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The mineral of a soil consist of sand, silt, and clay.
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The mixed angular gravel, rock, and soil found at the foot of a slope is typical of alluvial parent material.
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True and False

Soil Final

QuestionAnswer
The mineral of a soil consist of sand, silt, and clay. True
The mixed angular gravel, rock, and soil found at the foot of a slope is typical of alluvial parent material. False
Plants primarily obtain the essential element C (Carbon) from the organic components of the soil. False
Secondary minerals are created through the processes of chemical weathering. True
In a representative fraction or ratio map scale (i.e. 1:20,000), the unit of the first number is the same unit as the second number. True
Soil quality gives us an idea of the value of a soil for a specific use and is a quantification of a soils physical properties only. False
Igneous rocks are formed by intense pressure and heat acting on metamorphic and sedimentary rocks. False
Soil texture can be modified with the addition of organic matter. False
The spodic horizon is an example of a diagnostic epipedon. False
Basalt is the major rock found in the Oceanic crust. False
The topmost horizon in most humid region forest soils is the A horizon. True
Residual parent materials have formed in place and have not been transported from one area to another. True
An argillic horizon is an Epipedon characterized by the illuvial accumulation of silicate clays in the B horizon. False
The map unit on a detailed soil map on the Web Soil Survey are most likely to be labeled with names from the soils Great Group. False
Secondary minerals are most prominent in the sand fraction of soils. False
The cation exchange capacity of a soil is determined primarily by the amount and kind of colloids in the soil and by the pH. True
Wildfires in forested areas result in the formation of organic compounds that enhance the percolation of water through the soil. False
The majority of gaseous interchange between the soil pores and the atmosphere occurs by mass flow of the concerned gases. False
The presence of Oxygen gas in a soil causes the reduction of certain elements which may then become toxic to soil organisms and plant roots. False
Hydrophytes are a group of wetland plants that have specialized tissues to bring O2 to the roots. True
Biological zero, 0 degrees Celsius, is the temperature where partially all biological functions terminate. False
Isomorphous substitution involves the substitution of a tetrahedral sheet for an octahedral sheet. False
A soil on the south facing slope in Canada is likely to be drier and warmer than a comparable soil on a north facing slope. True
In a dry soil most of the water that remains is found in the macro pores or in water films around soil particles. False
Field Water Efficiency is a ratio of the amount of water transpired by a crop to the amount of water applied to the field. True
Functional redundancy is the capacity to utilize a wide variety of substances and carry out a wide range of processes. False
Carbonates and bicarbonates tend to accumulate in soils of dry areas, making it common to find alkaline soils in arid and semi-arid locations. True
Active soil acidity is a measure of the H+ ion activity in the soil solution. True
Mineralization of soil organic matter results in the addition of inorganic nutrient ions to the soil solution. True
Carbonates and Bicarbonates act as a buffer at high pH levels in soil. True
The pH of a soil can never go higher than 8.4 because the ability of soils to buffer alkaline conditions. False
Wet, anaerobic soils tend to accumulate large amounts of organic matter in partially decomposed conditions. True
Poorly drained soils generally contain less organic matter then well drained soils. False
Cellulose, fats and waxes break down quickly in soils unlike sugars and starches which are complex molecules and take time for their metabolic breakdown. False
Soil Actinomycetes are a group of fungi that take part in many functions, including the fixation of atmospheric N gas in forest soils. False
Primary consumers are the soil flora or fauna that create their own energy using photosynthesis, and include organisms like algae and the roots of vascular plants. False
Excessive salinity in the soil is harmful due to the reversal of the osmotic potential in soils at the rhizosphere. True
While some soil borne bacteria and fungi are harmful, there are many of these organisms that actually carry out important functions and increase the overall soil quality. True
The pH of a soil can determine the availability of plant nutrients making the optimum pH range for nutrient availability in soils 5.5-8.0 False
Compared to the rest of the soil, the rhizosphere is kept relatively sterile by the action of the plant roots. False
Created by: slstiles52
 

 



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