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Once ingested by a caterpillar(55 the crystals

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Unformatted text preview: Once ingested by a caterpillar, (55) the crystals dissolve, releasing the virus to infect the insect’s cells. Late in the course of the infection, millions of new virus particles are formed and enclosed in polyhedrin (60) crystals. These crystals reenter the environment after the insect dies and decomposes, thus becoming avail- able to infect other caterpillars. One of the attractions of this (65) hypothesis is its broad applicability. 29 Remarkably, despite significant differ- ences in habitat and behavior, many species of lepidoptera have population cycles of similar length, between eight (70) and eleven years. Nuclear polyhe- drosis viral infection is one factor these disparate species share.-------------------------------------------------------------------------------- Q34: Which of the following, if true, would most weaken the author’s conclusion in lines 25- 30? A. New research reveals that the number of species of birds and parasites that prey on lepidoptera has dropped significantly in recent years. B. New experiments in which the habitats of lepidoptera are altered in previously untried ways result in the shortening of lepidoptera population cycles. C. Recent experiments have revealed that the nuclear polyhedrosis virus is present in a number of predators and parasites of lepidoptera. D. Differences among the habitats of lepidoptera species make it difficult to assess the effects of weather on lepidoptera population cycles. E. Viral disease is typically observed in a large proportion of the lepidoptera population. Answer: -------------------------------------------------------------------------------- Q35: It can be inferred from the passage that the mortality caused by agents such as predatory birds or parasites was measured in an attempt to A. develop an explanation for the existence of lepidoptera population cycles B. identify behavioral factors in lepidoptera that affect survival rates C. identify possible methods for controlling lepidoptera population growth D. provide evidence that lepidoptera populations are self-regulating E. determine the life stages of lepidoptera at which mortality rates are highest Answer: -------------------------------------------------------------------------------- Q36: The primary purpose of the passage is to A. describe the development of new techniques that may help to determine the driving force behind population cycles in lepidoptera B. present evidence that refutes a particular theory about the driving force behind population cycles in lepidoptera C. present a hypothesis about the driving force behind population cycles in lepidoptera D. describe the fluctuating patterns of population cycles in lepidoptera 30 E. question the idea that a single driving force is behind population cycles in lepidoptera Answer: -------------------------------------------------------------------------------- Q37: According to the passage, before the discovery of new techniques for detecting viral DNA, population ecologists believed that viral diseases A. were not widely prevalent among insect populations generallyA....
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Once ingested by a caterpillar(55 the crystals dissolve...

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