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Environmental Issues Test - 54

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Environmental Issues Test - 54
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Weekly Quiz Competition
  • Question 1
    1 / -0
    One of the most polluted river in Maharashtra is
    Solution
    • Maharashtra has the most polluted rivers in India. After Maharashtra, Gujarat has the most polluted rivers. 
    • Some of the most polluted rivers are Vena, Godavari, Bhima, Krishna, Tapi, Panchganga, Mithi, Vaitarna, and Wardha. 
    • Out of all these rivers, Panchaganga is the most polluted river in Maharashtra which is near the industrial belts of Raigad district. 
    • Industrial waste and effluent discharge have polluted Panchaganga river and turned the water green. 
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Most abundant water pollutant is
    Solution
    Detergents, oil spills, pesticides, industrial waste, all these are water pollutants but industrial waste is the most abundant water pollutants.
  • Question 3
    1 / -0
    Which of the option shows following examples in ascending order in terms of BOD?
    (i) Distilled water (ii) Tap water(iii) Sewage wastes drained in river
    Solution
    BOD is the oxygen required by microorganisms to metabolise organic wastes in the water. Biological treatment of wastewater will reduce the organic impurities or an organic load of polluted water, thus curtail the level of BOD. The greater the content of organic waste in the water greater will be the BOD. Organic waste will be maximum in the sewage waste. Hence it will have the highest BOD. Thus the correct answer is option B.
  • Question 4
    1 / -0
    Deforestation does not lead to
    Solution
    Deforestation leads to soil erosion, alteration of local weather conditions, destruction of natural habitat of wild animals, but it does not lead quick nutrient cycling
    So, the correct answer is 'Quick nutrient cycling'
  • Question 5
    1 / -0
    Deforestation is the major causal agent of
    Solution
    Deforestation leads to erosion of top fertile layer of the soil, it also depletes the soil of decomposing microorganisms and thus humus. Absence of humus makes the soil dry i.e, its water holding capacity is decreases. So no vegetation grows in the soil, further depleting the condition of the soil leading to desert like condition. Hence, also called desertification
    So, the correct answer is 'Desertification of habitat'
  • Question 6
    1 / -0
    Products of organic farming are preferred because they are
    Solution
    • Organic foods or products are preferred because it has high nutritional value than conventional food. 
    • The reason for this is the absence of pesticides & fertilizers.  
    • In the absence of these, the plants boost their production of phytochemicals that strengthen their resistance to bugs and weeds.

    So the correct option is ' Free from pollutants '.
  • Question 7
    1 / -0
    Instead of fertilizers, organic farming uses
    Solution
    To overcome the problems associated with the overuse of chemical fertilizers ,the farmers have now switched to organic farming . It is the process of use of natural methods like bio-fertilizer , manure , vermicompost & crop rotation etc.
    So the correct option is ' All of the above ' .
  • Question 8
    1 / -0
    Who introduced the concept of organic farming?
    Solution
    • The use of animal manures (often made into compost), cover crops, crop rotation, and biologically based pest controls resulted in a better farming system. 
    • This was observed by Sir Albert Howard, F.H. King, and Rudolf Steiner in the early 1900s and the concepts of organic agriculture was developed.

    So, the correct answer is option D.
  • Question 9
    1 / -0
    The pesticides used in organic farming are
    Solution
    Margosa, nicotine and pyrethrum are natural pesticides obtained from neem, tobacco plants and chrysanthemum plants respectively.
    Carbonates and organochlorides are pesticides that are manufactured using chemicals.
    So the correct option is.
  • Question 10
    1 / -0
    Continous exposure to electromagentic radiations affects human systems through
    Solution

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