This MCQ module is based on: Chapter 2 Summary, Map Work & Exercises
TOPIC 5 OF 17
Chapter 2 Summary, Map Work & Exercises
🎓 Class 11
Social Science
CBSE
Theory
Ch 2 — Structure and Physiography
⏱ ~18 min
🌐 Language: [gtranslate]
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Chapter 2 · Summary, Key Terms & Exercises
A consolidated revision pack for "Structure & Physiography" — chapter highlights, a glossary of key terms, NCERT-style multiple-choice and short-answer drills, project work and a map exercise to help you tie India's geological story to its physical map.
Chapter Summary — At a Glance
🌍 The Geological Framework
- Earth is approximately 4,600 million years old; today's surface reflects the long interplay of endogenic and exogenic forces plus the lateral drift of plates.
- The Indian plate started south of the Equator, broke away from the Australian plate, and has drifted north for tens of millions of years — a movement that still continues.
- India is divided into three geological divisions: (i) Peninsular Block; (ii) Himalayas & other Peninsular Mountains; (iii) Indo-Ganga-Brahmaputra Plain.
- The Peninsular Block is built of very ancient gneisses and granites, has stood essentially undisturbed since the Cambrian, and shows rift valleys (Narmada, Tapi, Mahanadi) and block-faulted ranges (Satpura).
- The Himalayas are young, weak and flexible — still rising; their fast rivers cut gorges, V-shaped valleys, rapids and waterfalls.
- The Indo-Ganga-Brahmaputra Plain began as a geo-synclinal trough during the third phase of Himalayan orogeny (~64 mn yrs ago); alluvium today averages 1,000–2,000 m thick.
🏞 The Six Physiographic Divisions
- Northern & North-Eastern Mountains: Himalayas + NE hills; central axial range ≈ 2,500 km long, 160–400 km wide; Purvanchal hills run N–S in Nagaland, Manipur, Mizoram.
- Northern Plain: ~3,200 km E–W, 150–300 km wide; alluvium 1,000–2,000 m deep; sub-divided into Bhabar (8–10 km), Tarai (10–20 km), Bhangar (older alluvium), Khadar (newer alluvium); general elevation 50–150 m.
- Peninsular Plateau: 600–900 m irregular triangle; three parts — Deccan Plateau, Central Highlands, Northeastern Plateau. Anaimudi (2,695 m) is the highest peak; Dodabetta (2,637 m) is the second-highest.
- Indian Desert (Marusthali): NW of the Aravalis; rainfall < 150 mm/yr; mushroom rocks, longitudinal dunes, barchans; Mesozoic-era marine origin; Aakal wood-fossil age ≈ 180 mn yrs.
- Coastal Plains: Western coast is submerged (narrow, deep water, natural ports, no deltas, kayals on the Malabar coast); eastern coast is emergent (broader, with major deltas of the Mahanadi, Godavari, Krishna, Kaveri, continental shelf up to 500 km).
- Islands: Andaman & Nicobar (~572 islands; 6°N–14°N, 92°E–94°E; Ten Degree Channel splits Andaman from Nicobar; Barren Island is India's only active volcano; Saddle Peak 738 m). Lakshadweep (8°N–12°N, 71°E–74°E; ~36 coral islands; Minicoy 453 sq. km; Nine Degree Channel divides the group).
Key Terms & Glossary
Physiography?
Outcome of structure, process and stage; the surface form of a region.
Gneiss?
Banded high-grade metamorphic rock; building block of the Peninsular Block.
Gondwana?
Ancient southern supercontinent that once included the Indian plate.
Geo-syncline?
A long, narrow downwarp that gathers thick sediment — basis of the Northern Plain.
Bhabar?
Narrow 8–10 km belt of pebbles & boulders south of the Shiwaliks.
Tarai?
10–20 km marshy belt where Bhabar streams resurface.
Bhangar?
Old alluvium of the Northern Plain, slightly elevated above active floodplains.
Khadar?
New alluvium along present floodplains, renewed every monsoon.
Marusthali?
"Land of the dead" — local name for the Great Indian Desert.
Barchans?
Crescent-shaped sand dunes whose horns point downwind.
Kayals?
Brackish backwaters of the Malabar coast.
Anaimudi?
Highest peak of the Peninsular Plateau (2,695 m), Anaimalai hills, Western Ghats.
Dodabetta?
Second-highest peak (2,637 m) of the Peninsular Plateau, on the Nilgiri hills.
