Passage III

Scientists studied the effects of pH and of nickel concentration on plant growth and on the uptake of iron and zinc by plants. Recently germinated seedlings of Species M and Species U were fed 1 of 12 nutrient solutions (Solutions 1−12) for 8 days and then were harvested. Solutions 1−12 differed only in pH and/or nickel concentration.Table 1 shows, for each species, the average dry mass of the plants that were fed each nutrient solution. Figure 1 shows, for each species, the average iron content and the average zinc content of the plants that were fed Solutions 1−4.

19. According to Table 1 and Figure 1, for the Species M plants that were fed Solutions 1−4, what was the order of the nutrient solutions, from the solution that resulted in the lowest average iron content to the solution that resulted in the highest average iron content?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Look at Table 1 first. When plant M is added to solutions 1-4, the Nickel concentration value corresponds exactly to the abscissa value in Figure 1. The solid triangle line representing the iron content of plant M is decreasing, so sort from small to large , should be 4321.