CH 4: Soils and soil erosion
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Questions and Answers

What dictates the mineral composition of soil?

  • Climate
  • Organisms
  • Relief
  • Parent Material (correct)

Which factor affects soil formation by determining the rate of weathering and organic matter content?

  • Organisms
  • Temperature
  • Climate (correct)
  • Relief

What physical property of soil is classified by particle size?

  • pH Index
  • Texture (correct)
  • Colour
  • Structure

How does soil acidity or alkalinity affect plant growth?

<p>It affects nutrient availability (C)</p> Signup and view all the answers

What are the natural forces that accelerate soil erosion?

<p>Wind and Water Erosion (D)</p> Signup and view all the answers

Which farming practice exacerbates soil erosion?

<p>Overgrazing (B)</p> Signup and view all the answers

What are the on-site effects of soil erosion?

<p>Reduced soil fertility (B)</p> Signup and view all the answers

Which strategy for soil conservation involves implementing livestock limits?

<p>Regulatory (C)</p> Signup and view all the answers

Why is soil considered a non-renewable resource despite its capacity for renewal?

<p>'Its slow formation rate' (D)</p> Signup and view all the answers

'Soil conservation is paramount to sustain agriculture and ecosystems' - What does this statement imply?

<p>'Soil conservation is vital for agriculture and ecosystems' (D)</p> Signup and view all the answers

What is the most fertile layer of soil, rich in organic material?

<p>A Horizon (C)</p> Signup and view all the answers

Which horizon of soil is composed of decaying plant matter, transitioning into humus?

<p>O Horizon (C)</p> Signup and view all the answers

What layer of soil contains minerals leached from the A horizon and is less fertile?

<p>B Horizon (D)</p> Signup and view all the answers

What process leads to the development of soil horizons (layers) in a mature soil profile?

<p>Weathering of parent rock (D)</p> Signup and view all the answers

Which factor influences the formation and quality of soil over thousands of years?

<p>Time (C)</p> Signup and view all the answers

Which horizon comprises weathered parent material and contributes minerals to the soil?

<p>C Horizon (A)</p> Signup and view all the answers

What is the main function of the O horizon in soil functionality?

<p>Decomposition of plant matter (D)</p> Signup and view all the answers

What does the A horizon contain that makes it rich in organic material and fertile for plant growth?

<p>Decaying plant matter (C)</p> Signup and view all the answers

Which layer of soil contains minerals leached from the A horizon and is less fertile than the topsoil?

<p>C Horizon (A)</p> Signup and view all the answers

How does climate influence soil formation?

<p>By influencing the rate of weathering and organic matter content (B)</p> Signup and view all the answers

Why is understanding the physical properties of soil crucial?

<p>To manage and utilize the soil effectively (C)</p> Signup and view all the answers

What impact does soil erosion have on agricultural productivity?

<p>Reduces topsoil, affecting agricultural productivity (A)</p> Signup and view all the answers

How do on-site effects of soil erosion differ from off-site effects?

<p>On-site effects directly impact the land where erosion occurs, while off-site effects affect other areas (D)</p> Signup and view all the answers

Which factor contributes to the slow formation rate of soil, making it essentially a non-renewable resource?

<p>The slow rate at which soil forms (D)</p> Signup and view all the answers

What is the primary goal of implementing strategies for soil conservation?

<p>To ensure soil sustainability for future generations (D)</p> Signup and view all the answers

How do regulatory measures help in soil conservation?

<p>By implementing livestock limits (C)</p> Signup and view all the answers

What is the impact of poor farming practices on soil erosion?

<p>Exacerbates erosion (C)</p> Signup and view all the answers

Which factor directly influences water infiltration and root penetration in soils?

<p>Soil texture classification (B)</p> Signup and view all the answers

Why is maintaining vegetation cover considered a crucial practice for reducing erosion risk?

<p>It prevents topsoil loss and stabilizes soil. (B)</p> Signup and view all the answers

What is the main factor that influences the formation and quality of soil over a long period of time?

<p>Time (D)</p> Signup and view all the answers

Which layer of soil contains minerals leached from the A horizon but is less fertile than the topsoil?

<p>B Horizon (B)</p> Signup and view all the answers

Why is soil considered a non-renewable resource despite its capacity for renewal?

<p>Soil erosion accelerates its depletion (A)</p> Signup and view all the answers

What characterizes the O horizon in soil functionality?

