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Industrial Centres and Disparities | ISC Class 12

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GeographyISC Class 12 · Location and Distribution of Industrial Centres

Industrial Centres of India and Regional Disparities (ISC Class 12 Geography)

Updated 18 October 2026 · Fact-checked

India's industries cluster in a few regions: Mumbai-Pune, Hooghly, Gujarat, Chota Nagpur, Bengaluru-Chennai-Coimbatore, Gurugram-Delhi-Meerut and Visakhapatnam-Guntur, with isolated centres such as Kanpur and Indore. Maharashtra, Gujarat, Tamil Nadu and Karnataka are developed, while Bihar, eastern Uttar Pradesh and the north-east lag behind because of uneven resources, infrastructure, history and policy.

Understand Industrial Centres of India and Regional Disparities

1. Major industrial regions

1. *Mumbai-Pune* (Maharashtra): cotton textiles, engineering, chemicals, petrochemicals, automobiles, pharmaceuticals, IT, film.
2. *Hooghly* (West Bengal): jute, engineering, chemicals, paper around Kolkata and Howrah; Haldia (petrochemicals).
3. *Gujarat* (Ahmedabad-Vadodara-Surat-Jamnagar): cotton textiles, petrochemicals and refineries, chemicals, diamonds, pharmaceuticals.
4. *Chota Nagpur* (Jharkhand, Odisha, West Bengal, Chhattisgarh): iron and steel (Jamshedpur, Bokaro, Rourkela, Durgapur), heavy engineering, coal-based power.
5. *Bengaluru-Chennai-Coimbatore*: electronics, software, aircraft, automobiles, textiles.
6. *Gurugram-Delhi-Meerut*: automobiles, electronics, light engineering, agro-processing.
7. *Visakhapatnam-Guntur*: steel, shipbuilding, refinery, fertilisers.

Isolated centres: Kanpur, Indore, Nagpur, Bhilai, Kochi, Bhubaneswar, Hyderabad.

General pattern. Industries concentrate around the large port cities (Mumbai, Kolkata, Chennai), the mineral belt of the north-east Peninsula and the capital region, with growing dispersal along highway corridors.

2. Regional disparities

  • *Developed*: Maharashtra, Gujarat, Tamil Nadu, Karnataka, Haryana and the Delhi region; also parts of West Bengal, western Uttar Pradesh and Telangana.
  • *Backward*: Bihar, much of eastern Uttar Pradesh, the interior of Odisha, the north-eastern states, Jammu and Kashmir, Himachal Pradesh, the interior of Madhya Pradesh and the desert districts of Rajasthan.

3. Causes of uneven development

1. Uneven availability of raw materials, power, water, capital and skilled labour.
2. Colonial legacy: industry grew around port cities and their hinterlands.
3. Better infrastructure in developed regions.
4. Agglomeration and industrial inertia reinforce existing centres.
5. Market size and purchasing power concentrated in large cities.
6. Difficult terrain, poor accessibility, political instability or insecurity.
7. Differences in state policies and governance.

4. Consequences. Income and employment gaps between states; migration from backward to developed regions; congestion and pollution in industrial centres.

5. Measures to reduce disparities. Public sector plants in backward areas (Bhilai, Rourkela, Bokaro); licensing and concessions for backward districts; growth centres and industrial estates; special packages for the north-east and hill states; industrial corridors and SEZs; better infrastructure and skills in backward regions.

6. A disparity sum (imaginary). State A has 90 factories per lakh sq km and state B has 15. Ratio = 90 / 15 = 6. If state B adds 30 factories without a change in A, B has 45 factories per lakh sq km, i.e. 45 / 90 x 100 = 50% of A's level, narrowing the gap from 75 to 45 factories per lakh sq km. (Figures invented.)

