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Discussion

Match the animal inactivity behaviors listed in Column I with representative animals in Column II and their definitions listed in Column III.

Column IColumn IIColumn III
P. Torpor(i) Australian burrowing frogsa. Prolonged period of inactivity without reducing body temperature
Q. Hibernation(ii) Polar Bearsb. Inactivity period which accompanies extended periods of dryness
R. Winter sleep(iii) Ground Squirrelsc. Decreased metabolism with lowered body temperature occurring in daily activity cycles
S. Aestivation(iv) Hummingbirdsd. Decreased metabolism and lower body temperature for weeks or months

  • A.P-(ii)-c, Q-(iv)-b, R-(i)-a, S-(iii)-d
  • B.P-(iv)-c, Q-(iii)-d, R-(ii)-a, S-(i)-b
  • C.P-(iv)-c, Q-(ii)-b, R-(i)-a, S-(iii)-d
  • D.P-(iv)-b, Q-(i)-c, R-(ii)-d, S-(iii)-a

Answer: B

The correct match is P-(iv)-c, Q-(iii)-d, R-(ii)-a, S-(i)-b.

  • Torpor is a short drop in metabolism and body temperature within the daily cycle; hummingbirds enter it every night to save energy (iv-c).
  • Hibernation is a deep fall in metabolism and body temperature lasting weeks or months, as in ground squirrels (iii-d).
  • Winter sleep, or winter dormancy, is long inactivity in which body temperature stays close to normal; denning polar bears are the example (ii-a).
  • Aestivation is dormancy during long dry periods, as in Australian burrowing frogs, which wait out droughts underground (i-b).

Options A and C give hibernation to polar bears or hummingbirds and aestivation to ground squirrels, and option D attaches the definitions to the wrong behaviours.

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