SAT Subject Biology Practice Question 149: Answer and Explanation

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Question: 149

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.

YEARMOSSESSHRUBSTREES
18001620
18502174
19001053
195013126
2000172814

During which time period do the data suggest this area may have experienced a natural disaster?

A. 1750-1800
B. 1800-1850
C. 1850-1900
D. 1900-1950
E. 1950-2000

Correct Answer: C

Explanation:

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).

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