When one aspena single stemdies 20 the entire clone

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when one aspen—a single stem—dies, (20) the entire clone is affected. While alive, a stem sends hormones into the root system to suppress formation of further stems. But when the stem dies, its hormone signal also ceases. If a clone (25) loses many stems simultaneously, the resulting hormonal imbalance triggers a huge increase in new, rapidly growing shoots that can outnumber the ones destroyed. An aspen grove needs to 32
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(30) experience fire or some other disturbance regularly, or it will fail to regenerate and spread. Instead, coniferous trees will invade the aspen grove’s borders and increasingly block out sunlight needed by the aspens. -------------------------------------------------------------------------------- Q35: The primary purpose of the passage is to explain the A. qualities that make a particular organism unique B. evolutionary change undergone by a particular organism C. reasons that a phenomenon benefits a particular organism D. way in which two particular organisms compete for a resource E. means by which a particular organism has been able to survive in a barren region Answer: -------------------------------------------------------------------------------- Q36: It can be inferred from the passage that when aspen groves experience a “disturbance” (line 30), such a disturbance -------------------------------------------------------------------------------- Q37: The author of the passage refers to “the bark of most trees” (line 6) most likely in order to emphasize the ------------------------------------------------------------------------------------------------------------ Q38: Nitrogen dioxide is a pollutant emitted by automobiles. Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been required in all new cars in Donia since 1993, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country. Yet although the proportion of new cars in 33
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Donia’s capital city has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 1993. Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia’s capital city?
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  • Spring '12
  • Krugers
  • d., Christopher Nolan, B., c., E., Draw-A-Person Test

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