Chapter 6: Manufacturing Industries

Geography · CBSE Class 10 · Contemporary India-II

📖 Chapter 6: Manufacturing Industries (CBSE Class 10 Geography — Contemporary India-II). What manufacturing is and why it matters, how industries are classified, the major agro-based and mineral-based industries, and industrial pollution with its control.

1. What is Manufacturing & Why it Matters

Manufacturing = production of goods in large quantities by processing raw materials into more valuable finished products (a secondary-sector activity). The economic strength of a country is measured by its manufacturing development.

🎯 Importance: manufacturing modernises agriculture and reduces dependence on it by creating jobs in secondary/tertiary sectors; is a precondition for eradicating unemployment and poverty (idea behind public-sector industries, also to reduce regional disparity); expands trade and brings foreign exchange; and converting raw materials into high-value goods brings prosperity. Agriculture and industry move hand in hand (agro-industries raise farm productivity).

2. Classification of Industries

Basis	Types
Raw materials	Agro-based (cotton, jute, silk, sugar, tea, coffee, edible oil) and Mineral-based (iron & steel, cement, aluminium, petrochemicals)
Main role	Basic/key (supply raw materials to other industries — iron & steel, copper/aluminium smelting) and Consumer (direct use — sugar, toothpaste, paper, fans)
Capital investment	Small scale (max investment limit, e.g. ₹1 crore) vs large scale
Ownership	Public (BHEL, SAIL), Private (TISCO, Bajaj, Dabur), Joint (Oil India Ltd.), Cooperative (sugar in Maharashtra, coir in Kerala)
Bulk & weight	Heavy (iron & steel) and Light (electrical goods)

3. Agro-Based Industries

Textile Industry

The textile industry has a unique position — it contributes to industrial production, employment and foreign exchange, and is the only industry self-reliant and complete in the value chain (raw material → highest value-added product).

Cotton textiles: first successful mill in Mumbai (1854); early concentration in the cotton belt of Maharashtra & Gujarat (raw cotton, market, transport, port, labour, moist climate). Spinning is centralised (Maharashtra, Gujarat, Tamil Nadu) but weaving is decentralised (handloom, powerloom, mills). India is world-class in spinning but weaving yields lower-quality fabric. Khadi gives large-scale cottage employment.
Jute textiles: first mill at Rishra near Kolkata (1855); India is the largest producer of raw jute & jute goods and 2nd exporter after Bangladesh. Mills concentrate along the Hugli river (West Bengal) — jute-growing areas, cheap water transport, rail/road network, abundant water, cheap labour, Kolkata's banking/port.

Sugar Industry

India is 2nd in sugar but 1st in gur & khandsari. Raw material (cane) is bulky and loses sucrose in haulage → seasonal, ideal for the cooperative sector. 60% of mills in UP & Bihar; shifting to Maharashtra and the south (higher sucrose, longer crushing season, successful cooperatives).

4. Mineral-Based Industries

Iron and Steel Industry

The basic industry — all others depend on it for machinery; steel production/consumption is an index of development. A heavy industry (bulky raw materials and products → high transport cost). Inputs: iron ore, coking coal and limestone ≈ 4 : 2 : 1, plus manganese to harden steel. The Chhotanagpur plateau has maximum concentration (low-cost iron ore, high-grade raw materials nearby, cheap labour, home market).

Aluminium Smelting

2nd most important metallurgical industry; aluminium is light, corrosion-resistant, a good conductor, malleable → aircraft, utensils, wires (substitute for steel/copper). Raw material: bauxite (bulky). Plants in Odisha, WB, Kerala, UP, Chhattisgarh, Maharashtra, TN; key factors: regular electricity and assured low-cost raw material.