Purvanchal hills?
North-eastern Himalayan hills running north–south through Nagaland, Manipur, Mizoram.
Barren Island?
India's only active volcano, in the Andaman & Nicobar group.
Exercises — Section A · Multiple Choice
Choose the right answer from the four alternatives given below.
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NCERT-Style MCQs
(i) In which of the following physiographic divisions does the Peninsular Block not have a direct presence?
L2 UnderstandAnswer: (D) — The Indo-Ganga-Brahmaputra Plain is built of fresh alluvium on top of the Peninsular basement; the basement is buried, not exposed. The Indian Desert, the main plateau and the Meghalaya/Karbi Anglong outliers all expose Peninsular rocks at the surface.
(ii) The approximate length of the Great Himalayan range from east to west is:
L1 RememberAnswer: (B) — The Great Himalayan range (central axial range) is ~2,500 km long, with width varying between 160–400 km from north to south.
(iii) Which of the following pairs is correctly matched?
L3 ApplyAnswer: (C) — Anaimudi (2,695 m) is on the Anaimalai hills; Dodabetta (2,637 m) is on the Nilgiri hills; Saddle Peak (738 m) is on North Andaman; Mt. Thuiller (642 m) is on Great Nicobar.
(iv) The Ten Degree Channel separates:
L1 RememberAnswer: (B) — The Ten Degree Channel divides the Andaman group (north) from the Nicobar group (south). The Nine Degree Channel separates Amini from Canannore inside Lakshadweep.
(v) The deepest layer of alluvium in the Indo-Ganga-Brahmaputra Plain typically lies in the range:
L1 RememberAnswer: (C) — Alluvium thickness in the Northern Plain ranges from 1,000 to 2,000 m on average, reflecting tens of millions of years of deposition over a former geo-synclinal trough.
(vi) Which one of the following statements about the western coastal plain is FALSE?
L4 AnalyseAnswer: (D) — The Krishna and Godavari deltas are on the eastern coast (emergent). The western coastal rivers do not form deltas; the coast supports natural ports because of submergence.
Exercises — Section B · Short Answer (≈ 30 words)
If the Indian plate has been moving northward for millions of years, why are we still concerned about earthquakes in the Himalayan region today?
Because the convergence of the Indian and Eurasian plates is still continuing. Stress accumulating along faults is released as periodic earthquakes — Bhuj 2001, Kashmir 2005, Sikkim 2011 are recent examples.
Define a relict mountain. Give two Indian examples.
A relict mountain is the highly denuded, low-elevation remnant of an ancient, originally taller range. Indian examples: the Aravali and the Satpura.
What are kayals? Why are they geographically important?
Kayals are brackish backwaters of the Malabar coast (Kerala). They support fishing, inland navigation, tourism (e.g. Punnamada Kayal hosts the Nehru Trophy Vallamkali).
Why are most rivers of the Indian Desert ephemeral?
Annual rainfall is below 150 mm and evaporation is very high. Streams flow only briefly after rare showers and disappear into sand or end in playas with brackish water.
Distinguish Bhangar from Khadar in one sentence each.
Bhangar is the older alluvium of the Northern Plain, slightly elevated above active floodplains. Khadar is the newer alluvium along present floodplains, renewed by every monsoon flood.
Exercises — Section C · Long Answer (≈ 150 words)
Discuss the relationship between India's three geological divisions and its six physiographic divisions. Give one example of each.
India's three geological divisions are the underlying "big building blocks": the rigid Peninsular Block, the young Himalayas with other Peninsular mountains, and the alluvial Indo-Ganga-Brahmaputra trough. The six physiographic divisions express these blocks at the surface, with finer sub-units. The Peninsular Block reaches the surface as the Peninsular Plateau (e.g. Deccan), the Indian Desert (e.g. Marusthali) and parts of the Northeastern Plateau (e.g. Meghalaya). The Himalayan division forms the Northern & North-Eastern Mountains (e.g. Greater Himalayan range, Purvanchal). The geo-synclinal alluvium block forms the Northern Plain (e.g. Khadar of the Ganga). The Coastal Plains (e.g. Konkan, Coromandel) are surface modifications along the edges of the Peninsular Block, and the Islands (e.g. Andaman & Nicobar, Lakshadweep) are tectonic and coral additions in the surrounding seas.
"The northern plains are formed by the alluvial deposits brought by the Indus, Ganga and Brahmaputra." Discuss the structural sub-divisions and characteristic features of these plains.
