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.
18. According to Table 1 and Figure 1, the Species M plants that were fed Solution 3 had an average zinc content of:
Your Answer is
Correct Answer is H
Explanation
Look at Table 1 first. When plant M is added to solution 3, the Nickel concentration is 10. Then look at Figure 1. When the abscissa is 10, the ordinate of the hollow square line representing the Zinc content of plant M is 200.