Industrial Centres of India and Regional Disparities: key facts

Industrial regions
  • Mumbai-Pune
  • Hooghly
  • Gujarat
  • Chota Nagpur
  • Bengaluru-Chennai-Coimbatore
  • Gurugram-Delhi-Meerut
  • Visakhapatnam-Guntur
Seven.
Causes of disparity
  • Uneven resources
  • Colonial legacy
  • Infrastructure
  • Inertia and agglomeration
  • Market
  • Terrain and insecurity
  • Policy
Seven.
Remedies
  • Public sector plants
  • Concessions
  • Growth centres
  • Special packages
  • Corridors and SEZs
  • Infrastructure and skills
Six.

How to answer Industrial Centres of India and Regional Disparities questions

Use this routine for questions on industrial regions and disparities.

  1. 1Name the region, its states or cities, and two industries.
  2. 2For disparities, give causes first and then consequences and measures.
  3. 3Use state names correctly as developed or backward.
  4. 4On a map question, mark the centres named and label the industries.

Industrial Centres of India and Regional Disparities in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Why a cluster grows

Suppose a car-assembly plant opens near Chennai, and component makers, a training institute and logistics firms follow within a few years.

Name the processes that make the region stronger.

Try it first, then show the solutionSolution
  1. Industries share suppliers, services and workers: agglomeration.
  2. Once established, they stay: industrial inertia.

Answer: Agglomeration economies and industrial inertia.

Memory hook: Success attracts success.

Tricks to remember Industrial Centres of India and Regional Disparities

Short memory aids. Say each one aloud once, then use it on a question the same day.

  • M-H-G-C-B-D-V

    Mumbai-Pune, Hooghly, Gujarat, Chota Nagpur, Bengaluru, Delhi, Visakhapatnam.

    Use it when: Seven regions.

  • Ports, minerals, capital

    Industry clusters around ports, the mineral belt and the capital region.

    Use it when: General pattern.

Industrial Centres of India and Regional Disparities: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Match the centre · 1 mark · MCQBoard level

Jamshedpur, Bokaro, Rourkela and Durgapur belong to the industrial region of:
(a) Hooghly (b) Gujarat (c) Chota Nagpur (d) Mumbai-Pune

Try it first, then show the solutionSolution
  1. They are iron and steel centres of the Chota Nagpur region.

Answer: (c)

Example 2: Causes of disparity · 2 marks · Short answerBoard level

State two reasons why industries are unevenly distributed in India.

Try it first, then show the solutionSolution
  1. Uneven availability of raw materials, power, water, capital and skilled labour.
  2. Colonial legacy: industry grew around port cities and better infrastructure reinforces existing centres.

Answer: Uneven resources; colonial legacy and infrastructure.

Example 3: Closing the gap · 4 marks · Short answerHarder board level

State A has 90 factories per lakh sq km and state B 15. Calculate the ratio, B's level after adding 30 per lakh sq km, B as a percentage of A, and the gap before and after.

Try it first, then show the solutionSolution
  1. Ratio = 90 / 15 = 6.
  2. B after = 15 + 30 = 45 per lakh sq km.
  3. B as a percentage of A = 45 / 90 x 100 = 50%.
  4. Gap before = 90 - 15 = 75; after = 90 - 45 = 45.

Answer: Ratio 6; B at 45, 50% of A; gap from 75 to 45.

Example 4: Region and industries · 4 marks · Short answerHarder board level

Name four industrial regions of India and two industries of each.

Try it first, then show the solutionSolution
  1. Mumbai-Pune: cotton textiles and automobiles.
  2. Hooghly: jute and engineering.
  3. Chota Nagpur: iron and steel and heavy engineering.
  4. Bengaluru-Chennai-Coimbatore: electronics and software.

Answer: Four regions with two industries each.

Example 5: Develop a backward region · 8 marks · Long answerHOTS / competency

Suppose a north-eastern or interior state wants to catch up industrially. Identify the likely causes of its backwardness and propose six measures, linking each to the chapter.

Try it first, then show the solutionSolution
  1. Causes: difficult terrain and poor accessibility, weak infrastructure, small markets, limited capital and skills.
  2. Public sector plants and growth centres in the region, as at Bhilai, Rourkela and Bokaro.
  3. Concessions and special packages for backward districts and hill states.
  4. Industrial estates, corridors and SEZs with power, water and roads.
  5. Training institutes to raise skills and attract labour-intensive or footloose industries.
  6. Better governance and security.
  7. Limitation: agglomeration and inertia favour existing centres, so support must be sustained.

