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Environmental Issues Test - 55

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Environmental Issues Test - 55
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Study the lists and find the correct match.
    III
    (a)BOD(i)Treatment of sewage
    (b)KVIC(ii)Measure of organic matter in water
    (c)LAB(iii)Biological methods for controlling plant diseases
    (d)STPS(iv)Increases vitamin B$$_{12}$$
    (v)Production of biogas
    Solution
    BOD-Biological oxygen demand is the measure of organic matter in water
    KVIC-Khadi and Village Industries Commission helps in production of biogas
    LAB-Lactic acid bacteria in milk help in increasing vit B12 .
    STPS-Sewagw treatment plants are used for treatment of sewage.
    Correct answer-D
  • Question 2
    1 / -0
    Organic farming does not employ
    Solution

    Organic farming is a method of crop and livestock production that involves much more than choosing not to use pesticides, fertilizers, genetically modified organisms, antibiotics and growth hormones. An agrochemical is a chemical product used in agriculture. In most cases, agrochemical refers to pesticides including insecticides, herbicides, fungicides and nematicides. Hence, agrochemicals are not used in organic farming because of their chemical nature .
    So the correct option is ' Agrochemicals ' .

  • Question 3
    1 / -0
    Hatchlings grown in nursery ponds form :
  • Question 4
    1 / -0
    Forest destruction results in
    Solution
    Forest destruction i.e. deforestation has many after effects, it leads to soil erosion, loss of habitat, etiction of wildlife, floods & drought conditions.
    So, the correct option is 'All the above'.
  • Question 5
    1 / -0
    ODS means
    Solution
    ODS refers to the ozone-depleting substances like chlorofluorocarbons, methyl bromide, methyl chloroform, carbon tetrachloride, hexaflurocarbons that release the chlorine and oxides of chlorine. These react with the UV rays and ozone to release the nascent oxygen. 
    Hence, the correct answer is 'Ozone Depleting Substances'
  • Question 6
    1 / -0
    Planting of trees, shrubs and others in between crop plants for stabilisation of soil is
    Solution
    • Agroforestry is the planting of trees, shrubs, and others in between crop plants.
    • Advantages of agroforestry practices include Increased crop production and economic gain. Soil conservation and improved soil quality. Sequestration of atmospheric carbon.
    • Hence Planting of trees, shrubs, and others in between crop plants for stabilization of soil is Agroforestry.
    • So, the correct answer is 'Agroforestry'.
  • Question 7
    1 / -0
    At DO below $$4$$ mg/$$l$$, water at normal temperature is considered as
    Solution
    Dissolved oxygen (DO) refers to the amount of oxygen dissolved in the water. It depends on the following factors:
    1. Temperature- colder the temperature, more will be the DO.
    2. Pressure- greater the pressure, more will be the DO.
    3. Salinity- lower the salinity, more will be the DO.
    The levels of DO below 5mg/l is considered to be hazardous to the aquatic lives. At normal temperature, any water body showing less DO than 5mg/l will be highly polluted.
    Hence, the correct answer is 'Heavily Polluted'
  • Question 8
    1 / -0
    Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution. These industries discharge harmful chemicals into rivers and streams and pollute water. The chemicals released include ________.
    Solution
    Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution.These industries discharge harmful chemicals into revers and streams, and pollute water. The chemicals released include arsenic, lead and fluorides which lead to toxicity in plants and animals.
  • Question 9
    1 / -0
    Pollutant likely to deplete ozone layer is?
    Solution
    • Nitrous oxide is stable at ground level and breaks down when it reaches the stratosphere to form nitrogen oxides, that trigger ozone-destruction. 
    • The main cause of ozone depletion are halocarbon refrigerants, such as chlorofluorocarbons (CFCs), HCFCs, halons).
    • So, the correct option is 'Both B and C'.
  • Question 10
    1 / -0
    A technique used to determine the concentration of odour compounds in a sample is known as:
    Solution
    A technique used to determine the concentration of odour compounds in a sample is known as stripping. 
    Stripping analysis is an advanced technique for the identification of odorous compounds present in drinking water. A stripping technique permits high stripping temperatures without creating technical problems. It has been shown to increase significantly the number of odorous compounds detected by column sniffing.
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