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Microbes in Human Welfare Test - 34

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Microbes in Human Welfare Test - 34
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following are biopesticides?
    Solution
    Biopesticides are those biological agents that are used for the control of weeds, insects and pathogens. examples of biopesticide are as follows-
    a) Nicotine- tobacco
    b) Azadirachtin- neem
  • Question 2
    1 / -0
    Which of these is not a key factor that helps in the process of decay?
    Solution
    Decay is what happens when dead animals and plants break down. The key factors involved in decay are: Temperature, Amount of oxygen, Amount of water and the presence of microorganisms. Microorganisms are important in decay. For example, they are used to break down human waste (sewage) and plant waste (compost). Decay recycles important nutrients for plant growth.
  • Question 3
    1 / -0
    Mixture of biogas contains
    Solution

    Biogas consists primarily of methane (the source of energy within the fuel) and carbon dioxide. It also may contain small amounts of nitrogen or hydrogen. Contaminants in the biogas can include sulphur or siloxanes but this will depend upon the digester feedstock.

  • Question 4
    1 / -0
    Scirpophaga incertulas is an example of
    Solution
    Monophagous pests are those insects, which are known to feed on only a single species of plants. For example, Scirpophaga incertulas.
  • Question 5
    1 / -0
    Which of the following shows a modern technology measure used to preserve and conserve the environment?
    Solution
    There are various different methods which are used for the conservation of and healthy environment. The most modern method is conversion of the biological wastes from plants and animals into useful product like biogas. The organic matter from the plants and animals which act as wastes in the form of degradable matter are used in this process. Anaerobic bacteria perform anaerobic fermentation and convert this wastes into biogas. Biogas is commonly used as fuel because of high amount of methane. Methane serves as a clean and non-polluting fuel. 
    Thus, the correct answer is option D. 
  • Question 6
    1 / -0
    What does gobar gas produced from animal and plant waste contain?
    Solution
    Biogas is also commonly known as gobar gas. The biogas is produced due to anaerobic decomposition of the organic waste matter from the plants and animals with the help of microorganisms. The composition of biogas is methane and carbon dioxide. There are traces of hydrogen, nitrogen, hydrogen sulphide and carbon monoxide. The major component is of methane which accounts for 50-70%. Methane forms the clear and non-polluting gas and commonly used as a fuel.
    Thus, the correct answer is option B.  
  • Question 7
    1 / -0

    Which of the following produces citric acid through the process of fermentation?

    Solution
    • Aspergillus produces citric acid through fermentation process.
    • Streptococcus  produces lactic acid through fermentation.
    • Acetobacter produces acetic acid through fermentation.
    • Streptomyces produces antibiotics.
    • So, the correct answer is 'Aspergillus'.
  • Question 8
    1 / -0
    Name the scientist who reported the discovery of microorganisms.
    Solution
    The greatest contribution came from Antonie van Leeuwenhoek who discovered red blood cells and spermatozoa and helped to popularize microscopy as a technique. On 9 October 1676, Van Leeuwenhoek reported the discovery of micro-organisms. 
    So, the correct answer is option A.
  • Question 9
    1 / -0
    Which of the following is formed during the process of anaerobic fermentation?
    Solution
    Biogas is also commonly known as gobar gas. The biogas is produced due to the decomposition of the organic waste matter with the help of microorganisms in the absence of oxygen. This process is known as anaerobic fermentation. There are four steps required for the production of biogas as hydrolysis, acidification, acetation and methane formation. Anaerobic bacteria are involved in this processes. The composition of biogas is methane and carbon dioxide. There are traces of hydrogen, nitrogen, hydrogen sulphide and carbon monoxide. 
    Thus, the correct answer is option A.  
  • Question 10
    1 / -0
    Sour cream is produced by 
    Solution
    Sour cream is the cream which is prepared by fermentation of the cream by certain species of bacteria. Sterptococcus lactis and Leuconostoc cremoris are the species of bacteria which are most commonly used for the preparation of sour cream. These bacterium perform lactic acid fermentation. The fermentable sugar present in milk or cream is lactose. The lactose sugar is fermented to form lactic acid which gives the sour taste. 
    Thus, the correct answer is option D. 
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