Q.103 The relative number of individuals in each age group is an important demographic factor for the
study of future growth trends, and this is normally depicted in the form of an age-structure pyramid.
Based on your understanding on population dynamics, match the following distribution properties
of age structure (Group 1) with the individual forecast given (Group 2):
Group 1
I). Uniform age distribution in the pyramid
II). Distribution skewed towards younger age groups
III). Distribution skewed towards older age groups
IV). Reduction in the number of males in the middle age group
Group 2
i). Emigration in the recent past and the possible increase in the older age groups in the near
future.
ii). Likely to be a stable population
iii). Possible unemployment in the near future
iv). Increased government expenditure on medical needs and social security related issues in the
near future
(A) I – iii; II – ii; III– i; IV – iv (B) I – ii; II – iii; III – iv; IV – i
(C) I – ii; II – i; III – iii; IV – iv (D) I – i; II – iii; III – ii; IV – iv
Option (B) correctly matches age structure distributions to population forecasts: I-ii (stable), II-iii (unemployment), III-iv (medical costs), IV-i (emigration).
Uniform distribution predicts stability; youth bulge signals job scarcity; elderly skew demands eldercare; middle male dip indicates past emigration.
Age Structure Interpretations
Population pyramids reveal demographic momentum. Uniform (rectangular) = equal cohorts → replacement fertility, stable size. Young-skewed (broad base) = high birth rates → future workforce bulge → unemployment pressure. Old-skewed (narrow base) = low fertility → aging population → healthcare/social security strain. Middle male constriction = emigration of working-age men.
Matching Breakdown
Group 1 → Group 2:
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I. Uniform → ii. Stable population: Balanced age classes sustain constant size (TFR ~2.1).
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II. Young skew → iii. Unemployment: Echo generation enters job market simultaneously.
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III. Old skew → iv. Medical/social security: Shrinking workers support growing retirees (dependency ratio ↑).
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IV. Middle male reduction → i. Emigration: Working-age males leave → older cohorts dominate near future.
Option Analysis
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(A) I-iii; II-ii; III-i; IV-iv: Wrong—I (uniform) ≠ unemployment; II (young) ≠ stable.
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(B) I-ii; II-iii; III-iv; IV-i: Correct—all logical matches.
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(C) I-ii; II-i; III-iii; IV-iv: Wrong—II (young bulge) ≠ emigration (that’s IV).
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(D) I-i; II-iii; III-ii; IV-iv: Wrong—I (stable) ≠ emigration; III (old) ≠ stable.
Introduction to Age Structure Pyramid Population Dynamics
Age structure pyramid population dynamics predicts societal trends—GATE Life Sciences demography essential. Uniform = stable; youth-heavy = job crisis ahead; elderly skew = pension strain; male middle-dip = emigration aftermath. Q.103 tests pyramid interpretation skills.
Pyramid Shapes Decoded
| Shape (Group 1) | Demographics | Future (Group 2) |
|---|---|---|
| I. Uniform | TFR=2.1, balanced | ii. Stable population |
| II. Young skew | High fertility | iii. Unemployment boom |
| III. Old skew | Low fertility, ↑lifespan | iv. Medical expenditure |
| IV. Male middle↓ | Emigration | i. Older dominance |
Why (B) Perfect Match
Uniform ≠ emigration (D wrong); youth bulge ≠ stable (A/C wrong). Middle male loss specifically signals working-age exodus → future elderly relative increase.
GATE Strategy
Age structure pyramid population dynamics: Rectangular=stable; base-broad=growth→unemployment; top-heavy=decline→welfare. PYQ pattern: match shapes→consequences. Answer: (B).
