Class 9: Social science: contemporary India-I: textbook in geography for class IX, 2006

Introduction

1. India's Historical Significance

• Ancient civilization.
• Significant contributor to world history.

2. Socio-Economic Progress

• Multifaceted progress over the last five decades.

3. Key Achievements

1. Agriculture
2. Industry
3. Technology
4. Overall economic development.

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Location

1. Location of India

• Situated entirely in the Northern hemisphere.
• Mainland latitude: 8°4'N to 37°6'N
• Mainland longitude: 68°7'E to 97°25'E

2. Tropic of Cancer

• Passes through India at 23° 30'N.
• Divides India into approximately two equal parts.

3. Islands of India

• Southeast of mainland: Andaman and Nicobar islands (Bay of Bengal)
• Southwest of mainland: Lakshadweep islands (Arabian Sea)
• (Note: Check atlas for exact extent of these islands.)

Size

1. Size and Global Position of India

• Area: 3.28 million square km.
• Accounts for 2.4% of the world's geographical area.
• Ranks 7th in terms of size globally.

2. Boundaries and Coastline

• Land boundary: 15,200 km.
• Total coastline (including islands): 7,516.6 km.

3. Geographic Features

• Bordered by young fold mountains in the northwest, north, and northeast.
• Tapers southwards, dividing the Arabian Sea (west) and Bay of Bengal (east).

4. Extent and Time Zone

• Latitudinal and longitudinal extent is approximately 30°.

• East-west extent appears shorter than north-south extent.

• Time difference of two hours from Gujarat to Arunachal Pradesh.

• Standard time is based on 82°30'E meridian through Mirzapur, Uttar Pradesh.

• Latitudinal extent affects the duration of day and night.

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India and the World

1. India's Strategic Position

• Central location between East and West Asia.
• The southward extension of the Asian continent.

2. Importance in Maritime Routes

• Trans-Indian Ocean routes connect Europe and East Asia, giving India a strategic advantage.
• Deccan Peninsula's protrusion facilitates connections with West Asia, Africa, Europe, Southeast, and East Asia.
• India has the longest coastline on the Indian Ocean, leading to the ocean's naming after the country.

3. Historical Contacts

• Land route interactions are older than maritime contacts.
• Northern mountain passes served as ancient travel routes.
• These routes enabled exchange of ideas and commodities.

4. Cultural and Commodity Exchange

• Exported: Upanishads, Ramayana, Panchtantra stories, Indian numerals, decimal system, spices, and muslin.

• Imported: Greek sculpture influence, dome, and minaret architectural styles from West Asia.

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India’s Neighbors

1. India's Geographical Position

• Strategic position in South Asia.
• Comprises 28 states and eight Union Territories.

2. Land Neighbours

• Northwest: Pakistan and Afghanistan.
• North: China (Tibet), Nepal, and Bhutan.
• East: Myanmar and Bangladesh.

3. Maritime Neighbours

• Sri Lanka: Separated by Palk Strait and the Gulf of Mannar.
• Maldives: South of Lakshadweep Islands.

4. Historical Links

• India has significant geographical and historical ties with neighboring countries.

• Stands distinct in the Asian continent.

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Additional Concepts

1. Suez Canal and India

• Opened in 1869.
• Reduced India's distance from Europe by 7,000 km.

2. Pre-1947 Indian States Classification

• Provinces:
  • Directly ruled by British officials appointed by the Viceroy.
• Princely States:
  • Ruled by local, hereditary rulers.
  • Acknowledged British sovereignty in exchange for local autonomy.

3. School Bhuvan Portal

• Map-based learning platform.
• Raises awareness about India's natural resources, environment, and sustainable development.
• Initiative of Bhuvan — NRSC/ISRO.

Introduction

1. Landforms in India:
   • Variety: India boasts a diverse range of landforms including mountains, plains, deserts, plateaus, and islands.
2. Peninsular Plateau:
   • Age: One of the oldest landmasses on Earth.
   • Stability: Considered one of the most stable land blocks.
   • Composition: Made up of igneous and metamorphic rocks; features gently rising hills and broad valleys.
3. Himalayas:
   • Age: Among the youngest landforms.
   • Stability: Geologically unstable zone.
   • Features: Youthful topography with high peaks, deep valleys, and rapid rivers.
4. Northern Plains:
   • Formation: Created from alluvial deposits.

