Passage II
The gypsy moth, which is native to Asia and Europe, was accidentally introduced to the northeastern United States in 1869. Gypsy moth larvae (caterpillars) eat tree leaves and have caused serious damage to forest ecosystems in the United States. Figure 1 shows the times of the year that the different stages of the gypsy moth life cycle occur. Figure 2 shows the percent of 1,000 test plots having light, moderate, or heavy defoliation (leaf loss) due to gypsy moth larvae each year from 1979 to 1983. Table 1 shows the average percent defoliation by gypsy moth larvae for individual tree species in the test plots in 1981.
10. Based on Figure 2, for what year did exactly 80 plots show moderate defoliation?
Your Answer is
Correct Answer is F
Explanation
1000 test plots were used in the first experiment, and 80 plots have moderate defoliation, which is 8%;
Look directly at the year 1980 in figure 2, the moderate defoliation corresponding to the gray part is exactly 8 %