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.
20. According to Table 1, compared to the average dry mass of Species U plants that were fed Solution 3, the average dry mass of Species M plants that were fed Solution 6 was approximately:
Your Answer is
Correct Answer is J
Explanation
Looking at Table 1, first find that the mass of plant U when added to solution 3 is 9.6g, while the mass of plant M when added to solution 6 is 28.8, which is 3 times that of U-3.