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.

7. A student hypothesized that gypsy moth populations peak every 10 years. If this hypothesis is correct, Figure 2 indicates that the next peak in the gypsy moth population most likely occurred in:

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

According to line 7 of the first paragraph of the article, defoliation is caused by moth, the more moth, the more serious the defoliation.

Corresponding to figure 2, it can be seen that the defoliation was the most serious in 1981, and the moth was the most this year.

According to the question, a cycle of 10 years, the next moth will be 1991