Disturbances Change Populations Practice Test

A pesticide spill occurred near a pond between Year 1 and Year 2. Disturbances can change population dynamics. The algae population (cells per mL) was measured:

• Year 1 (before spill): 300
• Year 2: 80
• Year 3: 120
• Year 4: 200
• Year 5: 260

Which explanation best describes the population response using evidence from the data?

A wildfire occurred in a pine forest in Year 2. The table shows the deer population over time. Disturbances can change population dynamics. If a similar wildfire happens again in Year 6, which prediction about future population change is supported by the evidence from the first wildfire?

Deer population (individuals): Year 1 = 300, Year 2 = 290 (wildfire), Year 3 = 180, Year 4 = 200, Year 5 = 240, Year 6 = 270