Multiple choice

Although the phenomenon of global warming was previously thought to have been prevalent in Antarctic region only, but findings reported by an expedition of Russian scientists to Arctic region have found that there has been considerable decrease in the ice sheets in these parts of the world, which are mainly attributed to as a direct result of global warming. This can help us in concluding that even the Arctic Circle is now under the influence of global warming.

Which of the following, if true, would most seriously weaken the conclusion of the argument above?

  1. The Antarctic Circle region is exhibiting a marked decrease in the rate of decrease in ice sheets.

  2. The temperature around the world has been increasing at a steady rate every year.

  3. There has been an increase in number of polluting units in the Northern Hemisphere, which are known to help aid in the phenomenon of Global Warming.

  4. Many reasons previously thought to have no effect on melting of Polar ice sheets are now considered to cause it.

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The author’s concludes that as there has been decrease in size of ice sheets in Arctic region, the phenomenon which occurs due to global warming, so Arctic Circle is under the influence of global warming. If, however, many more factors are now known to cause the decrease in ice sheet, nothing need have changed; it could be possible that the phenomenon is prevalent only in Antarctic region and new factors have caused the decrease in ice sheets in Arctic Circle. Hence, (4).

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