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Microbes in Human Welfare Test - 67

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Microbes in Human Welfare Test - 67
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is widely used as a successful biofertiliser in Indian rice fields?
    Solution
    Azolla pinnate is a small free-floating freshwater fern which is widely used as a biofertiliser in Indian rice fields. So, the correct answer is D.
  • Question 2
    1 / -0
    Study the following statements and select the correct ones.

    (i) Methanogens are archaebacteria that produce methane in marshy areas.
    (ii) Nostoc is a filamentous blue-green alga that fixes atmospheric nitrogen.
    (iii) Many members of the genus Glomus form mycorrhiza.
    Solution
    1. Methanogens are archaebacteria belong to the domain of archaea, commonly found in wet, marshy areas,  They produce methane gas.
    2. Nostoc is the filamentous blue-green alga. They form gelatin body which contains trichomes.
    3. Glomus and it's all species form symbiotic relationships (mycorrhizas) with plant roots. 
    So the correct answer is option D.
  • Question 3
    1 / -0
    The product of which of the following organisms has been commercialized as blood cholesterol lowering agent is?
  • Question 4
    1 / -0
    Which of the following plants can act as a biofertilizer
    Solution
    Nostoc belongs to cyanobacteria genus, and it can be used as biofertilizer. It is also called the blue-green algae. Nostoc converts atmospheric nitrogen into ammonia, which can be further converted to a suitable form for plant growth. Biofertilizers enhance the quality of plants and soil.
    So the correct answer is 'Nostoc'.
  • Question 5
    1 / -0
    Nif - genes are introduced in 
    Solution
    Nif-genes are the genes encoding enzymes involved in the fixation of atmospheric nitrogen available to the leguminous plants. The nif-genes are found in both free-living nitrogen-fixing bacteria and in symbiotic bacteria associated bacteria. These genes are introduced from legume plants into cultivated plants.
    So, the correct option is 'Nicotiana'
  • Question 6
    1 / -0
    Which of the following pairs is wrongly matched?
    Solution
    Xanthomonas campestris is an aerobic, gram-negative rod known to cause the black in crucifers by darkening the vascular tissues. Host-associated, over 20 different pathovars of V.Campestris have been identified by their distinctive pathogenicity on a wide range of plants including crops and wild plants.
    So, the correct option is 'Biopesticide: Xanthomous campestris'.
  • Question 7
    1 / -0
    Cellulases and hemicellulases arc in great demand nowadays for the preparation of second-generation:
    Solution
    Lignocellulose, a major component of plant biomass produced through photosynthesis, is abundant, sustainable and renewable. Therefore, it is no surprise that lignocellulosic bioenergy has become a subject of intense investigation. In comparison to fossil fuels, lignocellulosic biofuel offers many advantages: it is renewable and environmentally friendly; it has potential to mitigate global warming; it can prevent a fuel shortage and it has no effect in the food chain. One of the processes studied for obtaining the highest potential of sugars for the production of biofuel is the enzymatic hydrolysis of lignocellulosic wastes, using cellulases and hemicellulases.

    So, the correct answer is 'biodiesel'.
  • Question 8
    1 / -0
    Identify the odd one out ?
    Solution

    Correct Answer: B

    Explanation:

    • In the given group of Lactobacilli, Rhizobia, Yeast, and Clostridia, Clostridia is an odd one because it is a major cause of food poisoning while other microbes are beneficial. 
    • Lactobacilli is useful in curding.
    • Rhizobia is a symbiont with legumes that helps to fix nitrogen.
    • The yeast is used to makes alcohol and brought about the fermentation of the dough.

    So, the correct answer is 'Lactobacilli, Rhizobia, Yeast, Clostridia'.

  • Question 9
    1 / -0
    Which one of the following is wrong statement?
    Solution
    • Anabaena and Nostoc are also free-living nitrogen fixers.
    • Root nodule forming nitrogen fixers enzyme (nitrogenase) works only under the anaerobic condition.
    • Phosphorus is a constituent of cell membranes as a phospholipid, in nucleic acid as phosphate group and proteins are rich in phosphorus.
    • Nitrosomonas and Nitrobacter play an important role in nitrification. They are chemoautotrophs. 
    • So the correct answer is 'Root nodule forming nitrogen fixers live as aerobes under free-living conditions'.
  • Question 10
    1 / -0
    The microbial biofertilizers which can act both symbiotically and non-symbiotically to increases soil fertility are?
    Solution
    Azobacter is a free-living nitrogen-fixing bacterium, which is used as a biofertilizer is the cultivation of most crops. Azobacter is usually motile, oval, or spherical bacteria, form thick-walled cysts and may produce large quantities of capsular time.
    So, the correct option is 'Azobacter'.
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