CAT 2017 Question Paper | Verbal Slot 2

CAT Previous Year Paper | CAT VARC Questions | Question 29

CAT VARC has changed a lot since 2014-15 and has increased the number of RC based questions and the other part called as verbal ability also saw an inclination towards questions that require extensive reading than anything else (read as vocab and grammar). We have tried to present here the CAT 2017 VARC Section with detailed solutions in a student friendly format to test yourself and understand the importance of reading for VARC section of the CAT exam. For a curated reading list head out here: Bharath's Reading List. If you are planning to take CAT 2017 paper as a full fledged mock, it would help if you go back to : CAT Question Bank and solve questions that are not from actual CAT Question papers.


The passage given below is followed by four alternate summaries. Choose the option that best captures the essence of the passage.

Question 29 : North American walnut sphinx moth caterpillars (Amorpha juglandis) look like easy meals for birds, but they have a trick up their sleeves — they produce whistles that sound like bird alarm calls, scaring potential predators away. At first, scientists suspected birds were simply startled by the loud noise. But a new study suggests a more sophisticated mechanism: the caterpillar's whistle appears to mimic a bird alarm call, sending avian predators scrambling for cover. When pecked by a bird, the caterpillars whistle by compressing their bodies like an accordion and forcing air out through specialized holes in their sides. The whistles are impressively loud — they have been measured at over 80 dB from 5 cm away from the caterpillar — considering they are made by a two-inch long insect.

  1. North American walnut sphinx moth caterpillars will whistle periodically to ward off predator birds - they have a specialized vocal tract that helps them whistle.
  2. North American walnut sphinx moth caterpillars can whistle very loudly; the loudness of their whistles is shocking as they are very small insects.
  3. The North American walnut sphinx moth caterpillars, in a case of acoustic deception, produce whistles that mimic bird alarm calls to defend themselves
  4. North American. walnut sphinx moth caterpillars, in. a case of deception and camouflage, produce whistles that mimic bird alarm calls to defend themselves.

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Explanatory Answer

The paragraph explains how North American walnut sphinx moth caterpillars scare off bird predators: the caterpillar's whistle appears to mimic a bird alarm call, sending avian predators scrambling for cover.

Option 1 talks of a ‘specialized vocal tract’ which is not mentioned in the paragraph. Option 2 is incorrect as explained in the paragraph; it is not the loudness of the noise but the fact that it mimics a bird alarm call that frightens away the birds. Option 4 mentions ‘camouflage’, which is not discussed in the paragraph.


Choice C is the correct answer.

 

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