SAT Subject Biology Practice Question 149: Answer and Explanation
19. In a long-running ecological study, the species richness of mosses, shrubs, and trees was calculated for one hectare (10,000 m2) of land every 50 years for 200 years. The data are shown in the table.
During which time period do the data suggest this area may have experienced a natural disaster?
Correct Answer: C
The data show a significant decrease in diversity for all three plant types between 1850 and 1900, suggesting some catastrophic event (for example, forest fire).