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Biological Classification Test - 56

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Biological Classification Test - 56
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  • Question 1
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    Endospores develop in
    Solution
    Some bacteria produce resting spores during unfavorable conditions. They are called as endospores. These are asexual spores. When favorable conditions return, they start reproducing. Examples of bacteria producing endospores include Bacillus and Clostridium.
    Thus, the correct answer is 'Bacillus and Clostridium.'
  • Question 2
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    In yeast, the sexual reproduction is by conjugation. After fusion the zygotic nucleus divides meiotically and forms haploid spores. The unicellular structure with haploid spores is
    Solution
    Yeasts can also reproduce sexually by means of sexual spores called ascospores which result from the fusion of the nuclei from two cells followed by meiosis. These ascospores stay within a unicellular structure known as an ascus. Each ascus bear 4 ascospores.
    So the correct answer is option C.
  • Question 3
    1 / -0
    Sometimes in yeast the conjugation takes place between a parent cell and a bud. It is called
    Solution
    In some yeast e.g., Zygosaccharomyces chevalieri, the mother and daughter cells fuse to form the zygote and this phenomenon is called pedogamy.
    So, the correct answer is 'Pedogamy'
  • Question 4
    1 / -0
    The gametes in Rhizopus develop in specially formed cells known as
    Solution

    • Rhizopus reproduces sexually by the process of conjugation, wherein different types of strains  (bearing gametes in gametangia) come together and fuses to form zygospore. 
    • On the other hand in Rhizopus, suspensor cells provide support to zygospore, progametangia are the developing gametangia and antheridia are the male and female sex organs of Rhizopus.  
    • The correct answer is C.

  • Question 5
    1 / -0
    In Penicillium, asexual reproduction takes place by
    Solution
    Asexual reproduction takes place by unicellular, uninucleate, nonmotile spores, the conidia formed on conidiophore. The conidiophore may be unbranched.
    So, the correct answer is 'Conidia'
  • Question 6
    1 / -0
    In Penicillium, the mycelium bears sex organs. The male organ is called antheridium while the female one is known as:
    Solution
    Penicillium can be either homothallic (male and female sex organs in the same thallus) or heterothallic (male and female sex organs present on different thallus). The female sex organ is ascogonium, while the male one is referred to as antheridium.
    So the correct answer is option C.
  • Question 7
    1 / -0
    Zygospore of Mucor/Rhizopus germinates to form 
    Solution
    During sexual reproduction of Mucor/ Rhizopus, compatible strains form short, specialized hyphae called gametangia. At the point where two complementary gametangia fuse, a thick-walled, spherical zygosporangium develops. The zygosporangium typically contains a single zygospore. They may germinate to form hyphae or a sporangium.
    So the correct answer is option C.
  • Question 8
    1 / -0
    An organism without true nucleus is
    Solution
    Prokaryotes are organisms which are unicellular and lack a true nucleus. In these organisms, the nuclear membrane is not bound by a nuclear envelope. The genetic material is called as the nucleoid. They also lack membrane-bound organelles. Examples of prokaryotes include bacteria, Cyanobacteria (Blue-Green Algae), Archaebacteria. 
    Thus, the correct answer is 'All of the above.'
  • Question 9
    1 / -0
    Which of the following is the characteristic of Nostoc? 
    Solution
    Nostoc is a genus of Blue-green algae or Cyanobacteria. It is unicellular organism. It has as characteristic non-cellulosic cell wall made up of mureins are pseudomureins. It contains phycocyanin, phycoerythrin and chlorophyll a pigements. It reproduce asexually by fragmentation. 
    Thus, the correct answer is 'Non-cellulosic cell wall.'
  • Question 10
    1 / -0
    Which one is found in alimentary canal of humans?
    Solution
    Escherichia coli (E. coli) is a bacteria that commonly lives in the alimentary canal of of warm-blooded organisms like animal and human. Most strains of E. coli are harmless and they are the part of the normal flora of gut. They live in symbiotic association. However, certain strains of E. coli may cause cramps, discomfort and food poisoning.
    Thus, the correct answer is 'Escherichia coli.'
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