Question 1

Which of the following is considered a biotic feature of soil?

Accepted Answer

Soil biota

Question 2

A farmer notices that his soil has become compacted after repeated use of heavy machinery. Which soil property is most directly affected by this compaction?

Accepted Answer

Soil porosity

Question 3

Which of the following best defines soil texture?

Accepted Answer

Proportion of sand, silt, and clay in soil

Question 4

What is the optimal proportion of soil that should consist of pore spaces (air and water)?

Accepted Answer

About 50%

Question 5

Which type of erosion occurs at a faster rate?

Accepted Answer

Accelerated erosion

Question 6

A soil sample has a high cation exchange capacity (CEC). What does this indicate about the soil?

Accepted Answer

It can retain more nutrients for plant growth

Question 7

Which management practice can help restore soil porosity after compaction?

Accepted Answer

Adding gypsum and organic material

Question 8

Which of the following is a chemical property of soil that can be altered by management practices?

Accepted Answer

Soil pH

Question 9

What causes acid rain formation in terrestrial ecosystems?

Accepted Answer

Sulfur dioxide and nitrogen oxide emissions reacting with water

Question 10

Application of lime ($$CaCO_3) to a $$forest ecosystem affected by acid rain will most likely:

Accepted Answer

Reverse the effects of acid rain and increase potential for earthworm invasion

Question 11

Which of the following best defines soil structure?

Accepted Answer

Arrangement and binding of soil particles into peds (aggregates)

Question 12

A soil with high bulk density and low porosity is most likely to:

Accepted Answer

Have poor water infiltration and root growth

Question 13

Which factor is NOT directly involved in soil formation?

Accepted Answer

Irrigation frequency

Question 14

Which soil property is most likely to be controlled by weathering and not generally altered by management practices?

Accepted Answer

Soil development

Question 15

Which of the following management practices can help remediate acid rain effects in soils?

Accepted Answer

Adding limestone and magnesite

Question 16

Why is soil biota important for ecosystem services?

Accepted Answer

It facilitates biogeochemical cycles and nutrient availability

Question 17

Which of the following is a biological property of soil that can be altered by management practices?

Accepted Answer

Soil biota

Question 18

A gardener wants to grow blueberries, which prefer acidic soils. Which soil pH range should she aim for?

Accepted Answer

$$4.5 - 5.5$$

Question 19

Which of the following is the best example of a soil management practice that increases soil porosity?

Accepted Answer

Adding organic material

Question 20

Which equation best represents the chemical reaction for the neutralization of acid rain by limestone?

Accepted Answer

$$CaCO_3 + 2H$$^+ \rightarrow $$Ca^{2+}$$ + $$CO_2 + H_2O$

The Nature of Soils: Properties, Formation, and Ecological Importance

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