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Could you try the problem below? Please, explain your answer.
(I don't have the OA).
S11- Q19. Sunflowers growing in pots were placed, with their roots submerged, in the pond contaminated with radioactive elements. The sunflowers kept growing; in the process, they absorbed radioactive elements. Within twelve days, 85 percent of the radioactive elements were removed from the water, which is no less than can be accomplished with the much more expensive conventional filtration techniques. Scientists therefore propose using sunflowers for decontamination wherever there are radioactively contaminated ponds.
Which of the following, if true, points to a limitation on the applicability of the proposed method of decontamination?
A. Some plants other than sunflowers can also remove radioactive elements from water.
B. The water in many ponds contaminated with radioactive elements is so cold that it would kill sunflowers whose roots were submerged in it.
C. Sunflowers that grow with their roots submerged in water grow less well than sunflowers growing under optimal conditions on dry land.
D. Only species of sunflowers with large leaves can have their roots submerged in water and still keep growing.
E. In ponds in which the circulation of the water is artificially increased, sunflowers absorb radioactive elements far faster than they do in other ponds.
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Could you try the problem below? Please, explain your answer. (I don't have the OA).
S11- Q19. Sunflowers growing in pots were placed, with their roots submerged, in the pond contaminated with radioactive elements. The sunflowers kept growing; in the process, they absorbed radioactive elements. Within twelve days, 85 percent of the radioactive elements were removed from the water, which is no less than can be accomplished with the much more expensive conventional filtration techniques. Scientists therefore propose using sunflowers for decontamination wherever there are radioactively contaminated ponds.
Which of the following, if true, points to a limitation on the applicability of the proposed method of decontamination?
A. Some plants other than sunflowers can also remove radioactive elements from water. The argument is about sunflowers hence eliminate this choice
B. The water in many ponds contaminated with radioactive elements is so cold that it would kill sunflowers whose roots were submerged in it. This is the best choice because if sunflowers are not able to grow they will not decontaminate the contaminated water
C. Sunflowers that grow with their roots submerged in water grow less well than sunflowers growing under optimal conditions on dry land. This does not weakens the argument as sunflowers still, althought not to the optimum, will grow and hence decontaminate water
D. Only species of sunflowers with large leaves can have their roots submerged in water and still keep growing. Species of sunflowers is not the subject of the argument hence eliminate
E. In ponds in which the circulation of the water is artificially increased, sunflowers absorb radioactive elements far faster than they do in other ponds. This supports the argument hence not the correct choice
B points to a limitation on the applicability of the proposed method of decontamination because it shows that is many ponds, sunflowers can not be used to decontaminate ponds. The cold of the pond would kill the sunflowers.
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.