Microbial Metabolism and Growth in Soil Ecosystems Quiz
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Questions and Answers

What type of nutrients might accumulate in dry surface soil conditions?

  • Toxic nutrients such as heavy metals
  • Synthetic nutrients such as fertilizers
  • Inorganic nutrients such as nitrogen and phosphorus
  • Biodegradable nutrients such as fecal material, animal and microbial corpses, plant residues, seeds, and fruits (correct)

What happens after the period of unlimited growth in microbial growth under favourable environmental conditions?

  • The organism enters a lag phase
  • The organism experiences rapid growth
  • Nutrients become limiting, toxic metabolites accumulate, and growth slows down (correct)
  • The organism undergoes cell death

What follows the cessation of growth in microbial growth under favourable environmental conditions?

  • Rapid growth
  • Lag phase
  • Cell death (correct)
  • Unlimited growth

In which soil area is a more consistent supply of nutrients available?

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

What happens when there is insufficient water to support microbial activity in dry surface soil conditions?

<p>Biodegradable nutrients might accumulate.</p> Signup and view all the answers

What is the large pool of less labile soil organic matter referred to as?

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

What are the conditions required for microbial growth in soil?

<p>The availability of nutrients and adequate physiochemical conditions.</p> Signup and view all the answers

What are some examples of biodegradable nutrients that might accumulate in dry surface soil conditions?

<p>Fecal material, animal and microbial corpses, plant residues, seeds and fruits.</p> Signup and view all the answers

What are the phases of microbial growth under favourable environmental conditions?

<p>Adaptive or lag phase, period of unlimited growth, nutrient limitation and accumulation of toxic metabolites, growth slowdown, growth cessation, and cell death.</p> Signup and view all the answers

What are the different growth strategies required in soil based on nutrient availability?

<p>Transient luxuriant nutrient availability, consistent supply of nutrients in the rhizosphere, and digestion of less labile soil organic matter or humus.</p> Signup and view all the answers

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