Major Physiographic Divisions

1. Major Physiographic Divisions of India:

• (1) The Himalayan Mountains: Young, fold mountains that run from the Indus to the Brahmaputra in a west-east direction.

  • Comprises three parallel ranges with various valleys in between.
  • Great or Inner Himalayas (Himadri): Most continuous with an average height of 6,000 metres.
  • Lesser Himalaya (Himachal): Rugged mountain system with an altitude between 3,700 and 4,500 metres.
  • Shiwaliks: Lowest range with an altitude between 900 and 1100 metres.

• (2) The Northern Plains: Formed by the interplay of the Indus, Ganga, and Brahmaputra rivers. Fertile and agriculturally productive.

• (3) The Peninsular Plateau: Ancient landmass comprising the Central Highlands and the Deccan Plateau.

  • Central Highlands: Lies north of the Narmada River with the Vindhyan range as a notable feature.
  • Deccan Plateau: Triangular landmass south of the Narmada River, flanked by the Western and Eastern Ghats.

• (4) The Indian Desert: Sandy Plain in the west, characterized by sand dunes and low rainfall.

• (5) The Coastal Plains: Narrow strips along the Arabian Sea and Bay of Bengal.

  • Western Coastal Plains: Includes Konkan, Kannad, and Malabar coasts.
  • Eastern Coastal Plains: Features large deltas formed by rivers like Mahanadi, Godavari, Krishna, and Kaveri.

• (6) The Islands:

  • Lakshadweep Islands: Near Kerala, formed of coral islands.
  • Andaman and Nicobar Islands: Elongated chain in the Bay of Bengal, significant for biodiversity.

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Additional Concepts

1. Terminology and Geographic Features

• (1) Doab:
  • Derived from: ‘do’ (two) + ‘ab’ (water)
  • Significance: Land between two rivers.
• (2) Punjab:
  • Derived from: ‘Punj’ (five) + ‘ab’ (water)
  • Significance: Region of five rivers.
• (3) Majuli:
  • Location: Brahmaputra River.
  • Notable for: Being the largest inhabited riverine island globally.
• (4) Chilika Lake:
  • Location: Odisha, south of the Mahanadi delta.
  • Notable for: Being India's largest saltwater lake.
• (5) Barren Island:
  • Location: Andaman and Nicobar Islands.
  • Notable for: Housing India's only active volcano.

Introduction

1. Drainage Concepts

• (1) Drainage: Describes the river system of an area.
• (2) Formation: Small streams converge to form the main river which drains into larger water bodies (e.g., lake, sea, ocean).
• (3) Drainage Basin: Area drained by a single river system.
• (4) Water Divide: Elevated areas (like mountains or uplands) that separate two drainage basins.

Drainage systems in India

• Controlled by India's relief features.
• (1) Himalayan Rivers:
  • Perennial (water throughout the year).
  • Major rivers: Indus, Ganga, Brahmaputra.
  • Characteristics: Long courses, erosional activity, meanders, oxbow lakes, deltas.
• (2) Peninsular Rivers:
  • Seasonal (dependent on rainfall).
  • Major rivers: Mahanadi, Godavari, Krishna, Kaveri.
  • Characteristics: Shorter courses, deltas (for east-flowing rivers), and estuaries (for west-flowing rivers).

2. Indus River System

• Origin: Tibet (near Lake Mansarovar).
• Enters India: Ladakh.
• Tributaries: Zaskar, Nubra, Shyok, Hunza, Satluj, Beas, Ravi, Chenab, Jhelum.
• Length: 2900 km.

3. Ganga River System

• Headwaters: Bhagirathi (Gangotri Glacier).
• Major Tributaries: Yamuna, Ghaghara, Gandak, Kosi, Chambal, Betwa, Son.
• Features: Meanders, oxbow lakes, delta (Sundarban Delta).