The Northern Plain stretches ~3,200 km east to west, with widths between 150–300 km, and average alluvium of 1,000–2,000 m. From the Shiwaliks south, four belts can be identified. The Bhabar (8–10 km) is a stony, porous belt where mountain streams disappear into the sub-surface. The Tarai (10–20 km) is a marshy belt where the streams re-emerge into ill-defined channels — luxurious vegetation, varied wildlife. South of these is the Bhangar — the older alluvium, slightly elevated and sometimes containing kankar nodules. The Khadar — the newest alluvium — lies along present floodplains and is replenished by every monsoon flood. Sand bars, meanders, oxbow lakes, braided channels and large deltas (e.g. Sunderbans) are typical mature fluvial features. General elevation 50–150 m supports wheat, rice, sugarcane and jute.
Compare and contrast the western and eastern coastal plains of India.
The western coast is a submerged coastal plain, narrow and squeezed between the Western Ghats and the Arabian Sea, with deep water close to shore. This makes it ideal for natural ports (Kandla, Mazagaon, JLN port Navha Sheva, Marmagao, Mangalore, Cochin). Its rivers — the Narmada and Tapi included — do not form deltas. The Malabar coast in Kerala has distinctive backwaters known as kayals (Punnamada hosts the Nehru Trophy Vallamkali). The eastern coastal plain is broader and is an emergent coast, with a continental shelf extending up to ~500 km — too gentle for natural deep-water ports. Major deltas of the Mahanadi, Godavari, Krishna and Kaveri open along this coast. From north to south the western coast is divided into Kachchh-Kathiawar, Konkan, Goan and Malabar; the east coast is broadly divided into the Northern Circars and the Coromandel coast.
Describe the physiographic features of the Peninsular Plateau and explain why it is considered one of the most stable parts of India.
The Peninsular Plateau is an irregular triangle rising from ~150 m above the river plains to elevations of 600–900 m. Its boundaries include the Delhi ridge (NW), Rajmahal hills (E), Gir range (W) and Cardamom hills (S), with detached extensions in Shillong–Karbi Anglong. Made up of patland plateaus (Hazaribagh, Palamu, Ranchi, Malwa, Coimbatore, Karnataka), it shows tors, block mountains, rift valleys (Narmada, Tapi, Mahanadi), spurs, hummocky hills and quartzite dykes. Three sub-divisions — Deccan Plateau (with Anaimudi 2,695 m, Dodabetta 2,637 m), Central Highlands (Aravali, Satpura, Vindhya, Kaimur), and Northeastern Plateau (Garo, Khasi, Jaintia hills, plus Karbi Anglong) — together cover most of southern India. The plateau is "stable" because it is built of very ancient gneisses and granites that have stood essentially undisturbed since the Cambrian, with only block-faulting and limited coastal submergence.
Map Work — Mark on an Outline of India
MAP EXERCISE — Locating & Labelling Physiographic Features
Bloom: L3 Apply
- The peaks: Anaimudi (2,695 m), Dodabetta (2,637 m), Saddle Peak (738 m), Mount Thuiller (642 m).
- The ranges: Aravali, Vindhya, Satpura, Western Ghats (with names — Sahyadri, Nilgiri, Anaimalai, Cardamom), Eastern Ghats (Javadi, Palconda, Nallamala, Mahendragiri), Purvanchal hills.
- The plateaus: Malwa, Chotanagpur, Meghalaya (Garo, Khasi, Jaintia), Karbi Anglong, Coimbatore, Karnataka, Hazaribagh, Ranchi.
- The plain belts: Bhabar, Tarai, Bhangar, Khadar (use arrows / shading).
- Special points: Aakal wood-fossil park, Marusthali, Punnamada Kayal, Cherrapunji, Barren Island, Ten Degree Channel, Nine Degree Channel, Minicoy Island.
- The deltas: Mahanadi, Godavari, Krishna, Kaveri, Sunderbans (Ganga–Brahmaputra).
- Major faults / rifts: Narmada rift, Tapi rift, Mahanadi rift, Bhima fault, Malda fault.
✅ Tips
Use distinct colour-codes — browns for mountains, yellows for desert/dunes, greens for plains, purples for plateaus, blues for water bodies and channels. Keep all labels in capitals and align them along the feature (so that ranges read along their length, channels along their width). Place state names in faint pencil first to establish a spatial framework, then ink the physiographic features on top.
