Soil Formation Answers

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Microorganisms play an important role in creating nutrient-rich soil.

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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.

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

Decomposition of plant and animal matter present in soil is largely due to soil microorganisms.

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.

Soil color is classified by _______.

using a microscope

taking core samples

determining the proportion of minerals

using a color reference chart

Soil structure and soil texture are essentially the same property of soil.

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

Which of the following is an effect of organic matter on soil?

improved soil structure

decreased water retention

increased nutrient loss

all of the above

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.

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