PATHOLOGY MCQ
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What are the three layers found in a mature soil profile?
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Sand, silt, and loam
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Gravel, sand, and silt
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Topsoil, humus, and parent material
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Topsoil, subsoil, and parent material
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Explanation:
Detailed explanation-1: -The main layers of the soil are topsoil, subsoil and the parent rock . Each layer has its own characteristics.
Detailed explanation-2: -Soils are named and classified based on their horizons. The soil profile has four distinct layers: 1) O horizon; 2) A horizon; 3) B horizon, or subsoil; and 4) C horizon, or soil base (Figure 31.2. 2). The O horizon has freshly decomposing organic matter-humus-at its surface, with decomposed vegetation at its base.
Detailed explanation-3: -Parent material is the geologic material from which soil horizons form. There are seven variations of parent material. Weathered Bedrock, Till, Outwash Deposit, Eolian Sand, Loess, Alluvium, and Local Overwash.
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