Chemical, Fertiliser, Cement, Automobile & IT

Industry	Key facts
Chemical	Fast-growing; inorganic (sulphuric acid, soda ash, caustic soda) & organic (petrochemicals — near oil refineries); its own largest consumer
Fertiliser	Nitrogenous (urea), phosphatic, complex (N-P-K); potash entirely imported; Gujarat, TN, UP, Punjab, Kerala ≈ half the output
Cement	Needs bulky limestone, silica, gypsum + coal/power; first plant Chennai (1904); Gujarat plants export to the Gulf
Automobile	Grew after liberalisation; around Delhi, Gurugram, Mumbai, Pune, Chennai, Kolkata, Jamshedpur, Bengaluru
IT & Electronics	Bengaluru = electronic capital of India; also Noida, Mumbai, Chennai, Hyderabad, Pune; big employer; hardware + software

5. Industrial Pollution & Its Control

🎯 Industries cause four types of pollution: Air (SO₂, CO, smoke; e.g. the Bhopal Gas tragedy), Water (organic/inorganic effluents — paper, chemical, textile, refineries, tanneries release dyes, acids, heavy metals like lead/mercury), Land (dumping of glass, chemicals, effluents; water then carries pollutants to groundwater), and Noise (machinery, generators, drills — causes stress and hearing loss). Thermal pollution of water comes from hot water drained before cooling.

Control of Environmental Degradation

Water: minimise use by reusing/recycling; harvest rainwater; treat hot water and effluents before release. Effluent treatment in three phases — primary (mechanical: screening, sedimentation), secondary (biological), tertiary (chemical/physical, recycling).
Air: fit smokestacks with electrostatic precipitators, fabric filters, scrubbers, inertial separators; use oil/gas instead of coal.
Noise: silencers on generators, redesigned machinery, ear plugs.
Regulate overdrawing of groundwater legally. NTPC is cited as a model (ISO 14001 EMS — ash utilisation, green belts, ash-water recycling).

📘 NCERT Textbook Exercise Answers

1Multiple choice: (i) Which industry uses bauxite as a raw material? (a) Aluminium Smelting (b) Cement (c) Paper (d) Steel. (ii) Which industry manufactures telephones, computers, etc.? (a) Steel (b) Electronic (c) Aluminium Smelting (d) Information Technology.

(i) (a) Aluminium Smelting — bauxite is the ore from which aluminium is obtained. (ii) (b) Electronic — the electronics industry makes telephones, computers, TVs, etc.

2(i) What is manufacturing? (ii) What are basic industries? Give an example.

(i) Manufacturing is the production of goods in large quantities by processing raw materials into more valuable finished products (a secondary-sector activity) — e.g. paper from wood, steel from iron ore. (ii) Basic (or key) industries are those whose products serve as raw materials for manufacturing other goods. Example: the iron and steel industry (its steel is used by other industries), or copper/aluminium smelting.

3(i) How do industries pollute the environment? (ii) Discuss the steps to be taken to minimise environmental degradation by industry.

(i) Industrial pollution is of four kinds: Air pollution from undesirable gases (SO₂, CO) and smoke from factories/refineries/smelters (e.g. the Bhopal Gas tragedy); Water pollution from organic/inorganic effluents — dyes, acids, heavy metals (lead, mercury) released by paper, chemical, textile and tannery units, plus thermal pollution from hot water; Land pollution from dumping glass, chemicals and effluents (which seep into groundwater); and Noise pollution from machinery, generators and drills. (ii) Steps to minimise degradation: minimise water use by reusing and recycling; harvest rainwater; treat effluents in three phases (primary mechanical, secondary biological, tertiary chemical/physical); regulate overdrawing of groundwater legally; reduce air pollution with electrostatic precipitators, fabric filters, scrubbers and by using oil/gas instead of coal; and cut noise with silencers, redesigned machinery and ear plugs.

🔥 Extra Practice — Very Difficult / HOTS (competency-based, source & case-based, assertion-reason)

A. Source-/Case-Based Questions

1Case: Jute mills in India are concentrated in a narrow belt along the banks of the Hugli river in West Bengal. (i) Name two location factors. (ii) Where does the cheap labour come from? (iii) How does Kolkata help the industry?