4. Brahmaputra River System

• Origin: Tibet (east of Mansarowar lake).
• Enters India: Arunachal Pradesh.
• Characteristics: Braided channels, riverine islands, frequent flooding.

5. Peninsular Rivers

• West-flowing: Narmada, Tapi, Sabarmati, Mahi, Bharathpuzha, Periyar.

• East-flowing: Godavari, Mahanadi, Krishna, Kaveri.

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Lakes

1. Lakes in India

• (1) Introduction:
  • Famous lakes: Dal Lake in Kashmir, lakes in tourist spots like Nainital.
  • Lakes enhance tourist attractions.
• (2) Characteristics:
  • Vary in size and nature.
  • Some are permanent, while others are seasonal (e.g., in semi-arid regions).
• (3) Formation:
  • Glacial activity: Most freshwater lakes in the Himalayan region.
  • Wind, river action, human activities.
  • Oxbow lakes: Formed by meandering rivers.
  • Lagoons: Formed by spits and bars (e.g., Chilika Lake, Pulicat Lake).
  • Tectonic activity: e.g., Wular Lake (largest freshwater lake in India).
  • Human-made: Due to the damming of rivers, e.g., Guru Gobind Sagar from Bhakra Nangal Project.
• (4) Importance:
  • Flood control.
  • Maintaining even river flow.
  • Hydel power generation.
  • Climate moderation.
  • Aquatic ecosystem support.
  • Enhancing natural beauty and tourism.

Role of Rivers in the Economy

• (1) Historical Significance:
  • Rivers have always played a pivotal role in human history.
  • Riverbanks have been prime locations for ancient settlements, now evolved into major cities.
• (2) Essential Resource:
  • Rivers provide water, a fundamental natural resource for numerous human activities.
• (3) Economic Importance:
  • Irrigation: Vital for agriculture, especially in regions with inconsistent rainfall.
  • Navigation: Rivers serve as natural waterways for transportation.
  • Hydro-power Generation: Rivers are sources for generating renewable energy.
  • Settlements: Many major cities globally have evolved from settlements near rivers.
• (4) Special Mention:
  • In countries like India, rivers are especially significant due to the agricultural prominence in the economy.

River Pollution

1. River Pollution Causes

• (1) Increased Demand: Growing needs from domestic, municipal, industrial, and agricultural sectors.
• (2) Draining Rivers: Excessive water withdrawal reduces river volumes.
• (3) Sewage & Effluents: Untreated sewage and industrial wastes are discharged into rivers, affecting water quality.
• (4) Reduced Self-cleansing: Pollution hampers a river's natural ability to cleanse itself. For instance, the Ganga could naturally dilute pollutants within 20 km of large cities, but urbanization affects this ability.

2. Consequences & Remedies

• (1) Elevated Pollution Levels: Due to unchecked urbanization and industrialization.
• (2) Action Plans: Various initiatives launched to combat river pollution.
• (3) Health Impact: Polluted river water poses health risks.
• (4) Importance of Fresh Water: Reflect on the implications of a life without fresh water.

Additional Concepts

1. Global & National River Facts

• (1) Amazon River: Boasts the world's largest drainage basin.
• (2) Indus Water Treaty (1960):
  • India is entitled to only 20% of the Indus River system's water.
  • Used for irrigation in Punjab, Haryana, and parts of Rajasthan.
• (3) Namami Gange Programme:
  • Launched in June 2014 by the Union Government.
  • Aims: Pollution abatement and Ganga river rejuvenation.
• (4) Sundarban Delta:
  • Named after the Sundari tree.
  • World's largest and fastest-growing delta.
  • Habitat for the Royal Bengal tiger.
• (5) River Names:
  • Brahmaputra: Tsang Po in Tibet, Jamuna in Bangladesh.
• (6) Narmada Conservation:
  • An initiative by the Madhya Pradesh government: Namami Devi Narmade.
• (7) Kaveri River:
  • Features India's second-largest waterfall: Shivasamudram Falls.
  • Hydroelectric power from this benefits several regions including Mysuru and Bengaluru.
• (8) Global Water Statistics:
  • Earth's surface is 71% water.
  • 97% of it is salt water.
  • Of the 3% freshwater, 75% is ice.
• (9) Lakes:
  • Large lakes are termed seas (e.g., Caspian, Dead, and Aral seas).

