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Environmental Issues Test - 22

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Environmental Issues Test - 22
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Plants remove carbon in the form of:
    Solution
    Plants remove carbon in the form of carbon dioxide from the atmosphere during the process of photosynthesis.
  • Question 2
    1 / -0
    Deforestation will decrease
    Solution
    Deforestation is the process of extensive cutting of trees, which finally leads to the destruction of forests as the trees are removed in large numbers, the water cycle gets disturbed which results in decrease in rainfall
    So, the correct answer is 'Rainfall'
  • Question 3
    1 / -0
    Biochemical oxygen demand measures
    Solution
    Biochemical oxygen demand or BOD is the amount of oxygen required to decompose organic matter in one litre of polluted water.
    If the water is more polluted, more will be the BOD because more will be the organic matter present in it and hence, more oxygen will be required to decompose it.
    So, BOD measures the amount of dissolved oxygen required for decomposers to decompose the organic matter in the water.
    So, the correct answer is 'Dissolved oxygen required for decomposers'.
  • Question 4
    1 / -0
    Extensive planting of trees to increase forest cover is called
    Solution
    Afforestation is the process of planting a large number of trees for increasing forest cover, while deforestation is the process of cutting trees in large numbers from the forest.
    So, the correct answer is 'Afforestation'
  • Question 5
    1 / -0
    Main cause of extinction of species from tropical areas is
    Solution
    When there are no more individuals of a species (plant or animal) alive anywhere in the world, the species is said to be extinct. Extinction is also known as the process of dying out. The process is a completely natural part of evolution. But sometimes extinctions happen at a higher and a faster rate than usual. Factors such as large body size, habitat loss, small population and position at a higher trophic level favor extinction. Since the species residing in the tropics have their major habitat in the form of forests, thus deforestation causes, extinction of such species.
    So, the correct answer is 'Deforestation'.
  • Question 6
    1 / -0
    Decrease in species diversity in tropical countries is mainly due to
    Solution
    When there are no more individuals of a species (plant or animal) alive anywhere in the world, the species is said to be extinct. A decrease in the species diversity progresses to extinction if left uncontrolled. Extinction is also known as the process of dying out. The process is a completely natural part of evolution. But sometimes extinctions happen at a higher and a faster rate than usual. Factors such as large body size, small population, massive habitat loss and position at a higher trophic level favor extinction. As forests are the main habitat for the wild animals, their loss favors the extinction of the same.
    So, the correct answer is 'Deforestation'.
  • Question 7
    1 / -0
    Deforestation generally decreases
    Solution
    Deforestation means clearing or removal of forest by extensive cutting of trees, water cycle which goes on in the environment gets disturbed by lack of  sufficient number of trees. Trees increase the amount of rainfall due to transpiration, therefore if number of trees decrease rainfall also decreases, while other factors given in the options A, B & D increases.
    So, the correct answer is 'Rainfall'
  • Question 8
    1 / -0
    Huge quantity of sewage is dumped in a river. The BOD will.
    Solution
    A huge quantity of sewage increases Organic matter in the river water.
    The oxygen demand by bacteria to degrade the organic matter increases.
    The biological oxygen demand increases.
    So, the correct option is 'Increase'.
  • Question 9
    1 / -0
    Global warming will cause.
    Solution
    Global warming causes melting of polar ice caps. This decreases the size of glaciers and leads to the rise of oceans.
    So, the correct option is 'All of the above'.
  • Question 10
    1 / -0
    The first atomic bomb was thrown over.
    Solution
    On August 6, 1945, the first atomic bomb of five-ton was  dropped over the city of Hiroshima in Japan. A blast equivalent to the massive power of tons of TNT demolished four square miles of the city to ruins and immediately killed 80,000 people.
    So, the correct option is Hiroshima.
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