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Biological Classification Test - 57

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Biological Classification Test - 57
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  • Question 1
    1 / -0
    The conidia are borne on stetrigmata which are in turn borne by ____________.
    Solution
    Asexual reproduction in ascomycetes (the phylum Ascomycota) is by the formation of conidia, which are borne on specialized stalks called conidiophores.
  • Question 2
    1 / -0
    A crustose lichen is ____________
    Solution
    Graphis scripta is a crustose lichen in Graphidaceae family.
    It is commonly called script lichen.
  • Question 3
    1 / -0
    Cell wall of bacteria$$/$$ cyanobacteria possesses
    Solution
    Bacteria and cyanobacteria both are prokaryotic organisms. They both lack true cell organelles. They both posses nucleoid instead of a true nucleus. Nucleoid is a genetic material without a nuclear envelope. The cell wall of bacteria and cyanobacteria is made up of peptidoglycan. Peptidoglycan is a polymer made up of sugars and amino acids. It is also called as murein. 
    Thus, the correct answer is 'Both B and C.'
  • Question 4
    1 / -0
    Lichen is an example of ___________.
    Solution
    Lichens are not a single organism, but, rather, an example of a mutualism in which a fungus usually a member of the Ascomycota or Basidiomycota phyla lives in close contact with a photosynthetic organism 
  • Question 5
    1 / -0
    Iron bacterium is
    Solution
    Thiobacillus is a Gram-negative bacterium. It basically oxidizes thiosulfate and elemental sulfur to sulfate. It is also called as Iron bacterium or Iron-oxidizing bacteria. It is a chemotrophic bacterium that obtains the energy by oxidizing dissolved ferrous iron.
    Thus, the correct answer is 'Thiobacillus.'
  • Question 6
    1 / -0
    In which of the following stage of Rhizopus 'n' number of chromosome is not found?
    Solution
    The zygospores are the only diploid phase (2n number of chromosomes) of Rhizopus reproduction. They are composed of two suspensor cells, which are the former gametangia or hyphae.
    So the correct answer is option A.
  • Question 7
    1 / -0
    Generally in laboratory cultures of Rhizopus, there is no formation of zygospore because :
    Solution

  • Question 8
    1 / -0
    In Rhizopus, we find white cottony mycelium which shows black spots during asexual reproduction. These spots are
    Solution
    • Rhizopus fungi are characterized by a body of branching mycelia composed of three types of hyphae: stolons, rhizoids, and usually unbranching sporangiophores. 
    • The black sporangia at the tips of the sporangiophores are rounded and produce numerous nonmotile multinucleate spores for asexual reproduction.
    So the correct answer is option D.
  • Question 9
    1 / -0
    Reindeer moss is a lichen named _______.
  • Question 10
    1 / -0
    Two micronuclei occur in _____________.
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