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Microbes in Human Welfare Test - 18

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Microbes in Human Welfare Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which one of the following is a free-living obligate anaerobic bacterium?
  • Question 2
    1 / -0
    The major gas in biogas production is ___________.
  • Question 3
    1 / -0
    The nutritive medium for growing bacteria and many fungi in laboratory is called 
    Solution
    The nutritive medium for growing bacteria and many fungi in laboratory is called Culture media. 
    Example, Skoog's medium
    So, the correct option is 'Culture media'
  • Question 4
    1 / -0
    A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as:
    Solution
    A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called activated sludge treatment .
    So, the correct option is 'activated sludge treatment'
  • Question 5
    1 / -0
    Statement 1 : Biocontrol refers to the use of biological methods for controlling plant diseases and pests.
    Statement 2 : Use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.
    Solution
    Biocontrol refers to the use of biological methods for controlling plant diseases and pests. Use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.
    So, the correct option is 'Both statements 1 and 2 are correct'
  • Question 6
    1 / -0
    Biofertilisers are the living organisms which. 
    Solution
     Biofertilisers are living micro organisms which bring about soil nutrient enrichment, maximise the ecological benefits, minimise the environmental hazards.
     So, the correct option is 'all of these'
  • Question 7
    1 / -0
    Sewage water can be purified for recycling with the action of
    Solution
    • Sewage pollution can be prevented by treating sewage before passing into the watercourse, in sewage or effluent treatment plants (ETP). 
    • The sewage is treated in ETP in three stages. 
    • Stage one is Primary Treatment which comprises physical processes like sedimentation. 
    • The second stage is aerobic and anaerobic biological degradation by microorganisms. 
    • The last or tertiary stage is physicochemical degradation for removing turbidity and dissolved substances.

    So, the correct answer is option C.
  • Question 8
    1 / -0
    First antibiotic discovered was ____________.
    Solution
    The first antibiotic discovered was penicillin. It was discovered in 1928 by Alexander Fleming when he noticed the growth of mould-fungi in the culture of Staphylococcus and there were no bacteria in the region where the fungi were growing. It was because the fungi were secreting the chemical that had killed the bacterial cells in the culture. The fungus was recognized as Penicillium.
    Hence, the correct answer is 'Penicillin'.
  • Question 9
    1 / -0
    Azolla is used as a biofertilizer because 
    Solution
    • Azolla is used as a biofertilizer and it is known to contribute 40-60 kg N/ha per crop. 
    • Azolla is a pteridophyte and is used as a biofertilizer because it has association with nitrogen-fixing cyanobacteria Anabaena azollae.
    • Azolla-Anabaena symbiotic system is the main biofertilizer inoculated in rice fields in South-Eastern Asia to increase yield up to 50%.

    So, the correct answer is option C.
  • Question 10
    1 / -0
    "Dodder" can transmit
    Solution
    In 1940 Bennett discovered that a virus could be transmitted from an infected to a healthy plant through bridging dodder that was parasitizing both plants. It has long been known that dodder haustoria establish cellular connections with the host plant.
    Parasitic plant like dodder is used as conduct either for the transmission of viruses or mycoplasma from a host plant to a plant, that is not typically a host or for an agent, that is not graft-transmissible.
    So, the correct answer is 'Both A and B'.
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