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Biological Classification Test - 71

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Biological Classification Test - 71
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Weekly Quiz Competition
  • Question 1
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    Which of the following animal phylum includes segmented worms?
    Solution
    Molluscs do not have segmentation in their bodies.
    Arthropoda has segmentation as a character but it does not include worms.
    Annelids is the phylum of the segmented worms.
    Some characteristics of Annelids are:
    1. Segmented bodies.
    2. Bilaterally symmetrical.
    3. First organisms with organ level classification.
    So the correct answer is 'Annelida'.
  • Question 2
    1 / -0
    Of the following, the two bacterias used in genetic engineering are
    Solution
    Escherichia and Agrobacterium are the two bacterias which are used in genetic engineering because of the presence of plasmids. Plasmids are self-replicating, extra-chromosomal segments of double-stranded, circular, naked DNA. Plasmids provide unique phenotypic characters to bacteria. They are independent of the main nucleoid. Some of them contain important genes like fertility factor, nif genes, resistance factors and colicinogenic factors. Plasmids are used as vectors in genetic engineering.
  • Question 3
    1 / -0
    A virus can be considered living as it
    Solution
    A virus is an organism that can be considered both living and non-living. It can be considered as living when it is inside any host (bacterium) as the virus infects the host cell and replicates inside it making several copies of it. When it is outside the host cell, it is non- living as it can not carry out its life- processes of either reproducing or digestion etc. 
  • Question 4
    1 / -0
    Neem is classified under
    Solution
    The answer is D. Angiosperms
    Azadirachta indica, commonly known as neem, is a tree in the mahogany family Meliaceae. It is mostly used for medicinal purposes. 
  • Question 5
    1 / -0
    Sea cucumber belongs to phylum 
    Solution
    Sea cucumber belongs to Echinodermata.
    Some characteristics of Echinodermata are:
    1. Radial symmetry
    2. Triploblastic
    3. Exclusively marine
    4. Presence of Exoskeleton
    So the correct answer is 'Echinodermata'.
  • Question 6
    1 / -0
    Peritrichous bacteria have flagella
    Solution
    Depending on the presence or absence of flagella, bacteria are grouped into flagellate and non-flagellate types. The various forms of flagellation are as follows:
    1. Atrichous: Flagella absent
    2. Monotrichous: A single flagellum occurs at or near one end of bacterium.
    3. Amphitrichous: A flagellum at each of the two ends.
    4. Cephalotrichous: A group or tuft of flagella is found at one end.
    5. Lophotrichous: A tuft or group of flagella at each of the two ends or poles.
    6. Peritrichous: A number of flagella are distributed all over the surface.
    Hence the correct option is C.
  • Question 7
    1 / -0
    Spirulina belongs to kingdom
    Solution
    Spirulina belongs to kingdom monera. It is a spirally coiled free floating filamentous blue green alga or cyanobacterium of upto 0.5 mm length. It can grow both autotrophically and heterotrophically. This cyanobacterium is rich in protein. It also contains minerals, vitamins and essential fatty acids. Because of its beneficial nature, Spirulina is used as food additive in the form of powder, pill or tablet. It is also used as manure. It is helpful in reclamation of usar soils.
  • Question 8
    1 / -0
    How many organisms in the list given are autotrophs Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Trypanosoma, Porphyra, Wolffia 
    Solution
    Autotrophs are organisms which are capable of synthesizing their food themselves from organic and inorganic substances. Out of the given examples, Nostoc, Chara, Porphyra and Wolffia are photsynthetic autotrophs and Nitrosomonas and Nitrobacter are chemosynthetic autotrophs. Trypanosoma is parasitic organism. Lactobacillus, Streptomyces are heterotrophs.
    Thus, the correct answer is option C.
  • Question 9
    1 / -0
    A free living anaerobic nitrogen fixer is
    Solution
    There are basically two types of nitrogen-fixing bacteria, free-living and symbiotic bacteria. Rhodospirillum is free-living, anaerobic nitrogen fixer. Both Beijerinckia and Azotobacter are free-living, aerobic nitrogen fixer. Rhizobium is a symbiotic, nitrogen fixer.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    Which one of the following is denitrifying bacteria?
    Solution
    Denitrifying bacteria are those microorganisms which convert nitrates present in the soil to free atmospheric nitrogen. They decrease the soil fertility and reduce agricultural productivity. For example, Thiobacillus denitrificans, Micrococcus denitrificans, Serratia, Pseudomonas, etc.
    Thus, the correct answer is option B.
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