Answer: Causes identified and six measures from public sector plants to infrastructure and skills.

Where students lose marks in Industrial Centres of India and Regional Disparities

The slips examiners see most often, and what to write instead.

  • Mistake: Wrong industries for a region

    Regions have characteristic industries.

    Wrong working

    Hooghly: iron and steel.

    Right working

    Hooghly: jute and engineering; Chota Nagpur: iron and steel.

    Do this: Learn the table.

    Usually costs: 1 mark.

  • Mistake: Causes of disparity as a list of states

    Causes are reasons.

    Wrong working

    Bihar and Odisha are backward.

    Right working

    Backward due to lack of infrastructure, capital, skills and markets, and colonial legacy.

    Do this: Give reasons.

    Usually costs: 2 marks.

  • Mistake: Forgetting measures

    Questions often ask for remedies.

    Wrong working

    Only causes given.

    Right working

    Add public sector plants, concessions, corridors and infrastructure.

    Do this: End with remedies.

    Usually costs: 1-2 marks.

Exam tips

  • Be ready to explain why Haldia was established (to decongest silting Kolkata port) and which industries grew there (refinery, petrochemicals, fertilisers).
  • Mark centres on a map and write the industry beside each.
  • Cover causes, consequences and measures of disparity.
  • Use state names as given in the chapter.

Practice questions on Industrial Centres of India and Regional Disparities

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

  1. Q1 · 1 mark · Very short answerBoard level

    Name two industries of the Gujarat industrial region.

    Hint

    Textiles and petrochemicals.

    Answer

    Cotton textiles and petrochemicals (also chemicals, diamonds, pharmaceuticals).

  2. Q2 · 1 mark · Very short answerBoard level

    Name two industrially backward regions of India.

    Hint

    North-east.

    Answer

    Any two: Bihar, eastern Uttar Pradesh, interior Odisha, the north-eastern states.

  3. Q3 · 2 marks · Short answerHarder board level

    State two consequences of regional disparities in industrial development.

    Hint

    Income and migration.

    Answer

    Income and employment gaps between states, and migration from backward to developed regions (also congestion and pollution in industrial centres).

  4. Q4 · 4 marks · Short answerHarder board level

    A backward district receives 6 industrial units a year for 5 years, each employing 220 workers. Calculate the total new jobs, and how many units it would need in total to create 10,000 jobs.

    Hint

    Units times workers.

    Answer

    Units = 6 x 5 = 30; jobs = 30 x 220 = 6,600. For 10,000 jobs: 10,000 / 220 = 45.5, so 46 units in all.

  5. Q5 · 4 marks · Short answerHOTS / competency

    A planner says that building steel plants alone will remove regional disparities. Evaluate using the causes and measures in the chapter.

    Hint

    One measure is not enough.

    Answer

    Public sector plants in backward areas, as at Bhilai, Rourkela and Bokaro, help, but disparities have many causes: infrastructure, markets, skills, terrain, policy and the pull of existing clusters. Measures such as concessions, industrial estates, corridors, special packages and infrastructure and skills are also needed, so steel plants alone are not enough.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

  1. 1.Which region has Haldia?Show answer

    The Hooghly region (petrochemicals).

  2. 2.Name an isolated industrial centre.Show answer

    Kanpur, Indore, Nagpur, Bhilai, Kochi, Bhubaneswar or Hyderabad.

  3. 3.Which region has Jamshedpur?Show answer

    Chota Nagpur.

  4. 4.Name a developed industrial state.Show answer

    Maharashtra, Gujarat, Tamil Nadu, Karnataka or Haryana.

Industrial Centres of India and Regional Disparities: frequently asked questions

Are the lists of backward states fixed?

Learn them as on the chapter page; economic conditions change over time.

What is a growth centre?

A planned industrial centre developed in a backward area to attract industries.

Where are the factors of location covered?

On the factors of industrial location topic page.