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Biological Classification Test - 55

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Biological Classification Test - 55
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which one belongs to monera?
    Solution
    Monera kingdom consists of unicellular prokaryotic organisms. It includes bacteria like Escherichia, Cyanobacteria (Blue green algae). They lack membrane-bound organelles. They also have genetic material without nuclear envelope. Hence, they do not contain true nucleus.
    Thus, the correct answer is 'Escherichia.'
  • Question 2
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    Bacteria living in the human large intestine, that feed on undigested food without harming the host are termed as
    Solution
    • Commensals are organisms that get benefit from the host and in return, the host is neither benefited nor harmed. Bacteria living in the human large intestine that feed on undigested food without harming the host are termed as commensals.
    • Predators are those organisms which kill the host to obtain food.
    • Symbionts are those organisms in which both the partners are benefited from each other.
    • Parasites are those organisms which obtain resources from only one host and in return, the host is harmed. 
    Thus, the correct answer is 'Commensals.'
  • Question 3
    1 / -0
    Which type of organisms has the largest population on the earth?
    Solution
    The micro-organism which has the largest population on the earth is bacteria.
    Bacteria are the sole members of the kingdom Monera and are found almost everywhere.
    Bacteria are most abundant micro-organisms on the earth as they are not only found everywhere but they also live in extreme habitats such as hot springs, deserts, snow and deep oceans where very few other life forms can survive.
    Many of the bacteria also live in or on other organisms as parasites, symbionts and commensals.
  • Question 4
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    Some bacteria produce resting spores during unfavourable conditions. They are
    Solution
    Some bacteria produce resting spores during unfavourable conditions. They are called as endospores. These are asexual spores. When favourable conditions return, they start reproducing. Examples of bacteria producing endospores include Bacillus and Clostridium.
    Thus, the correct answer is 'Endospores.'
  • Question 5
    1 / -0
    Which of the following is a good example of heterothallism?
    Solution
    • Rhizopus stolonifer is also known as black bread mold. It is a widely distributed thread-like mucoralean mold. 
    • It is a heterothallic species, in that sexual reproduction happens only when opposite mating types come in contact. 
    • Successful mating results in the formation of durable zygospores at the point of contact. 
    • So, the correct answer is option B.
  • Question 6
    1 / -0
    In endomycorrhiza, the fungus is commonly
    Solution

    Endomycorrhiza is the fungus that penetrates and develops inside roots of plants.  

    Zygomycete is the commonly found fungus in endomycorrhiza, also called as pin moulds. 

    Phycomycete are saprophytic in nature. 

    Ascomycetes and basidiomycetes are ectomycorrhizae,  Ascomycetes are mainly found in marine habitats. 

    Basidiomycete are mainly found on dead tree trunks.

    The correct answer is A.

  • Question 7
    1 / -0
    Thick walled asexual spores formed by Rhizopus are
    Solution

    Chlamydospores are the large thick-walled resting spores found in Rhizopus during asexual reproduction. Aplanospores are the non-motile spores due to absence of flagella. Akinetes are the thick-walled spore of cyanobacteria.

    The correct answer is D.

  • Question 8
    1 / -0
    The zygospores of Rhizopus contain a high amount of fat globules. It is thick walled and the colour is
    Solution

    • Zygospore is produced by the fusion of two gametangia and is black in colour.
    • It has a thick wall to protect it from environmental conditions. 
    • It contains a high amount of fat globules for developing zygospore. Lately, zygospore germinates undergoing meiosis.
    • The correct answer is D.

  • Question 9
    1 / -0
    The common mode of reproduction in Rhizopus is by
    Solution
    Rhizopus species grow as filamentous, branching hyphae that generally lack cross-walls. They reproduce by forming asexual and sexual spores. In asexual reproduction, sporangiospores are produced inside a spherical or bulb like structure, the sporangium.
    So, the correct answer is 'Sporangiospores'
  • Question 10
    1 / -0
    Rickettsia constitute a group under
    Solution
    • Rickettsia is a group of bacteria that are obligate intracellular parasites. 
    • They are considered a separate group of bacteria as they are spread arthropod vectors.
    • They have a mucopeptide cell wall with DNA as genetic material and are independent entities causing diseases like Q-fever, typhus, etc.
    Thus, the correct answer is  option C
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