IB ESS HL 8.1.3 Population dynamics metrics Question Bank
Practise IB ESS SL/HL 8.1.3 by applying population dynamics metrics concepts to exam-style environmental systems questions.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify the relevant environmental system, process or evidence
- apply the correct ESS concept and explain the causal relationship
- evaluate the outcome using ecological, social or management evidence
8.1.3—Population dynamics metrics question 1
[Maximum number: 4]
Outline the similarities and differences between crude birth rate and natural increase rate.
Outline the similarities and differences between "crude birth rate" and "natural increase rate".
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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