2. National River Conservation Plan (NRCP)

• (1) Initiation:
  • Started with the Ganga Action Plan (GAP) in 1985.
• (2) Expansion:
  • By 1995, it expanded to include other rivers under NRCP.
• (3) Main Objective:
  • Enhance river water quality through pollution abatement.

Introduction

1. Introduction to Climate

• (1) Climate vs. Weather: Climate is the average weather condition over a long period (>30 years). Weather is the atmospheric state at a particular time.
• (2) Elements: Temperature, atmospheric pressure, wind, humidity, and precipitation.
• (3) Seasons: Derived from general monthly atmospheric conditions. E.g., winter, summer, rainy.

2. Indian Climate Characteristics

• (1) Monsoon Type: Predominant in South and Southeast Asia.
• (2) Regional Variations: Despite a unified pattern, there are discernible differences across regions.

3. Temperature in India

• (1) Summer: Up to 50°C in Rajasthan; around 20°C in Pahalgam, J&K.
• (2) Winter: As low as -45°C in Drass, J&K; around 22°C in Thiruvananthapuram.

4. Precipitation in India

• (1) Forms: Snowfall in the Himalayas, rainfall in the rest of the country.
• (2) Amount: Over 400 cm in Meghalaya; less than 10 cm in Ladakh and western Rajasthan.
• (3) Seasons: Majority from June to September; Tamil Nadu gets rain in October and November.

5. Coastal vs. Interior Regions

• Coastal areas have less temperature contrast. Interior regions exhibit more seasonal contrasts.
• Rainfall decreases from east to west in Northern Plains.
• Variations influence lifestyle, including food, clothing, and housing.

Climatic Controls

1. Overview

• Climatic Controls: Factors that determine the climate of any location.

2. Six Major Climatic Controls

• (1) Latitude:
  • Due to Earth's curvature, solar energy varies with latitude.
  • Temperature decreases from the equator to the poles.
• (2) Altitude:
  • The atmosphere thins with height; temperature drops.
  • Hills and high-altitude areas are cooler.
• (3) Pressure and Wind System:
  • Influenced by latitude and altitude.
  • Determines temperature and rainfall patterns.
• (4) Distance from the Sea (Continentality):
  • Proximity to sea moderates climate.
  • Areas far from the sea have extreme temperatures.
• (5) Ocean Currents:
  • Warm or cold currents can influence coastal climates.
  • Onshore winds can intensify these effects.
• (6) Relief Features (Topography):
  • Mountains can block or redirect prevailing winds.
  • Rain shadow effect on leeward sides of mountains.

Factors Affecting India’s Climate

1. Overview

• Factors Affecting India’s Climate: Elements that determine the climatic patterns of India.

2. Major Factors

• (1) Latitude:
  • The Tropic of Cancer divides India.
  • South of it: Tropical region.
  • North of it: Sub-tropical region.
  • Result: Mix of tropical & subtropical climates.
• (2) Altitude:
  • Northern mountains average about 6,000 meters.
  • Coastal regions at about 30 meters elevation.
  • Himalayas' Role: Block cold Central Asian winds; give India milder winters.
• (3) Pressure and Winds:
  • Governed by:
    • a. Surface pressure and winds.
    • b. Upper air circulation.
    • c. Cyclonic disturbances.
  • India: Region of northeasterly winds.
  • Winter: High-pressure north of the Himalayas, cold dry winds flow south.
  • Summer: Low pressure in interior Asia & northwest India.
  • Southwest Monsoon: Winds reverse, come from the sea, and bring widespread rainfall.

The Seasons

1. Overview

• India experiences distinct seasonal patterns due to its monsoon climate. The coastal areas show less variation, while the interiors show prominent changes.

