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Microbes in Human Welfare Test - 38

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Microbes in Human Welfare Test - 38
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  • Question 1
    1 / -0
    Purified antibiotic penicillin of Penicillium notatum was obtained by :
    Solution

  • Question 2
    1 / -0
    Biofertiliser for Soya bean crop is
    Solution
    (A)Rhizobia are bacteria that fix nitrogen after becoming established inside root nodules of legume. It is a biofertilizer for soya bean crop.
    (B)Nostoc is a genus of cyanobacterium found in the environment that forms colonies composed of filaments in a gelatinous sheath.
    (C)Azobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime.
    (D)Azospirillium is a gram-negative microaerophilic and nitrogen-fixing bacteria.
    So, the correct option is 'Rhizobium'.
  • Question 3
    1 / -0
    Yeast is important source of :
    Solution

  • Question 4
    1 / -0
    Fertility of paddy fields is improved by addition of
    Solution
    • Blue green algae such as Nostoc , Anabaena etc  are very good at fixing nitrogen in the soil. They grow in symbiotic association with the roots of plant forming a legume where nitrogen fixation for the plant takes place.
    • Using blue green algae to provide the plant and the soil with nitrogen is an effective way of increasing production of plant along with soil fertility.
    • The heterocyst present in the blue green algae bring about nitrogen fixation  
    • so, the correct answer is 'Blue-Green Algae'
  • Question 5
    1 / -0
    Bacteria responsible for fermentation of dairy milk are
    Solution
    The most common bacteria responsible for fermentation of dairy milk are Lactobacillus species. Bacteria like Lactococcus and Leuconostoc are also used in production of fermented milk products. Lactobacillus produce lactic acid from lactose by the process of glucose fermentation. This also increases acidity and sours and thickens the milk.
    Thus, the correct answer is 'Lactobacillus.'
  • Question 6
    1 / -0
    Ashbya gossypii  is a ________________.
    Solution

  • Question 7
    1 / -0
    Antihaemorrhagic ergot alkaloids are got from _________.
    Solution

  • Question 8
    1 / -0
    Azolla is used as a biofertilizer because it
    Solution
    Biofertilizers are the organism that enriches the nutrient quality of the soil. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. Azolla is water fern which is also used as a biofertilizer. There are around 80,000 symbiotic cyanobacteria present on its leaves. Symbiotic cyanobacteria Anabaena Azollae is responsible for nitrogen-fixation which increases the fertility of the soil and in turn enhances the yield. Azolla pinnata, a pteridophyte, is used as an excellent fertilizer in rice field.
  • Question 9
    1 / -0
    If the nitrogenase enzyme has been inactivated by radiation, there will be no _________.
    Solution
    If by radiation all nitrogenase enzyme is inactivated, then there will be no fixation of nitrogen in legumes. The enzyme nitrogenase is necessary for biological nitrogen fixation only. If it gets inactivated by radiation, the process of biological nitrogen fixation will get affected. Nitrogen fixation occurs through other ways also. So either phenomenon of nitrogen fixation will not stop by the absence of nitrogenase enzyme. Neither conversion of ammonium to nitrate (nitrification) nor conversion of nitrate to nitrite require nitrogenase. Hence they will not get affected.
    So, the correct option is 'B'.
  • Question 10
    1 / -0
    Azolla is useful as green manure for
    Solution
    Azolla belongs to the family of Salviniaceae. It is an aquatic fern which remains in symbiotic association with the Anabena and helps in fixation of nitrogen. It provides the cyanobacteria with a safe environment in exchange for nitrogen. It is used as a green manure during cultivation of rice to increase the efficiency of rice.
    So, the correct answer is option B.
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