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Biological Classification Test - 30

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Biological Classification Test - 30
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The scientific name of red bread mould is
    Solution
    Neurospora crassa is an ascomycete, the red bread mould. A fungus growing in the form of a filamentous structure called as hypha with a reddish colour at some stage of its life. N. crassa is used as a model organism because it is easy to grow and has a haploid life cycle that makes genetic analysis simple since, recessive traits will show up in the offspring.
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    Bacterium, Escherichia coli have flagella around the periphery of the cell. This condition is known as
    Solution
    A flagellum is a lash - like appendage, that protrudes from the cell body of certain prokaryotic and eukaryotic cells. The primary role of the flagellum is locomotion, but it also often has function as a sensory organelle, being sensitive to chemicals and temperatures outside the cell. Peritrichous bacteria have flagella projecting in all directions (e.g., E. coli).
    Hence the correct option is A.
  • Question 3
    1 / -0
    Gametangial copulation is characteristic to
    Solution
    Direct fusion of certain fungal gametangia without differentiation of the gametes is called gametangial copulation. Sexual reproduction is by gametangial copulation and complete fusion of protoplasts of two gametangia results in the formation of a zygospore. It is a characteristic feature of Zygomycetes. 
    So, the correct answer is option B.
  • Question 4
    1 / -0
    In some viruses, RNA is present instead of DNA indicating that
    Solution
    An RNA virus is a virus that has RNA (ribonucleic acid) as its genetic material. This nucleic acid is usually single-stranded RNA (ssRNA), but may be double-stranded RNA (dsRNA). In some viruses, RNA is present instead of DNA indicating that RNA can act to transfer heredity. They use RNA to transfer genetic information. Thus, option C is correct.
  • Question 5
    1 / -0
    Which of these is a bioindicator?
    Solution
    The hardy lichens are useful bioindicators of air pollution, especially sulfur dioxide pollution since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil. 
  • Question 6
    1 / -0
    Multicellular eukaryotic decomposers belong to 
    Solution
    A. Kingdom Animalia includes the multicellular organisms having eukaryotic cells with the heterotrophic mode of nutrition.
    B. Kingdom Protista includes unicellular or colonial unicellular eukaryotic organisms which are mostly aquatic while the mode of nutrition can be autotrophic or heterotrophic.
    C. Kingdom Fungi includes the multicellular eukaryotic heterotrophic organisms which are generally parasites and saprophytes.
    D. Kingdom Plantae includes multicellular and photoautotrophic organisms which grow indefinitely.
    Since decomposers are saprophytes, as they feed on dead and decaying matter, so they belong to Kingdom fungi.

    So, the correct answer is 'Kingdom Fungi'.
  • Question 7
    1 / -0
    The common bread black mould is
    Solution
    Rhizopus stolonifer is more commonly known as 'black bread mold'. Rhizopus specifically means any rot causing fungi. This type of mold also has a synonym of Rhizopus nigricans.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    The fungus is ................. , if it is parastic and requires two hosts for completion of its lifecycle.
    Solution
    • The fungus is heteroecious, if it is parastic and requires two hosts for completion of its lifecycle.
    • Most parasitic fungi are autoecious except rust, Puccinia which is heteroecious, as it requires two hosts for completion of its life cycle, i.e., wheat (primary host) and barberry (secondary host).
    • On the other hand, an autoecious parasite completes its life cycle on a single host species. 
    Thus, the correct answer is option C.
  • Question 9
    1 / -0
    A bacteria with single flagella on opposite ends is called:
    Solution
    A flagellum is a locomotory organ that is also used as a sensory organ. The bacterial flagellum is made up of the protein flagellin. A single flagellum that can extend from both ends of the cell is called amphitrichous.
    So, the correct answer is option B.

  • Question 10
    1 / -0
    A structurally complete virus is called
    Solution
    • Viruses are acellular structure and are composed of rigid protein shell (capsid) surrounding nucleic acid (ss or ds RNA or DNA). 
    • Viroids are the smaller infectious pathogens that consist of only nucleic acid and no protein coat. Thus, a virus without its protein coat is termed a viroid. 
    • The complete, infective form of a virus outside a host cell, with a core of RNA or DNA and a capsid, is known as Virion.
    • Integration of genome of temperate phage with that of host DNA leads to the formation of the provirus. 
    Thus, the correct answer is option B.
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