Passage Reading and English Comprehension
(a) Observations of animalsí physiological behavior in the wild are not reliable unless verified by laboratory studies
(b) It is generally less difficult to observe the physiological behavior of an animal in the wild than in the laboratory
(c) The level of lactic acid in an animalís blood is likely to be higher when it is searching for prey than when it is evading predators
(d) The physiological behavior of animals in a laboratory setting is not always consistent with their physiological behavior in the wild
862. It can be inferred from the passage that by describing the Weddell seal as preparing ďfor the worstĒ, biologists mean that it
(a) prepares to remain underwater for no longer than twenty minutes
(b) exhibits physiological behavior similar to that which characterizes dives in which it heads directly for its prey
(c) exhibits physiological behavior similar to that which characterizes its longest dives in the wild
(d) begins to exhibit predatory behavior
863. The passage suggests that during laboratory dives, the pH of the Weddell sealís blood is not adversely affected by the production of lactic acid because
(a) only those organs that are essential to the sealís ability to navigate underwater revert to an anaerobic mechanism
(b) the seal typically reverts to an anaerobic metabolism only at the very end of the dive
(c) organs that revert to an anaerobic metabolism are temporarily isolated from the sealís bloodstream
(d) oxygen continues to be supplied to organs that clear lactic acid from the sealís bloodstream
864. Which of the following best summarizes the main point of the passage?
(a) Recent field studies have indicated that descriptions of the physiological behavior of the Weddell seal during laboratory dives are not applicable to its most typical dives in the wild
(b) The Weddell seal has developed a number of unique mechanisms that enable it to remain submerged at depths of up to 500 meters for up to 70 minutes
(c) The results of recent field studies have made it necessary for biologists to revise previous perceptions of how the Weddell seal behaves physiologically during its longest dives in the wild
(d) Biologists speculate that laboratory studies of the physiological behavior of seals during dives lasting more than twenty minutes would be more accurate if the seals were not forcibly submerged.
865. According to the author, which of the following is true of the laboratory studies?
(a) They fail to explain how the seal is able to tolerate the increased production of lactic acid by organs that revert to an anaerobic metabolism during its longest dives in the wild
(b) They present an oversimplified account of mechanisms that the Weddell seal relies on during its longest dives in the wild
(c) They provide evidence that undermines the view that the Weddell seal relies on an anaerobic metabolism during its most typical dives in the wild
(d) They are based on the assumption that Weddell seals rarely spend more than twenty minutes underwater on a typical dive in the wild.
866. The author cites which of the following as characteristic of the Weddell sealís physiological behavior during dives observed in the laboratory?
I. A decrease in the rate at which the sealís heart beats
II. A constriction of the sealís arteries
III. A decrease in the levels of lactic acid in the sealís blood
IV. A temporary halt in the functioning of certain organs
(a) I and III only
(b) II and IV only
(c) II and III only
(d) I, II, and IV only
867. The passage suggests that because Weddell seals are forcibly submerged during laboratory dives, they do which of the following?
(a) Exhibit the physiological responses that are characteristic of dives in the wild that last less than twenty minutes
(b) Exhibit the physiological responses that are characteristic of the longer dives they undertake in the wild
(c) Cope with oxygen deprivation less effectively than they do on typical dives in the wild
(d) Produce smaller amounts of lactic acid than they do on typical dives in the wild.
Download Free EBooks for GMAT, GRE, ACT, SAT, LSAT, MCAT etc.
Tell Your Freind