IB ESS HL 8.1.3 Population Dynamics Metrics Questions
Practise IB ESS HL 8.1.3 by applying population dynamics metrics concepts to environmental systems questions.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- Population dynamics can be quantified and analysed by calculating total fertility rate, life expectancy, doubling time and natural increase
- Total fertility rate is the average number of births per woman of childbearing age
- Life expectancy is the average number of years that a person can be expected to live, usually from birth, if demographic factors remain unchanged
- Doubling time is the number of years it would take a population to double its size at its current growth rate; it can be calculated by using the rule of 70
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IB ESS HL 8.1.3 Population Dynamics Metrics Questions question 1
[Maximum number: 4]
Outline the similarities and differences between crude birth rate and natural increase rate.
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Differences:
a. Crude birth rate (CBR) is the number of (live) births per 1000 individuals / CBR focuses only on births;
b. Natural increase rate (NIR) is the CBR - CDR divided by 10 / NIR is expressed as a percentage / NIR takes both births and deaths into account;
c. NIR can be negative / CBR may assume only a positive value;
d. Can estimate doubling time, if divide 70 by NIR;
e. NIR is a more accurate/direct indicator of population growth;
Similarities:
f. Both involve number of births in their calculation;
g. Both refer to mean values;
h. Both give some indication of potential for growth;
i. Both are (usually) annual values;
j. Same data sources/data collection methods for both (census, civil registration, household surveys);
k. Both are required for assigning a country into a specific stage of the Demographic Transition Model;
I. Both exclude immigration and emigration.
Note to examiners: Allow [3max] if only differences or only similarities.
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