Read before you practise · 3 min
Read Age Pyramids to Predict Population Direction
Age pyramids compare pre-reproductive, reproductive and post-reproductive groups to signal population trends.
NSEB · Organisms and Populations · 2 linked questions · 100% coverage
Know this first
Age Structure is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Study deeper: NCERT Biology · Organisms and Populations
Read the pyramid base
A broad pre-reproductive base suggests an expanding population; similar cohort widths suggest stability; a narrow base with relatively older cohorts points to decline.
Use all three age groups
Each pyramid describes age distribution. The pattern can help project future population size and compare reproductive potential.
OlympIQ exam lens
- ✓Broad base → likely expansion.
- ✓Near-uniform cohorts → relatively stable.
- ✓Narrow base/older cohorts → likely decline.
OlympIQ trap
A declining pyramid still shows age distribution; do not exclude it from age-structure analysis.
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