Microbial Ecology Quiz
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Questions and Answers

What type of microorganisms are usually protozoans in a hay infusion unpigmented with moving microorganisms?

  • Zooflagellates
  • Sarcodina (Amoebae) (correct)
  • Ciliophora
  • Apicomplexa
  • What type of microorganisms are greenish or golden-brown organisms usually?

  • Actinomycetes
  • Cyanobacteria
  • Algae (correct)
  • Protozoans
  • What do organisms that appear blue-green usually represent?

  • Fungi
  • Protozoans
  • Cyanobacteria (correct)
  • Algae
  • What is the movement type of microorganisms in Phylum Mastigophora?

    <p>Via flagella</p> Signup and view all the answers

    What is the purpose of the buried-slide technique in the Contact Slide Assay?

    <p>Useful for observing soil fungi, actinomycetes, and bacteria via microscopy</p> Signup and view all the answers

    What does urea provide in the context of spatial interactions of soil microorganisms?

    <p>Nitrogen source</p> Signup and view all the answers

    What do bacteria tend to look like in the soil?

    <p>Small, rounded shapes due to nutritional stress</p> Signup and view all the answers

    What are actinomycetes characterized by in the soil?

    <p>Thin strings</p> Signup and view all the answers

    What is the purpose of HOAc in the Contact Slide Assay?

    <p>Fixes the microorganisms on the glass slide</p> Signup and view all the answers

    What do fungi have in the context of spatial interactions of soil microorganisms?

    <p>Thick filamentous hyphae</p> Signup and view all the answers

    What is the characteristic movement of microorganisms in Phylum Ciliophora?

    <p>Via cilia</p> Signup and view all the answers

    What is the direct method of checking the air for viable microorganisms?

    <p>Settling plate</p> Signup and view all the answers

    What is the range of microbial load for a normal plate count?

    <p>30 - 300 CFUs</p> Signup and view all the answers

    What is the purpose of sugars in dried grass in the Hay Infusion for isolating and identifying microorganisms?

    <p>Provide food for bacteria and other microbes</p> Signup and view all the answers

    What is the main characteristic of a crowded plate in standard plate count?

    <p>TNTC</p> Signup and view all the answers

    What is the media plate used for the growth of microorganisms in the gravitational settling method?

    <p>Settling plate</p> Signup and view all the answers

    What causes the appearance of a spreader in the film of water between the agar and the bottom of the plate?

    <p>Disintegration of bacterial clumps</p> Signup and view all the answers

    What is the primary objective of isolating and identifying protozoa, cyanobacteria, and microalgae from freshwater sources?

    <p>To isolate and identify microorganisms</p> Signup and view all the answers

    What drives smaller particles to settle slower in gravitational settling?

    <p>Air currents</p> Signup and view all the answers

    What is the primary function of a spreader plate in microbial ecology?

    <p>To spread out bacterial colonies</p> Signup and view all the answers

    What is the role of the bacteria in the Hay Infusion for isolating and identifying microorganisms?

    <p>Serve as food for the protozoa</p> Signup and view all the answers

    What does TNTC stand for in the context of standard plate count?

    <p>Too numerous to count</p> Signup and view all the answers

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