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Environmental Issues Test - 31

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Environmental Issues Test - 31
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Loss of top soil is called?
    Solution

  • Question 2
    1 / -0
    The destruction of forests for agricultural and commercial reasons has upset the _____________ balances.
  • Question 3
    1 / -0
    What is B.O.D.?
    Solution
    Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. 
  • Question 4
    1 / -0
    Temperature variation in Pacific ocean in present time is called as
    Solution
    Every few years unusually warm currents occur in the South Pacific Ocean of South America. This rise in temperature is due to a relaxation of the trade winds, that move the ocean waters throughout the globe. Without the trade winds, the surface waters rate of evaporation declines and heat loss slows. With the cooling of the South Pacific disrupted, unusually high temperatures occur along the coastal shores of Chile all the way up to Ecuador. El Nino is periodic increase in temperature, which fluctuates from a small increase in temperature. 
  • Question 5
    1 / -0
    Excess of carbon dioxide in the atmosphere leads to 
    Solution
    Modern human activities are responsible for the release of huge quantities of CO$$_2$$ in the atmosphere. The major activities, which contribute towards this, are burning of fossil fuels and cultivation of the soil. Although CO$$_2$$ is not considered as a pollutant, an increase in its proportion in the atmosphere can lead to global warming through increased greenhouse effect. 
  • Question 6
    1 / -0
    Which of the following is not the function of forest? 
    Solution
    Forests and trees make an essential contribution to food security by helping to maintain the environmental conditions needed for agricultural production. They stabilize the soil, prevent erosion, enhance the land's capacity to store water and moderate air and soil temperatures.
    Therefore, the correct answer is option D.
  • Question 7
    1 / -0
    Sewage water is purified for recycling by the action of:
    Solution
    Various microbial processes are used to treat this sewage waste by biological methods using microbes feeding on this waste. The bacteria and protozoa consume biodegradable soluble organic contaminants (e.g. sugars, fats, organic short-chain carbon molecules etc.) and bind much of the less soluble fractions into floc. The water is purified and can be recycled and reused again.
  • Question 8
    1 / -0
    Which of the following does not affect ozone layer ?
    Solution

  • Question 9
    1 / -0
    One of the causes of water pollution, is excessive use of ___________ and ___________ by the farmers:
    Solution
    Excessive use of fertilisers and pesticides in fields can lead to their seepage into the ground and mixing with groundwater. They can also be washed away with rain and carried to water bodies, where they can contaminate the water and the aquatic animals, especially fish. Human beings consuming such contaminated fish might be fatally poisoned.
    Also, rivers polluted by fertilisers allow the growth of algae that use dissolved oxygen in the water for their sustenance. This leads to oxygen deficiency in water, which can cause the death of other aquatic animals.
  • Question 10
    1 / -0
    If there was no $$CO_2$$ in the atmosphere, the earth's temperature would be:
    Solution
    Carbon dioxide gas has the property of trapping infra red radiations from the sun so it raises the global temperature by being heat trapper. In its absence the temperature of the earth will be less than the present temperature.
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