4

Hydroponics will likely be a key element in enabling the world to feed and clothe its increasing human population in the next few decades.

Accepted Answer

A) True 
 B)False

Question 5

The amount of different sizes of mineral particles in a soil defines the soil ________.

Accepted Answer

A)   structure
B)   texture
C)   pore space
D)   solution
E)   profileF) A) and D)
G) B) and D)

Question 6

In humid regions most rainwater that soaks into the soil and is not used by plants eventually flows into rivers and streams.

Accepted Answer

A) True 
 B)False

Question 7

Where organic matter constitutes only 1 or 2 percent of the soil by weight, it has only negligible influence on soil properties.

Accepted Answer

A) True 
 B)False

Question 8

Subsoil is typically equivalent to the O horizon.

Accepted Answer

A) True 
 B)False

Question 9

Most of the different nutrients essential for growth are supplied to plants directly from the ______.

Accepted Answer

A)   rain water
B)   soil solution
C)   atmosphere
D)   cosmic radiation.
E)   humusF) A) and E)
G) C) and E)

Question 10

The lithosphere is made up of _________.

Accepted Answer

A)   air
B)   rock
C)   water
D)   plants and animals
E)   all of the aboveF) C) and E)
G) A) and C)

Question 11

While many organisms depend on the soil for nutrients and water, only a few very specialized organisms live in the soil itself.

Accepted Answer

A) True 
 B)False

Question 12

Soil, like concrete and steel, is a standard construction material. Its properties are well characterized and predictable so that standard building foundation designs can be used uniformly at all building sites of a given topography.

Accepted Answer

A) True 
 B)False

Question 13

Practices that tend to increase the amount of organic matter in soils would be expected to reduce the global greenhouse effect.

Accepted Answer

A) True 
 B)False

Question 14

The mineral particles in soil consist of sand, silt, and clay.

Accepted Answer

A) True 
 B)False

Question 15

Compared to silt, clay-sized soil particles are characterized by ______.

Accepted Answer

A)   greater attraction for water
B)   greater proportion of primary minerals
C)   less tendency to form hard clods when dry
D)   less capacity to hold nutrients in plant-available formsE) B) and D)
F) B) and C)

Question 16

"Topsoil" is generally equivalent to which soil horizon?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) A) and B)
G) A) and D)

Question 17

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?

Accepted Answer

A)   10% water and 90% air
B)   90% water and 10% air
C)   25% water and 25% air
D)   50% water and 50% air
E)   25% water and 75% airF) None of the above
G) B) and E)

Question 18

Most of the water in our rivers and lakes has come in contact with and has been affected by soils.

Accepted Answer

A) True 
 B)False

Question 19

In a given soil, the horizon with the highest organic matter content is generally the _____ horizon.

Accepted Answer

A)   E
B)   C
C)   D
D)   B
E)   AF) A) and B)
G) A) and C)

Question 20

Which of the following pH values represents a neutral condition?

Accepted Answer

A)   1.0
B)   5.0
C)   6.0
D)   7.0
E)   10F) C) and E)
G) B) and C)

Exam 1: The Soils Around Us

Soil, like concrete and steel, is a standard construction material. Its properties are well characterized and predictable so that standard building foundation designs can be used uniformly at all building sites of a given topography.

Correct AnswerverifiedShow Answer

Most of the different nutrients essential for growth are supplied to plants directly from the ______.

Correct AnswerverifiedShow Answer

The amount of different sizes of mineral particles in a soil defines the soil ________.

Correct AnswerverifiedShow Answer

Most of the water in our rivers and lakes has come in contact with and has been affected by soils.

Correct AnswerverifiedShow Answer

While many organisms depend on the soil for nutrients and water, only a few very specialized organisms live in the soil itself.

Correct AnswerverifiedShow Answer

Most (usually 80% or more) of soil potassium and calcium can be found in the form of _________________.

Correct AnswerverifiedShow Answer

Practices that tend to increase the amount of organic matter in soils would be expected to reduce the global greenhouse effect.

Correct AnswerverifiedShow Answer

"Topsoil" is generally equivalent to which soil horizon?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Hydroponics will likely be a key element in enabling the world to feed and clothe its increasing human population in the next few decades.

Correct AnswerverifiedShow Answer

The lithosphere is made up of _________.

Correct AnswerverifiedShow Answer

The mineral particles in soil consist of sand, silt, and clay.

Correct AnswerverifiedShow Answer

Which of the following pH values represents the most acid condition?

Correct AnswerverifiedShow Answer

Compared to silt, clay-sized soil particles are characterized by ______.

Correct AnswerverifiedShow Answer

In a given soil, the horizon with the highest organic matter content is generally the _____ horizon.

Correct AnswerverifiedShow Answer

Where organic matter constitutes only 1 or 2 percent of the soil by weight, it has only negligible influence on soil properties.

Correct AnswerverifiedShow Answer

In humid regions most rainwater that soaks into the soil and is not used by plants eventually flows into rivers and streams.

Correct AnswerverifiedShow Answer

Increasing the organic matter content of a soil is likely to _____.

Correct AnswerverifiedShow Answer

Which of the following pH values represents a neutral condition?

Correct AnswerverifiedShow Answer

Subsoil is typically equivalent to the O horizon.

Correct AnswerverifiedShow Answer

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