(i) Any two: proximity to the jute-growing areas, inexpensive water transport supported by rail/road/waterways, abundant water for processing, and cheap labour. (ii) From West Bengal and the adjoining states of Bihar, Odisha and Uttar Pradesh. (iii) Kolkata, a large urban centre, provides banking, insurance and port facilities for the export of jute goods.

2Case: Sugarcane is bulky, loses its sucrose content in haulage, and the sugar industry is seasonal; recently mills are shifting to Maharashtra and the south. (i) Why is the industry suited to the cooperative sector? (ii) Why are mills shifting south/west? (iii) Why must mills be located close to the cane fields?

(i) Because it is seasonal and cane-growers can pool resources and share profits/losses — cooperatives have been successful in running such mills. (ii) The cane there has higher sucrose content, the cooler climate gives a longer crushing season, and cooperatives are more successful. (iii) Cane is bulky and loses sucrose the longer it is transported, so mills must be near the fields to process it quickly.

3Case: Iron and steel needs iron ore, coking coal and limestone in the ratio ~4:2:1 (plus manganese), and the Chhotanagpur plateau has the maximum concentration of such industries. (i) Why is it a ‘heavy’ industry? (ii) Give two reasons Chhotanagpur is favoured. (iii) Why is steel production an ‘index of development’?

(i) Because both the raw materials and the finished goods are heavy and bulky, entailing heavy transport costs. (ii) Low-cost iron ore and high-grade raw materials in proximity, plus cheap labour and a large home market. (iii) Because steel is the basic material for machinery, construction, defence and consumer goods — all other industries depend on it, so a country's steel output reflects its overall industrial development.

B. Assertion–Reason (a = both true & R explains A; b = both true, R does not explain A; c = A true, R false; d = A false, R true)

4Assertion (A): Potash is entirely imported for India's fertiliser industry. Reason (R): India does not have commercially usable reserves of potash or potassium compounds.

(a) Both true and R explains A. India lacks commercial potash reserves (R), which is exactly why the potash component of fertilisers is entirely imported (A).

5Assertion (A): Manufacturing reduces people's dependence on agriculture. Reason (R): It provides jobs only in the primary sector.

(c) A is true, R is false. Manufacturing does reduce dependence on agriculture (A true), but it does so by providing jobs in the secondary and tertiary sectors, not the primary sector — so R is false.

6Assertion (A): Thermal pollution of water harms aquatic life. Reason (R): Hot water from factories and thermal plants is drained into rivers and ponds before cooling.

(a) Both true and R explains A. Draining uncooled hot water (R) raises water temperature and reduces dissolved oxygen, harming aquatic organisms — so R explains A.

C. Analytical / 5-mark

7‘Manufacturing is the backbone of economic development.’ Justify with at least four reasons.

(1) Manufacturing modernises agriculture (agro-industries supply pumps, fertilisers, machinery) and raises farm productivity. (2) It reduces dependence on agricultural income by creating jobs in the secondary and tertiary sectors, helping eradicate unemployment and poverty and reduce regional disparity (the aim of public-sector industries in backward/tribal areas). (3) Export of manufactured goods expands trade and brings in foreign exchange. (4) Transforming raw materials into a wide variety of higher-value finished goods makes a country prosperous and competitive in the global market. Hence a country's economic strength is measured by its manufacturing development.

8Picture-the-scenario: A new industrial estate is polluting a nearby river and the air. As a planner, propose a complete pollution-control plan covering water, air and noise.

Water: minimise use by reusing/recycling water in successive stages, harvest rainwater, and treat all effluents before release in three phases — primary (mechanical: screening, flocculation, sedimentation), secondary (biological), and tertiary (chemical/physical with recycling); never drain hot water uncooled; legally regulate groundwater overdrawing. Air: fit smokestacks with electrostatic precipitators, fabric filters, scrubbers and inertial separators, and switch from coal to oil or gas. Noise: fit silencers on generators, redesign machinery for efficiency, use noise-absorbing material and ear plugs. Finally, integrate economic growth with environmental concern — optimum equipment, ash utilisation, green belts and ecological monitoring (as NTPC does with ISO 14001).