The graph shows how the population of the world has increased over time.
Which growth curve phase is represented by region P?
A) death phase
B) exponential (log) phase
C) lag phase
D) stationary phase
▶️ Answer/Explanation
Ans: B
Region P shows a steep, upward-curving trend, characteristic of the exponential (log) phase (B) where population grows at an accelerating rate. This differs from: the lag phase (C) with slow initial growth, stationary phase (D) where growth stabilizes, and death phase (A) which shows population decline. The rapid growth pattern matches the exponential phase of population growth curves.
The graph shows the increase in the human population of the world since 1630.
What was the longest time taken for the population to double?
A) 100 years
B) 200 years
C) 300 years
D) 400 years
▶️ Answer/Explanation
Ans: B
From the graph, the population took about 200 years to double from 1630 (around 500 million) to 1830 (around 1 billion). This was the longest doubling period shown. After 1830, doubling times became progressively shorter due to advances in medicine, agriculture, and technology.