The passage suggests that unlike the pleiotro
问题详情
The passage suggests that, unlike the pleiotropic hormones, oligosaccharins could be used effectively to______
A．trace the passage of chemicals through the walls of cells
B．pinpoint functions of other plant hormones
C．artificially control specific aspects of the development of crops
D．alter the complement of genes in the cells of plants
E．alter the effects of the five major hormones on plant development请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
解析：ThebestanswerisC.Lines16-18statethatbecauseeachpleiotropichormonehassomanydifferenteffectsonaplant,pleiotropichormones“arenotveryusefulinartificiallycontrollingthegrowthofcrops”(lines17-18).Incontrast,thepassageindicatesthatoligosaccharinshavespecificeffectsonthegrowthanddevelopmentofplants.Thus,incomparisontothepleiotropichormones,oligosaccharinscouldpotentiallybeeffectiveinartificiallycontrollingspecificaspectsofcropdevelopment.ChoicesA,B,D,andEcanbeeliminatedbecausetheydescribefunctionsthatarenotattributedinthepassageeithertothepleiotropichormonesortooligosaccharins.
