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Microbes in Human Welfare Test - 30

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Microbes in Human Welfare Test - 30
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Pebrine disease is found in ...........
    Solution
    Pébrine is a disease of silkworms, which is caused by microsporidian parasites, mainly Nosema bombycis . The silkworm larvae infected by pebrine are usually covered in brown dots and are unable to spin silkworm thread. They cause the death of eggs or larva during their third moult. It is the worst disease of silkworms. 
    So, the correct answer is 'Silk moth'.
  • Question 2
    1 / -0
    Which of the following bacteria causes sorter's disease in sorter's?
    Solution
    Anthrax disease is caused by Bacillus anthracis. It causes cutaneous infection. This disease is common in dock workers who carry loads. The Rhizobium is fungi and the Clostridium coliform are bacteria related. 
    So the correct answer is 'Anthrax'.
  • Question 3
    1 / -0
    Penicillium camemberti is associated with
    Solution
    The certain fungal population is known as cheese moulds play an important role in the refining of cheese. They give the cheese a characteristic texture and flavour. The important kinds of mould refined cheese are - Camembert and Brie type and Roque fort gorgonzola and stilton type. These moulds concerned are Penicillium camemberti is the first type and Penicillium roqueforti is the second type. 
  • Question 4
    1 / -0
    Trichoderma harzianum has proved a useful microorganism for
    Solution
    Trichoderma harzianum is an effective biocontrol agent against several fungal soilborne plant pathogens. It is used for foliar application, seed treatment and soil treatment for suppression of various disease-causing fungal pathogens. These fungi are present in nearly all soils. In soil, they frequently are the most prevalent culturable fungi. Thus, the correct answer is option B.
  • Question 5
    1 / -0
    Which bacteria is utilized in a gober gas plant?
    Solution
    Biogas is an alternate source of energy produced by anaerobic breakdown or digestion of biomass such as animal excreta and kitchen wastes with the help of methanogenic bacteria or methanogens. Biogas is made up of methane (50-70%), carbon dioxide (30-40%) with traces of nitrogen, hydrogen sulphide and hydrogen. Biogas generation is a three-stage anaerobic digestion of animal and other organic wastes
    Thus, the correct answer is option A.
  • Question 6
    1 / -0
    Agriculturists have reported about 40-50% higher yields of rice by applying
    Solution
    In the atmosphere, nitrogen is present as diatomic stable gaseous form. This form of Nitrogen cannot be used by plants. Plants depend on Nitrogen present in Nitrogen compounds like nitrates, nitrites and ammonium form. These form of nitrogen are called as fixed form of nitrogen. 
    Azolla is an aquatic pteridophyte common in rice fields. This plant harbors Anabaena (cyanobacteria) in leaf pockets. The Anabaena present in leaf pockets fixes atmospheric nitrogen.
    So, the correct answer is option A.
  • Question 7
    1 / -0
    BGA is known as a best biofertilizer for
    Solution
    Blue-green algae or cyanobacteria are photoautotrophic, prokaryotic algae. They are free living nitrogen fixing microorganism. It fixes the atmospheric nitrogen in moist soils. So, BGA has been recommended as a biofertilizer for paddy field. 
  • Question 8
    1 / -0
    A green manure supplies
    Solution
    • Green manure acts mainly as soil acidifying matter to decrease the alkalinity/pH of alkali soils by generating humic acid and acetic acid. 
    • The root systems of some varieties of green manure grow deep in the soil and bring up nutrient resources unavailable to shallower-rooted crops.
    • Green manure also can help prevent soil erosion in areas with sandy soil, and help keep weeds from growing. 

    So, the correct answer is option D.
  • Question 9
    1 / -0
    Which of the following is a biofertilizer?
    Solution
    Blue-green algae like Nostoc, Anabaena fix atmospheric nitrogen and hence enhance soil fertility. Hence, these organisms are used as biofertilizers. Blue-green algae have special thick-walled cells, called as heterocysts, which carry on the process of fixation of atmospheric nitrogen.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Antibiotics inhibit the growth of or destroy
    Solution
    An antibiotic is a chemical substance produced by a microorganism that can kill  or inhibit the growth of other microorganisms such as bacteria and fungi and thus used to treat bacterial and fungal infections. It kills the bacteria by causing the cell walls to disintegrate. Thus, the correct answer is option A.
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