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Biological Classification Test - 60

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Biological Classification Test - 60
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Smallest bacterium among the following is
    Solution
    Dialister pneumosintes is a nonfermentative, anaerobic, gram-negative bacillus. It was formerly called as Bacteroides pneumosintes. It is the smallest bacteria among the given organisms. Its size is approximately 0.5×0.5×1.6 µm.  
    Thus, the correct answer is 'Dialister pneumosintes.'
  • Question 2
    1 / -0
    Escherichia coli present in human colon is
    Solution
    Escherichia coli are Gram-negative, facultative aerobic bacteria. They are common inhabitant of human intestines. These strains of E. coli are harmless. They form the part of the normal microbiota of the colon. They live in symbiotic association. They are called as commensals. They benefit hosts by producing vitamin K$$_2$$ and preventing colonization of the intestine with pathogenic bacteria.
    Thus, the correct answer is 'Commensal.'
  • Question 3
    1 / -0
    Bacteria useful in biogas fermentation are
    Solution
    Marsh gas is also called as biogas. It is also called as methane gas as it primarily consists of methane gas along with hydrogen sulfide and carbon dioxide in minor composition. It is a produced by the decomposition of vegetable matter under water by anaerobic bacteria. Bacteria useful in biogas fermentation are Methanogens. They are found in marshes.
    Thus, the correct answer is 'Methanogens.'
  • Question 4
    1 / -0
    Which amino acid is present only in bacteria and cyanobacteria?
    Solution
    The cell wall of bacteria and cyanobacteria is made up of Peptidoglycan or murein. It is a polymer that is made up of sugars and amino acids. Diaminopimelic acid and muramic acid amino acids are present in the wall of bacteria and cyanobacteria. The sugar component is made up of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM). Muramic acid is then attached to the amino acid chain of L-alanine, D-glutamic acid, diaminopimelic acid (DAP) and D-alanine. 
    Thus, the correct answer is 'Diaminopimellic acid.'
  • Question 5
    1 / -0
    When a bacterial cell possesses a flagellum on its anterior and posterior sides, the condition is called?
    Solution
    There are four types of flagellar arrangements based on the number and placement of flagella on the cell. These are, 
    1. Monotrichous - A single flagellum extends from one end of the cell.
    2. Amphitrichous - A single flagellum or multiple flagella extend from two ends of the cell.
    3. Lophotrichous - Tuft of flagella extend from one end or both ends of the cell.
    4. Peritrichous - Multiple flagella randomly distributed over the entire bacterial cell.
    Thus, the correct answer is 'Amphitrichous.'
  • Question 6
    1 / -0
    A free living aerobic and non-photosynthetic nitrogen fixing bacterium is
    Solution
    The atmospheric nitrogen is not available to plants. There are some nitrogen fixing bacteria which converts atmospheric nitrogen into ammonia which is readily available to plants. Anabaena is a free-living as well as symbiotic nitrogen fixing bacteria. Clostridium is a free-living, anaerobic nitrogen fixing bacteria. Azotobacter are free-living, aerobic, and non-photosynthetic nitrogen fixing bacteria. Rhizobium is non free living symbiotic nitrogen fixing bacteria.
    Thus, the correct answer is 'Azotobacter.'
  • Question 7
    1 / -0
    Which one is used as a biofertilizer?
    Solution
    Nostoc is a Blue Green algae. It is a unicellular organism. It is used as nitrogen fixing bacteria. It fixes atmospheric nitrogen into ammonia and make it available to the plants. It does this as free-living bacteria as well as in symbiotic association. Hence, it is used as biofertilizer by increasing the amount of nitrogenous compound in the soil. 
    Thus, the correct answer is 'Nostoc.'
  • Question 8
    1 / -0
    Photosynthetic pigments of bacteria are located in
  • Question 9
    1 / -0
    Colourless, unicellular, cell wall bound spherical or rod-shaped microorganisms, lacking organized nucleus are
    Solution
    Bacteria belongs to prokaryotes, one of the 2 major groups. They are unicellular organisms that lack internal membrane-bound organelles. They do not have a true nucleus. Instead, they have the incipient nucleus called as nucleoid. Nucleoid is  an irregularly shaped region that contains genetic material DNA. They are colourless. They have cell wall. They are either spherical, rod shaped or spiral in shape.
    Thus, the correct answer is 'Bacteria.'
  • Question 10
    1 / -0
    A growth promoting rhizobacterium, which produces an iron chelating substance is 
    Solution
    Rhizobium japonicum is a bacterial species. These bacteria form a symbiotic association with the leguminous plants by the formation of nodules. They help through nitrogen fixation. The other strain of this bacterium is known as Bradyrhizobium japonicum has the ability to form iron-chelating substances.

    Therefore A is the correct option. 
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