2. Seasons in India

• (1) Cold Weather Season (Winter)

  • Time: Mid-November to February.
  • North India experiences the coldest months in December & January.
  • Temperature gradient: Decreases from south to north.
  • Predominant winds: Northeast trade winds. Dry for most parts but brings rainfall to the Tamil Nadu coast.
  • Northern plains receive winter rains, important for 'rabi' crops.

• (2) Hot Weather Season (Summer)

  • Time: March to May.
  • Due to the northward movement of the sun, heat increases.
  • High temperatures throughout, especially in northwestern parts.
  • Phenomena: 'Loo' winds, dust storms, and localized thunderstorms.

• (3) Advancing Monsoon (Rainy Season)

  • Starts: Early June.
  • Characterized by the southwest monsoon winds bringing heavy rainfall.
  • Notable features: Monsoon breaks, and fluctuations in rainfall. Heavy rains can lead to floods.
  • Variability leads to disruptions for farmers.

• (4) Retreating Monsoon (Transition Season)

  • Time: October-November.
  • Marked by the withdrawal of the southwest monsoon.
  • Features: 'October heat'. The transition from rainy to dry conditions.
  • Cyclonic depressions from the Andaman Sea bring rain to the eastern coasts.

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Distribution of Rainfall

1. Distribution of Rainfall in India

• (1) High Rainfall Areas:

  • Western coast and northeastern India.
  • Receive over 400 cm annually.

• (2) Low Rainfall Areas:

  • Western Rajasthan, parts of Gujarat, Haryana, and Punjab.
  • Rainfall is less than 60 cm.
  • Interior Deccan plateau and east of the Sahyadris also receive low rainfall.
  • Around Leh in Jammu and Kashmir.

• (3) Moderate Rainfall Areas:

  • The majority of the country.

• (4) Snowfall:

  • Restricted to the Himalayan region.

• (5) Variability:

  • Annual rainfall varies year to year.
  • High variability in low rainfall areas.
  • High-rainfall areas are prone to floods.
  • Low-rainfall areas are prone to droughts.

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Monsoon as a Unifying Bond

• (1) Protective Role of Himalayas:
  • Shields India from extremely cold Central Asian winds.
  • Results in higher temperatures in northern India.
• (2) Peninsular Plateau Influence:
  • Surrounded by seas on three sides leading to moderate temperatures.
• (3) Temperature Variations:
  • Despite moderating influences, India sees significant temperature differences.
• (4) Unifying Influence of Monsoon:
  • Brings a rhythmic cycle of seasons.
  • Uncertainty and uneven distribution are monsoon characteristics.
• (5) Cultural and Agricultural Influence:
  • Indian landscape, flora, fauna, agriculture, and festivities revolve around the monsoon.
• (6) Eager Anticipation:
  • People across India await the monsoon's arrival every year.
• (7) Water's Unifying Role:
  • Monsoon provides water, initiating agricultural activities.
  • River valleys unite the country, functioning as a single unit.

Additional Concepts

1. Origin of the term 'Monsoon'

• Derived from the Arabic word ‘Musam’, meaning 'season'.
• Represents seasonal wind direction reversal.

2. Temperature Fluctuations

• (a) Day and Night Variations in Thar Desert:
  • Day temperatures can rise to 50°C.
  • Night temperatures can drop to around 15°C.
• (b) Minimal Variations in Coastal Regions:
  • Places like Andaman and Nicobar Islands or Kerala have negligible day-night temperature differences.

3. Coriolis Force

• Caused by Earth's rotation.
• Deflects winds to the right in the northern hemisphere and left in the southern hemisphere.
• Also termed 'Ferrel’s Law'.

4. Mawsynram

• Recognized as the wettest place on Earth.
• Known for its stalagmite and stalactite caves.

Introduction

1. India's Bio-diversity

• India ranks among the 12 mega bio-diversity countries globally.
• Positioned 10th in the world and 4th in Asia concerning plant diversity.
• Boasts around 47,000 plant species.
• Contains approximately 15,000 flowering plants, which is 6% of the world's total.
• Home to nearly 90,000 animal species.
• Abundant fish species in both fresh and marine waters.

