Changing the Earth's Surface Answers

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Which of the following soil properties is not influenced by microorganism activity?

soil acidity

amount of organic matter

nutrient levels

none of the above

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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

Which of the following does not contribute to soil consistence?

texture

temperature

organic matter

mineral types

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.

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

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.

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 color is classified by _______.

using a microscope

taking core samples

determining the proportion of minerals

using a color reference chart

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

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

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