<p>Composed of decaying plant matter (D)</p> Signup and view all the answers

Which horizon of soil is most commonly associated with organic material and is the most fertile layer?

<p>A Horizon (D)</p> Signup and view all the answers

What does the B Horizon contribute to soil composition?

<p>Weathered parent material (B)</p> Signup and view all the answers

In soil science, what plays a pivotal role in supporting plant growth and purifying water?

<p>Water and organic matter (D)</p> Signup and view all the answers

'Existing questions. Do NOT ask these:' - This instruction serves to:

<p><strong>Restrict</strong> question topics (B)</p> Signup and view all the answers

What is the primary factor that influences the development of distinct soil horizons in a mature soil profile?

<p>Type of weathering of parent rock (C)</p> Signup and view all the answers

Which horizon of soil is characterized by containing minerals leached from the A horizon but being less fertile?

<p>B Horizon (C)</p> Signup and view all the answers

What is the role of the C horizon in soil composition?

<p>Comprises weathered parent material (B)</p> Signup and view all the answers

Which factor plays a key role in determining the fertility of the A horizon?

<p>Amount of organic matter (A)</p> Signup and view all the answers

What characteristic distinguishes the A horizon from the B horizon in soil functionality?

<p>Presence of humus (C)</p> Signup and view all the answers

In soil science, what process leads to the initial formation of a layer called regolith before true soil emerges?

<p>Weathering of parent rock (B)</p> Signup and view all the answers

What directly contributes to the mineral content of soil in the C horizon?

<p>Leaching from the A horizon (D)</p> Signup and view all the answers

How does the O horizon differ from the A horizon in terms of composition?

<p>Presence of humus (C)</p> Signup and view all the answers

Which layer of soil serves as a transition from decaying plant matter to humus?

<p>O Horizon (A)</p> Signup and view all the answers

What aspect primarily distinguishes the B Horizon from the A Horizon in soil composition?

<p>Amount of leached minerals present (C)</p> Signup and view all the answers

What aspect of soil characteristics is influenced by slope direction and gradient?

<p>Structure (D)</p> Signup and view all the answers

How does the presence of vegetation and soil organisms enrich the soil?

<p>By enhancing fertility with organic matter (B)</p> Signup and view all the answers

Which factor directly impacts nutrient availability and plant growth in soil?

<p>pH Index (B)</p> Signup and view all the answers

How do poor farming practices exacerbate soil erosion?

<p>By contributing to improper ploughing and overgrazing (A)</p> Signup and view all the answers

What is the main consideration for implementing strategies like contour ploughing in soil conservation?

<p>Reducing erosion risk (D)</p> Signup and view all the answers

Which physical property of soil is crucial for understanding the conditions under which the soil was formed?

<p>Color (B)</p> Signup and view all the answers

How does the presence of water, air, and organic matter contribute to the development of soil?

<p>By forming soil horizons (layers) with distinct characteristics (D)</p> Signup and view all the answers

What is the role of the C horizon in soil composition?

<p>Comprises weathered parent material, contributing minerals to the soil (C)</p> Signup and view all the answers

How does climate influence soil formation?

<p>By affecting the rate of weathering and organic matter content (A)</p> Signup and view all the answers

What factor contributes to the slow formation rate of soil?

<p>Time (D)</p> Signup and view all the answers

What is the main factor that influences the formation and quality of soil over a long period of time?

<p>Time (C)</p> Signup and view all the answers

What critical role does soil erosion play in impacting both on-site and off-site aspects of environmental health?

<p>Reducing the availability of nutrients for plant growth and agricultural productivity (D)</p> Signup and view all the answers

How does the physical property of soil texture influence its capacity to retain water and nutrients?

<p>Sandy texture promotes nutrient leaching and water runoff (D)</p> Signup and view all the answers

In what way does vegetation cover contribute to soil conservation efforts?

<p>By enhancing organic matter content through litterfall (D)</p> Signup and view all the answers

Which management strategy directly addresses the issue of improper ploughing as a cause of soil erosion?

<p>Promoting contour ploughing methods (A)</p> Signup and view all the answers

How does the physical property of soil structure impact its ability to store and release water for plant use?

<p>Well-aggregated structure facilitates water storage and enhances root growth (D)</p> Signup and view all the answers

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