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Microbes in Human Welfare Test - 31

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Microbes in Human Welfare Test - 31
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  • Question 1
    1 / -0
    Which of the following is not used as a biopesticide?
    Solution

    A.Correct option: D
    B. Explanation for correct option:

    • Xanthomonas campestris is not used as a biopesticide because it is a plant pathogen.
    • Thus, it is not a biopesticide. 

    C.  Explanation for incorrect option:
    Option A: Biopesticides are certain types of pesticides made up of living microorganisms.
    Bacillus thuringiensis (or Bt) is a biopesticide that can block the gut of insects and kill them. 
    Option B: Trichoderma harzianum: This is a bio-pesticide useful for the management of fungal pathogens such as Fusarium species and Phytophthora species as well as nematodes.
    Option C: The nuclear polyhedrosis virus (NPV) which belongs to the family Baculoviruses is a virus affecting insects, predominantly moths and butterflies. It has been used as a pesticide for crops infested by insects susceptible to contraction. 

  • Question 2
    1 / -0
    The bacteria present in root nodules of leguminous plants that fixes the atmospheric nitrogen is
  • Question 3
    1 / -0
    How Rhizobium helps in nitrogen fixation?
  • Question 4
    1 / -0
    Name a food product prepared by the action of bacteria.
  • Question 5
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    Directions For Questions


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    Which of the following nitrogen-fixing bacteria is present in root nodules of leguminous plants?
  • Question 6
    1 / -0
    Which term refers to the tiniest organisms that can only be seen through a microscope?
  • Question 7
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    Bacteria such as__________can fix atmospheric nitrogen and convert it into usable nitrogenous compounds.
  • Question 8
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    Rhizobium _______
    Solution
    Rhizobium lives in the root modules of leguminous plants (pulses), with which it has symbiotic relationship.
  • Question 9
    1 / -0
    Azolla a type of an aquatic fern, is used as a biofertiliser in a paddy field due to its ability to fix the atmospheric nitrogen. This is possible because of 
    Solution
    Many species of cyanobacteria are used as biofertilizers and help in nitrogen fixation. The species of cyanobacteria called as Anabaena azollae is commonly used in paddy fields for improving the quality and amount of yield. They are ideally suited for propagation in rice fields because they are capable of fixing atmospheric nitrogen in organic forms with the help of the enzyme nitrogenase present in the heterocyst cells. It helps to increase the nitrogen content of moist soil and water bodies, which can be used in increasing paddy yield.
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an
    Solution
    Bacillus thuringiensis produces a natural insecticide that has been used for decades by organic farmers to control crop-eating insects and by the World Health Organization to kill mosquitoes without using dangerous chemical pesticides. Bacillus thuringiensis also occurs naturally in the gut of caterpillars of various types of moths and butterflies.
    Therefore, the correct answer is option B.
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