Biological and Chemical Properties of Soil
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Questions and Answers

What is cation exchange capacity in soil?

  • Where one ion replaces another ion in the soil (correct)
  • The total amount of living material in a habitat
  • The process by which soil organic matter is changed into humus
  • The amount of hydrogen ions in a solution

Which soil particles have the greatest level of cation exchange?

  • Loam
  • Clay and humus (correct)
  • Silt
  • Sand

What is the pH range for acidic soil?

  • 6-8
  • 8-14
  • 0-6 (correct)
  • 7

What is humification in the context of soil?

<p>The conversion of soil organic matter into humus (C)</p> Signup and view all the answers

What role do live bacteria called nitrogen-fixing bacteria play in the Carbon Cycle?

<p>They convert nitrogen gas into nitrates (D)</p> Signup and view all the answers

What is the effect of soil pH on crop growth?

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

In the context of soil, what does biomass refer to?

<p>The amount of living material in a habitat (A)</p> Signup and view all the answers

What converts soil organic matter into humus?

<p><strong>Earthworms</strong> (A)</p> Signup and view all the answers

What is the significance of cation exchange capacity in soil?

<p>It measures the ability of soil to retain nutrients for plants (B)</p> Signup and view all the answers

Why is the pH of soil important for crop growth?

<p>To understand nutrient availability for plant uptake (B)</p> Signup and view all the answers

How does humification contribute to soil quality?

<p>By converting soil organic matter into humus (C)</p> Signup and view all the answers

What is the primary role of earthworms and bacteria in soil ecosystems?

<p>To convert soil organic matter into humus (C)</p> Signup and view all the answers

Why is nitrogen fixation essential for nutrient recycling in soils?

<p>To convert nitrogen gas into nitrates (D)</p> Signup and view all the answers

What does the term 'soil biomass' refer to?

<p>The total amount of living material in a habitat (C)</p> Signup and view all the answers

In what pH range does acidic soil typically fall?

<p>$0-6$ (B)</p> Signup and view all the answers

What is the main impact of an alkaline or basic soil pH on plant growth?

<p>Enhanced nutrient availability (B)</p> Signup and view all the answers

Which organisms are primarily responsible for converting nitrogen gas into nitrates in soils?

<p>Nitrogen-fixing bacteria (D)</p> Signup and view all the answers

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