2. Natural Vegetation

• Plants that grow without human intervention.
• Remained untouched by humans for extended durations.
• Distinct from cultivated crops and orchards.

3. Flora and Fauna

• 'Flora' denotes plants of a specific region or time.
• 'Fauna' refers to animal species of a particular region.

Types of Vegetation

1. Types of Vegetation in India

• Tropical Evergreen Forests: Found in high rainfall areas, such as the Western Ghats, islands, and parts of Assam. Characterized by tall trees and greenery throughout the year.

  • Notable trees: Ebony, mahogany, rosewood, rubber, cinchona.
  • Common animals: Elephant, monkey, lemur, deer, one-horned rhinoceros.

• Tropical Deciduous Forests: Most widespread in India, categorized as moist (200-100 cm rainfall) and dry (100-70 cm rainfall).

  • Prominent trees: Teak, bamboo, sal, shisham, sandalwood.
  • Fauna includes Lion, tiger, pig, deer, elephant, a variety of birds, lizards, and snakes.

• Thorn Forests and Scrubs: Located in areas with less than 70 cm of rainfall. Dominated by thorny trees and bushes.

  • Main plants: Acacias, palms, euphorbias, cacti.
  • Typical animals: Rats, mice, rabbits, fox, wolf, tiger, lion, wild ass, camels.

• Montane Forests: Found in mountainous areas with varied vegetation due to altitude changes.

  • Wet temperate: 1000-2000 metres, with trees like oaks and chestnuts.
  • Temperate forests: 1500-3000 metres, containing coniferous trees such as pine, deodar, and fir.
  • Alpine vegetation: Above 3,600 metres, including silver fir, junipers, pines, birches, and alpine grasslands.
  • Common animals: Kashmir stag, spotted deer, wild sheep, jackrabbit, Tibetan antelope, yak, snow leopard.

• Mangrove Forests: Located in coastal regions influenced by tides.

  • Notable trees: Sundari, palm, coconut, keora, agar.
  • Found in deltas like Ganga, Mahanadi, Krishna, Godavari, Kaveri

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Wildlife

1. India's Rich Fauna

• Approx. 90,000 animal species.
• 2,000 bird species (13% of the world's total).
• 2,546 fish species (12% of the world's stock).
• 5-8% of global amphibians, reptiles, and mammals.

2. Notable Animals

• Mammals: Elephants (Assam, Karnataka, Kerala), one-horned rhinoceroses (Assam, West Bengal), wild ass (Rann of Kachchh), camels (Thar Desert), bison, nilgai, chousingha, gazel, monkeys.
• Big Cats: India has both tigers (Madhya Pradesh, Sundarbans, Himalayas) and lions (Gir forest, Gujarat). Leopards were also prevalent.
• Aquatic: Turtles, crocodiles, gharials.
• Birds: Peacocks, pheasants, ducks, parakeets, cranes, pigeons.

3. Himalayan Fauna

• Yak, Tibetan antelope, bharal, wild sheep, kiang, ibex, bear, snow leopard, red panda.

4. Conservation Challenges

• Imbalance in the ecosystem due to human activities.
• 1,300 plant species endangered; 20 extinct.
• Threat causes: Hunting, pollution, habitat destruction, alien species introduction.

5. Conservation Efforts

• 18 biosphere reserves; 12 in the world network.

• Projects: Tiger, Rhino, Great Indian Bustard.

• 103 National Parks, 563 Wildlife sanctuaries, and Zoological gardens.

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Additional Concepts

1. Vegetation Types

• Endemic/Indigenous: Original vegetation of India.
• Exotic: Plants that came from outside India.

2. Medicinal Plants

• Historical Context: India known for herbs/spices since ancient times.
• Ayurveda: Describes ~2,000 plants; 500 regularly used.
• Conservation: 352 medicinal plants on the World Conservation Union's Red List.
• Examples:
  • Sarpagandha: Treats blood pressure.
  • Jamun: Vinegar from ripe fruit has digestive properties; seed powder controls diabetes.
  • Arjun: Juice for earache and regulating blood pressure.
  • Babool: Leaves for eye sores; gum as a tonic.
  • Neem: Antibiotic and antibacterial properties.
  • Tulsi: Cures cough and cold.
  • Kachnar: Treats asthma, ulcers; buds/roots for digestion.

