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.
15. According to Figure 1, as the nickel concentration in the nutrient solutions increased, the average iron content of Species M plants:
Your Answer is
Correct Answer is B
Explanation
Looking at Figure 1, when the abscissa is getting bigger and bigger, the solid square line representing the Species Miron content is decreasing.