Soil Formation Answers

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Which of the following does not contribute to soil consistence?

texture

temperature

organic matter

mineral types

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Microorganisms can improve soil health, but do not play a crucial role in it.

How does soil structure affect the characteristics of soil?

It determines the acidity of soil.

It determines the available nutrients of soil.

It determines the pore space within soil horizons.

It determines the amount of minerals present in soil.

Soil texture is determined by the amount and distribution of mineral particles.

Which of the following is not a way that humus affects the properties of soil?

Humus expands with increased moisture levels.

Humus increases the movement of water and air in soil.

Humus decreases the porosity of soil.

Humus acts as the basis for soil life.

How do minerals affect soil productivity?

Minerals increase soil productivity by increasing the rate of water absorption.

Minerals in the soil can eventually be used for plant growth and production.

Minerals in the soil decrease the rate of plant growth and therefore productivity of the soil.

Minerals have no measurable effect on soil productivity.

Soil reaction is _______.

the measure of the acidity or alkalinity of soil

the highest amount of cations soil can absorb

determined by the types of minerals in the soil

the layering of soil into horizons

Healthy soil depends on _______.

the size of rock particles

oxygen content

moisture content

all of the above

How do microorganisms affect humus and thereby soil health?

The presence of any microorganisms causes the destruction of humus, which leads to a reduction in soil health.

Microorganisms increase the production of humus, which leads to a decrease in soil health.

Microorganisms increase the production of humus, which leads to an increase in soil health.

Microorganisms exist independently of humus and therefore do not affect soil health.

Humus creates good soil tilth, which is an indirect benefit of microorganism action.

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