Soil Formation

25 July 2022
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17 test answers

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question
Microorganisms in soil _______.
answer
all of the above
question
How do organic farming practices relate to soil health?
answer
all of the above
question
Good soil tilth allows for _______.
answer
increased porosity
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What is the distinction between soil structure and soil texture?
answer
Soil texture is the % of sand, silt and clay particles in the soil. Soil structure is the way the sand , silt and clay combine together.
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The separation of soil into distinct layers is _______.
answer
horizonation
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Which of the following properties of soil has the greatest effect on plant and microorganism growth?
answer
soil reaction
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What soil properties are influenced by microorganism activity?
answer
Microorganism activity affects soil acidity and the amount of organic matter in soil. It also affects the nutrient and mineral levels in soil as well as soil structure.
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Explain how microorganisms, humus, and soil health are related.
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Humus is decayed organic matter in soil. Humus is a result of plant and animal matter being incorporated into soil through the action of soil microorganisms. Humus benefits soil health by providing nutrients for soil life, increasing the porosity of soil, and creating good soil tilth.
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Explain how soil structure affects the physical properties of soil.
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Soil structure is the arrangement of soil peds. This arrangement determines the space between soil peds, which determines the porosity of soil.
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Explain how plant life is benefited when microorganisms release carbon dioxide into the soil.
answer
When microorganisms release carbon dioxide into the soil, the acidity of water surrounding soil particles is increased. This increase in acidity allows for rock present in soil to be broken down, releasing minerals into the soil. These minerals are then available for use by plant life.
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Soil reaction is _______.
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the measure of the acidity or alkalinity of soil
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Soil texture is determined by the amount and distribution of mineral particles.
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True
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Microorganisms can improve soil health, but do not play a crucial role in it.
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False
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Which of the following soil properties is not influenced by microorganism activity?
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none of the above
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Which of the following is an effect of organic matter on soil?
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improved soil structure
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Decomposition of plant and animal matter present in soil is largely due to soil microorganisms.
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True
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Which of the following does not contribute to soil consistence?
answer
temperature