Demographics & Migration — Study Notes

Overview

Demographics and migration constitute a vital intersection of geography, economics, and public policy — topics that appear regularly in UPSSSC PET. Questions test your grasp of India's census data (population, growth, literacy, sex ratio), state-level variations, and migration trends. Understanding these concepts helps you interpret data-based questions and connect demographic patterns to development policies.

For UPSSSC PET, expect 2–3 questions from this topic, often appearing as direct fact recall (e.g., census year, sex ratio definition) or data interpretation from tables/graphs showing state-wise population or literacy. Mastering census terminology, decadal trends (especially 2001 and 2011), and Uttar Pradesh-specific figures gives you a scoring edge. Migration questions focus on rural-urban flows, seasonal labour movement, and push-pull factors.

The Census of India — conducted every 10 years since 1872 (first synchronous census 1881) — is the world's largest administrative exercise. Census 2021 was postponed due to COVID-19. Your preparation must prioritize Census 2011 data, which remains the latest official baseline for demographic questions.

Key Concepts

• **Census Operations**: Conducted by the Office of the Registrar General and Census Commissioner under the Ministry of Home Affairs. Two phases — house-listing (administrative data) and population enumeration (demographic details). Census data informs parliamentary delimitation, fund allocation, and planning.

• **Decadal Growth Rate**: Percentage change in population over 10 years. Formula: [(Population in current census – Population in previous census) / Population in previous census] × 100. India's decadal growth rate declined from 21.54% (1991–2001) to 17.64% (2001–2011), indicating demographic transition.

• **Sex Ratio**: Number of females per 1,000 males. India's overall sex ratio improved from 933 (2001) to 943 (2011). Child sex ratio (0–6 years) worsened from 927 to 918, reflecting gender bias and female foeticide despite the PCPNDT Act.

• **Literacy Rate**: Percentage of population aged 7 years and above who can read and write with understanding in any language. India's literacy rose from 64.8% (2001) to 74.0% (2011). Male literacy 82.1%, female literacy 65.5% — the gender gap narrowed but persists.

• **Density of Population**: Persons per square kilometre. India's density increased from 325 (2001) to 382 (2011). Bihar (1,102) and West Bengal (1,029) are most dense; Arunachal Pradesh (17) least dense. Uttar Pradesh density: 828 per sq km.

• **Internal Migration**: Movement within national borders. Classified as rural-to-rural (largest component, often marriage-related for women), rural-to-urban (work-driven), urban-to-urban, and urban-to-rural (small reverse flows). Census migration data tracks place of birth vs place of enumeration and last residence.

• **Push-Pull Factors**: Push factors (unemployment, poverty, natural disasters, poor services) drive out-migration; pull factors (employment, education, healthcare, urban amenities) attract in-migration. Delhi, Mumbai, Bangalore, and Hyderabad are major pull centres.

• **Seasonal Migration**: Short-term, often circular movement. Agricultural labourers migrate post-harvest; construction workers move to cities seasonally. Uttar Pradesh and Bihar are major source states; Maharashtra, Gujarat, and Punjab are destinations.

Formulas / Key Facts

1. **Decadal Growth Rate** = [(P₂₀₁₁ – P₂₀₀₁) / P₂₀₀₁] × 100 2. **Sex Ratio** = (Number of females / Number of males) × 1,000 3. **Density** = Total population / Total area in sq km 4. **Literacy Rate** = (Literate population aged 7+ / Total population aged 7+) × 100 5. **India Census 2011 Population**: 1,210 million (121 crore) — 623 million males, 587 million females. 6. **Most Populous State**: Uttar Pradesh — 199.6 million (16.5% of India's population). 7. **Least Populous State**: Sikkim — 0.6 million. 8. **Highest Sex Ratio State**: Kerala — 1,084 females per 1,000 males. 9. **Lowest Sex Ratio State**: Haryana — 877 (2011). 10. **Highest Literacy State**: Kerala — 93.9%; Lowest: Bihar — 63.8%. 11. **UP Sex Ratio**: 912 (2011); Child sex ratio: 902. 12. **UP Literacy Rate**: 69.7% (male 79.2%, female 59.3%).

Worked Examples

**Example 1: Calculate Decadal Growth Rate** A district had population 5,00,000 in 2001 and 5,80,000 in 2011. Find decadal growth rate.

*Solution:* Growth rate = [(5,80,000 – 5,00,000) / 5,00,000] × 100 = [80,000 / 5,00,000] × 100 = 0.16 × 100 = 16%

**Example 2: Determine Sex Ratio** A village has 8,200 males and 7,790 females. Calculate sex ratio.

*Solution:* Sex ratio = (Number of females / Number of males) × 1,000 = (7,790 / 8,200) × 1,000 = 0.95 × 1,000 = 950 females per 1,000 males

**Example 3: Identify Migration Pattern** Statement: A person born in Gorakhpur (UP) now lives in Mumbai for work. Classify migration type.

*Solution:*

• Inter-state migration (UP to Maharashtra).
• Rural-to-urban migration (assuming Gorakhpur rural origin, Mumbai urban).
• Work/employment-driven migration (economic pull factor).

Common Mistakes

• **Confusing sex ratio with gender ratio**: Sex ratio uses females per 1,000 males. Don't invert or use percentage. Wrong: "Sex ratio is 48%." Correct: "Sex ratio is 943 per 1,000 males."

• **Mixing overall and child sex ratio**: Child sex ratio (0–6 age group) is consistently lower than overall sex ratio due to gender bias. Don't quote overall ratio when question asks child ratio. Check which census figure the question specifies.

• **Ignoring census year**: Always note the census year. Using 2001 data when 2011 is expected (or vice versa) loses marks. Census 2011 is current baseline; 2021 data not yet released.

• **Misunderstanding literacy definition**: Literacy requires ability to read and write with understanding in *any* language, not just English or Hindi. Children below 7 years are excluded from literacy calculation.

• **Treating migration as only rural-to-urban**: Rural-to-rural migration (especially marriage migration for women) is the largest stream in India. Urban focus alone misses the complete picture.

Quick Reference

• **Census 2011**: India population 121 crore; growth rate 17.64%; sex ratio 943; literacy 74%.
• **Uttar Pradesh 2011**: Population 19.96 crore; sex ratio 912; literacy 69.7%; density 828/sq km.
• **Top 5 populous states**: UP, Maharashtra, Bihar, West Bengal, Madhya Pradesh.
• **Kerala leads**: Highest literacy (93.9%), highest sex ratio (1,084).
• **Migration streams**: Rural-to-rural > rural-to-urban > urban-to-urban > urban-to-rural.
• **Push factors**: Unemployment, poverty, disasters. **Pull factors**: Jobs, education, amenities.