Demography pres part ii by dr najeeb (1)Presentation Transcript
POPULATION PYRAMIDS Pictorial presentation of 3 Factors (Influence Population) Births Deaths Migration
Features (Population Pyramids)In terms of its composition by:- Age, Sex Males (on Left side) Females (on Right side) Children (at bottom) Elders (at Top) Adjoining bars(contribution of each age, Sex group)
EXAMPLE Developing Country Developed Countries (Pakistan) (Sweden)Base: Broad (High Birth rate) Base: Narrow (Low Birth rate)Top: Narrow / Acute apex Middle: Bulge (Convex border) (No: of Elders (Less) Top: Obtuse apex (More Elders)High Dependency rate Low Dependency rateBad effect (on Economy) Good effect (on Economy) Unproductive (Half Pop) Productive ( More than Half Pop) Under 15 Ys: ---- 44% Pop: Under 15 Ys: ---- 25% Pop: B/w 15- 64 Ys: 52% Pop: Above 15 Ys: ---- 75% Pop:
DEMOGRAPHIC CHARACTERISTICSPopulation unevenly distributed with very densely populated areas very sparsely populated areas. All countries in region have a positive rate of natural population change.
DEMOGRAPHIC TRANSITIONGrowth Rate (%) Grading of population increase0 ( Zero) Stationary Growth (No Growth)0 to 0.5 Slow Growth0.5 to 1 Moderate Growth1 to 1.5 Rapid Growth1.5 to 2.0 Very Rapid Growth>2 Explosive Growth ( Population explosion) OR Population Bomb
DEMOGRAPHIC TRANSITION 3 TYPES1. Old balance Fertility Mortality2. New balance Fertility Mortality3. ImbalanceFertility Mortality
DEMOGRAPHIC CYCLE Germany, India in Hungary 1920 Many countries of India, China, S. Asia & Singapur Africa Pak in 1970