3. Wildlife Protection

• Wildlife Protection Act: Implemented in India in 1972.

4. Migratory Birds

• Wetlands: Popular with migratory birds in winter.
• Siberian Crane: Visits India during winter.
• Rann of Kachchh: Migratory destination for flamingos.

Introduction

1. Importance of Humans

• Humans give meaning to resources and events.
• Coal, a mere rock, becomes a resource through human technology.
• Natural events (e.g., Tsunamis) are termed 'disasters' when impacting human settlements.

2. Human Perspective in Social Studies

• Population is a pivotal element.
• 'Resources', 'calamities', and 'disasters' derive significance in relation to human beings.

3. Human Role

• Humans are both producers and consumers of Earth's resources.
• Vital to understand population: numbers, distribution, growth, and characteristics.

4. Census Data

• Provides information about a country's population.

Population, Size, and Distribution

1. Population Size and Numbers

• India's population (2011): 1,210.6 million (17.5% of global population).
• India's area: 3.28 million square km (2.4% of global area).
• Uttar Pradesh: Most populous state (199 million, 16% of India's population).
• Sikkim and Lakshadweep: Among the least populated areas.
• 50% of India's population is in five states: Uttar Pradesh, Maharashtra, Bihar, West Bengal, and Andhra Pradesh.
• Rajasthan: Largest state by area but holds only 5.5% of India's population.

2. Population Density

• Density: Number of persons per unit area.

• India's density (2011): 382 persons/sq km.

• Bihar: Highest density (1,102 persons/sq km).

• Arunachal Pradesh: Lowest density (17 persons/sq km).

• Factors affecting low density: Rugged terrain, unfavorable climates.

• Moderate densities: Assam and many Peninsular states due to terrain and soil conditions.

• High densities: Northern plains and Kerala due to fertile soils and good rainfall.

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Population Growth and Process of Population Change

1. Population Dynamics

• Population changes due to births, deaths, and migrations.
• Population Growth: Change in population over time.
  • India's population (2011): 1,210 million.
  • The growth rate decreased since 1981 but the absolute number added is still high.

2. Processes of Population Change

• Birth Rates: Number of live births per thousand persons annually.
  • High birth rates have always exceeded death rates in India.
• Death Rates: Number of deaths per thousand persons annually.
  • The decline in death rates previously led to high population growth.
• Migration: Movement of people across regions.
  • Can be internal or international.
  • Influences population distribution.
  • In India, major migration is from rural to urban due to push (adverse rural conditions) and pull (urban opportunities) factors.
  • The urban population rose from 17.29% (1951) to 31.80% (2011).

3. Adolescent Population

• Adolescents (10-19 years) make up one-fifth of India's population.
• Nutrition is crucial for this age group; many face nutritional deficiencies.
• A significant number of adolescent girls suffer from anemia.

4. National Population Policy (NPP) 2000

• Recognizes family planning for individual health and welfare.

• Aims:

  • Free, compulsory school education up to 14 years.
  • Reduce infant mortality rate below 30 per 1000 live births.
  • Universal child immunization against vaccine-preventable diseases.
  • Promote delayed marriage for girls.
  • Make family welfare people-centric.

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Additional Concepts

1. Census Overview

• Definition: Official, periodic population count.
• India's Census History:
  • Initial Census: 1872 (not complete).
  • First Complete Census: 1881.
  • Frequency: Every 10 years.

2. Significance of Census

• Offers comprehensive demographic, social, and economic data.
• A valuable reference for various sectors and research.

3. Global Comparison

• Only Bangladesh and Japan have higher average population densities than India.

4. Recent Changes in India's Administrative Units

• 2014: Telangana became India's 29th state.
• 2019: Jammu and Kashmir bifurcated into two union territories - Jammu and Kashmir, and Ladakh.