Question 1.6 Choose the correct answer(s)The following graphs show the world population in millions from 1000 to 2010 and the world population growth rate in the 20th century. Based on this information, read the following statements and select the correct one(s).

Question

BlackTom AI · Accepted Answer

Population increased from roughly 1,000 million around 1800 to about 7,000 million by 2010, so the percent change is (7,000 − 1,000)/1,000 × 100% = 600%.

1) Relevant concepts
- Reading values from a time-series graph (estimating population in millions at given years).
- Percent change: (final − initial)/initial × 100%.
- Interpretation of a growth-rate curve: a positive but declining growth rate means population still grows but more slowly; a negative growth rate would indicate shrinking.

2) Step-by-step reasoning and calculations
- Read approximate population at two times separated by ~200 years: around 1800 the top plot shows ≈1,000 million (1 billion); by 2010 it shows ≈7,000 million (7 billion).
- Compute increase: 7,000 − 1,000 = 6,000 million.
- Percent increase = (6,000 / 1,000) × 100% = 6 × 100% = 600%.
- The lower plot (average annual growth rate, 1910–2010) shows rates rising to a peak near 1960 (~1.9%) then declining to ≈1.2% by 2010. Because the rate stays positive, population continues to grow, but the rate is not increasing in recent decades.

3) Why the correct answers are correct
- a is correct because the numeric calculation above yields a 600% increase over approximately the past 200 years.
- b is correct because the top graph is nearly flat from 1000–1700 (little absolute increase compared with later centuries), and then the slope becomes much steeper after ~1700 indicating sharply higher growth.

4) Why the other options are incorrect
- c is incorrect: the growth rate plot remains positive through 2010, so the graphs do not suggest near-term shrinking (shrinking would require negative growth rates).
- d is incorrect: although population is still increasing, the growth rate peaked mid‑20th century and has been declining, so the population is not growing at an increasing rate.

Conclusion: therefore options a and b are correct, matching the provided answer.

Question 1.6 Choose the correct answer(s)The following graphs show the world population in millions from 1000 to 2010 and the world population growth rate in the 20th century. Based on this information, read the following statements and select the correct one(s).多项选择题

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