Passage Reading and English Comprehension
(a) Species interdependence is a point of weakness for some plants, but is generally beneficial to insects involved in pollination
(b) Efforts to control the spruce budworm have had deleterious effects on the red-osier dogwood
(c) The use of pesticides may be endangering certain plant species dependent on insects for pollination
(d) Plant species lacking key factors in their defenses against human environmental disruption will probably become extinct
855. According to the author, a flowering plant species whose fecundity has declined due to pesticide spraying may not experience an overall population decline if the plant species can do which of the following?
(a) Reproduce itself by means of shoots and runners
(b) Survive to the end of the growing season
(c) Survive in harsh climates
(d) Respond to the fecundity decline by producing more flowers.
856. The passage suggests that the lack of an observed decline in the fecundity of the creeping dogwood strengthens the researchers conclusions regarding pesticide use because the
(a) creeping dogwood is a species that does not resemble other forest plants
(b) creeping dogwood is a species pollinated by a broader range of insect species than are most dogwood species
(c) creeping dogwood grows primarily in regions that were not sprayed with pesticide, and so served as a control for the experiment
(d) creeping dogwood is similar to the red-osier dogwood, but its insect pollinators are known to be insensitive to the pesticide used in the study
857. The passage suggests that which of the following is true of the forest regions in New Brunswick sprayed with most anti-budworm pesticides other than Matacil?
(a) The fecundity of some flowering plants in those regions may have decreased to an even greater degree than in the regions where Matacil is used
(b) Insect mortality in those regions occurs mostly among the larger species of insects, such as bumblebees
(c) The number of seeds produced by common plant species in those regions is probably comparable to the number produced where Matacil is sprayed
(d) Many more plant species have become extinct in those regions than in the regions where Matacil is used.
858. It can be inferred that which of the following is true of plant fecundity as it is defined in the passage?
(a) A plantís fecundity decreases as the percentage of unpollinated flowers on the plant increases
(b) A plantís fecundity decreases as the number of flowers produced by the plant decreases
(c) A plantís fecundity increases as the number of flowers produced by the plant increases
(d) A plantís fecundity is usually low if the plant relies on a small number of insect species for pollination.
859. It can be inferred from the passage that which of the following plant species would be LEAST likely to experience a decrease in fecundity as a result of the spraying of a pesticide not directly toxic to plants?
(a) A flowering tree pollinated by only a few insect species
(b) A kind of insect-pollinated vine producing few flowers
(c) A wind-pollinated flowering tree that is short-lived
(d) A flowering shrub pollinated by a large number of insect species
860. Which of the following assumptions most probably underlies the authorís tentative recommendation
(a) Human activities that result in environmental disruption should be abandoned
(b) The use of pesticides is likely to continue into the future
(c) It is economically beneficial to preserve endangered plant species
(d) Conservation efforts aimed at preserving a few well-chosen species are more cost-effective than are broader-based efforts to improve the environment
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