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Microbes in Human Welfare Test - 54

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Microbes in Human Welfare Test - 54
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  • Question 1
    1 / -0
    Citric acid used in the production of beverages, toffees, chocolates is obtained by fermentation of _______ by Aspergillus niger.
    Solution
    Answer is option B i.e. "Sugar molasses"
    Citric acid production is by solid state fermentation. Submerged fermentation is the process which is used for the production of citric acid. The substrate or media used for citric acid production is carbohydrate, mainly sugar molasses along with starch.
  • Question 2
    1 / -0
    How is the lactic acid fermentation used in milk industry?
    Solution
    • Lactobacillus bacteria cause the fermentation of milk in which milk sugar lactose is converted into lactic acid. This produces yoghurt and curd.
    • Lactobacillus is acidophiles that best grow at a pH of 1 to 5.4. 
    • Thus the correct answer is option A. 
  • Question 3
    1 / -0
    Which one of the following is not used as biofertilizer?
    Solution
    A. Bacillus thuringiensis
    EXPLANATION: Bacillus thuringiensis is a gram-positive spore-forming soil microorganism. The toxin produced by Bacillus thuringiensis has been used as an insecticide spray since 1920s and is commonly used in organic farming.
    So the correct answer is option A.
  • Question 4
    1 / -0
    How many of the following organisms can be used as biofertilizers?
    Azolla, Thiobacillus, Frankia, Glomus, Pseudomonas, Anthoceros, Klebsiella.
  • Question 5
    1 / -0
    Benzo-diazepene is an?
  • Question 6
    1 / -0
    Match the contents of Column-I with of Column-II.

    		Colum-I
    		Column-II
    AMonascus purpurensiStatins
    BAspergillus nigeriiCyclosporin-A
    CTrichoderma polysporumiiiCitric acid
    Solution
    B. A-i, B-iii, C-ii
    Solution : Aspergillus niger is used in industrial production of citric acid and Trichoderma produces cyclosporin-A used as an immunosuppressant and statins produced by Monascus purpureus is a drug to lower cholesterol.
    So the correct answer is "A-i, B-iii, C-ii".
  • Question 7
    1 / -0
    Natural killer(NK) cells can destroy.
  • Question 8
    1 / -0
    Which one is the most important role of microorganisms for the well being of humans?
    Solution
    Answer is option C i.e. "Conversion of milk to curd"
    Microorganisms help in the production of many food items, making medicines, keeping the environment clean, in manufacturing and in research. 
    Conversion of milk to curd is the considered as an important role in the micro organism for the well being of humans. . Bacteria like Lactobacillus can be used to make curd from milk by process of fermentation.
  • Question 9
    1 / -0
    Which of the following is a function of Rhizobium?
  • Question 10
    1 / -0
    Which of the following is the pair of biofertilisers?
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