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Environmental Issues Test - 61

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Environmental Issues Test - 61
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The term 'Phytoremediation' refers to the _________________.
  • Question 2
    1 / -0
    The easiest way to improved the denuded forests of teak in India in to.
  • Question 3
    1 / -0
    Water pollution of a river is measured by __________.
    Solution
    Biochemical oxygen demand is a measure of how much dissolved oxygen is being consumed as microbes break down organic matter. A high oxygen demand, therefore indicates that levels of dissolved oxygen are falling, with potentially dangerous implications for the river's biodiversity. High biochemical oxygen demand can be caused by high levels of organic pollution. Thus the correct answer is option D. 
  • Question 4
    1 / -0
    Water pollination is best assessed by determining.
    Solution
     D.O. is the dissolved gaseous form of oxygen that is essential for respiration of fish and other aquatic organisms. Wastewater from sewage treatment plants often contains organic materials that are decomposed by microorganisms. The amount of oxygen consumed by these organisms in breaking down the waste is known as the biochemical oxygen demand or BOD. BOD directly affects the amount of dissolved oxygen in rivers and streams. The greater the BOD, the more rapidly oxygen is depleted in the stream, thus reducing the oxygen available to higher forms of aquatic life. Pollution, therefore, increases the BOD of a water body. So, the water pollution status of a water body can be assessed by studying the dissolved oxygen (DO) and biological oxygen demand (BOD) of the water body. So, the correct option is 'DO and BOD'.
  • Question 5
    1 / -0
    Two bottles were half filled with water from Ganga ('P') and Kaveri ('Q') and kept under identical airtight conditions for 5 days. The oxygen was determined to be 2% in bottle ('P') and 10% in bottle ('Q'). What could because of this indifference?
    Solution
    Biochemical oxygen demand or BOD is the amount of dissolved oxygen needed by the aerobic bacteria present in water in a given amount of time. Given that 'P' has 2% oxygen and 'Q' has 10% oxygen dissolved after 5 days in an airtight condition. So, one can conclude that the aerobic bacteria present in 'P' is more than 'Q' as BOD of 'P' is much more than 'Q'. So Ganga is more polluted than Kaveri.    
  • Question 6
    1 / -0
    Which one of the following human activities would cause least damage to the ecosystem?
  • Question 7
    1 / -0

    Directions For Questions

    Read the given passage carefully and answer the question that follows.

        There is a fairly universal sentiment that the use of nuclear weapons is clearly contrary to morality and that its production probably so,  does not go far enough. These activities are not only opposed to morality but also to the law if the legal objection can be added to the moral, the argument against the use and the manufacture of these weapons will considerably be reinforced. Now the time is ripe to evaluate the responsibility of scientists who knowingly use their expertise for the construction of such weapons, which has a deleterious effect on mankind.
        To this must be added the fact that more than 50 percent of the skilled scientific manpower in the world is now engaged in the armaments industry. How appropriate it is that all this valuable skill should be devoted to the manufacture of weapons of death in a world of poverty is a question that must touch the scientific conscience.
            A meeting of biologists on the Long-Term Worldwide Biological consequences of nuclear were added frightening dimension to those forecasts. Its report suggested that the ling biological effects resulting from climatic changes may at least be as serious as the immediate ones. Sub-freezing temperatures, low light levels, and high doses of ionizing and ultraviolet radiation extending for many months after a large-scale nuclear war could destroy the biological support system of civilization, at least in the Northern Hemisphere. Productivity in natural and agricultural ecosystems could be severely restricted for a year or more. Postwar survivors would face starvation as well as freezing conditions in the dark and be exposed to near-lethal doses of radiation. If, as now seems possible, the Southern Hemisphere were affected also, global disruption of the biosphere could ensue. In any event, there would be severe consequences, even in the areas not affected directly, because of the interdependence of the world economy. 
    In either case the extinction of a large fraction of the earth's animals, plants and microorganism seem possible. The population size of Homo sapiens conceivably could be reduced to prehistoric levels or below, and extinction of the human species itself cannot be excluded.

    ...view full instructions

    According to the passage, the argument on use and manufacture of nuclear weapons
    Solution
    The second sentence of the passage states, 'These activities are not only opposed to morality but also to law if the legal objection can be added to the moral, the argument against the use and the manufacture of these weapons will considerably be reinforced.'
  • Question 8
    1 / -0
    The release of CO2CO_2 into air can cause:
    Solution
    Global warming occurs when carbon dioxide and other air pollutants called the greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface.
    Hence, the correct answer is 'Global warming'.
  • Question 9
    1 / -0
    Lead in the atmosphere can cause
    Solution
    Lead is an elemental heavy metal found naturally in the environment as well as manufactured products. Lead can be directly released into air, as suspended particles. Humans may be exposed to lead from air pollution directly, through inhalation or through the incidental ingestion of lead that settles out from air onto soil or dust. Lead distributes throughout the body through the blood and accumulates in the bones. Depending on the level of exposure, lead can adversely affect the nervous system, kidney function, immune system, etc. 
    So the correct option is 'brain damage'.
  • Question 10
    1 / -0
    The gas that usually causes explosion in coal mines is
    Solution
     There are two main types of coal mine explosions: methane and coal dust. Methane explosions occur when a buildup of methane gas contacts a heat source and there is not enough air to dilute the gas level below its explosion point. 
    So, the correct option is 'methane'.
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