Project Work
PROJECT — The "Living" Story of Plate Tectonics in My Region
Bloom: L6 Create
Pick the physiographic division in which your school or home lies. Prepare a 4-page illustrated booklet that addresses each of the following sections:
- Tectonic identity: Which geological division does your region belong to? Sketch a simplified plate-tectonic map showing how it formed.
- Signature landforms: Photograph or sketch three local landforms (e.g. a hill, river channel, dune, beach, scarp, gorge). Label rock-type and processes.
- Hazard profile: Identify two natural hazards your region is prone to (earthquake, flood, landslide, drought, cyclone, tsunami) and connect each to its underlying geology / physiography.
- Human use: List three economic activities (e.g. wheat farming, tea growing, salt extraction, port operations, tourism) that your region's physiography directly supports.
- One open question: What is something about your region's geology you still don't understand? Pose it as a research question for the class.
✅ Tips
Use the Geological Survey of India (GSI) website and your state's natural-resource atlas as starting sources. Wherever possible, include a hand-drawn cross-section. End the booklet with a one-page reflection: "What did this project teach me about how geology shapes daily life?"
Competency-Based Drill — Integrative Case Study
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Case-Based Questions
Case Study: A team of geographers is asked to advise on rail-line alignment from Jaisalmer (Rajasthan) to Itanagar (Arunachal Pradesh). The route will cross the Indian Desert, the Aravali range, the Bhangar–Khadar belts of the Indo-Gangetic plain, the Bhabar–Tarai foothills of the Himalayas and finally enter the Eastern Himalayas. The team must explain to the planners how the geology and physiography of each segment shapes the engineering, hazards and ecology of the line.
Q1. Of the segments listed below, which would the team flag as needing the strongest seismic-design standards, and why?
L4 AnalyseAnswer: (C) — The Himalayan front, including the Bhabar–Tarai foothills, sits on the live Indian–Eurasian plate boundary. Earthquakes here can be very large and shallow; the rail line will need stringent seismic-design codes, deep-pile foundations, slope-stabilisation and slope-drainage works.
Q2. Which segment is most likely to need extensive bridges and embankments rather than tunnels and rock cuttings?
L3 ApplyAnswer: (B) — Khadar belts are wide, low-lying, recently deposited alluvium with shifting river channels and seasonal flooding. Long bridge-and-embankment combinations are essential; rock excavation is not relevant on soft alluvium.
Q3. In four sentences, justify why the same alignment that demands tunnels and avalanche-galleries in the Eastern Himalayas demands wind-fences and dune-arrest plantations in the Marusthali.
L5 EvaluateModel Answer: Each physiographic division throws up a different dominant hazard. In the Eastern Himalayas, steep gradients, intense rainfall and active tectonics generate landslides, slope failure and seasonal snow-avalanches — engineering responses are tunnels, retaining walls and avalanche galleries. In the Marusthali, the dominant problems are barchans migrating across tracks, wind-blown sand, and extreme aridity — engineering responses are wind-fences, dune-arrest plantations and stabilisation of sand by vegetation. The same rail line must therefore use very different toolkits at very different locations, because each division's hazards reflect its own geology, climate and stage of landform development.
HOT Q. Design a "physiographic risk-card" template that any future infrastructure project in India should fill before planning. List the five categories you would put on the card and one example question under each.
L6 CreateHint: A workable card might use these five categories — (1) Geological setting: which of India's three geological divisions does the site lie in? (2) Physiographic context: which of the six physiographic divisions and which sub-belt? (3) Hazard profile: dominant earth-process risks (earthquake, landslide, flood, dune migration, tsunami)? (4) Climatic forcing: rainfall, temperature, wind regime and seasonality? (5) Ecological & social context: protected areas, indigenous communities and livelihoods that must be safeguarded?
⚖️ Assertion–Reason Questions — Chapter Recap
Options:
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is NOT the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is NOT the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
Assertion (A): The Meghalaya plateau today stands detached from the main Peninsular Block.
Reason (R): A huge fault opened between the Rajmahal hills and the Meghalaya plateau due to the north-eastward push of the Indian plate during Himalayan uplift, and this depression was later filled by river deposition.
Answer: (A) — Both A and R are true, and R correctly explains A: the faulting and subsequent sediment fill is exactly why Meghalaya and Karbi Anglong now stand as outliers of the Peninsular Block.
Assertion (A): Cherrapunji has a bare rocky surface devoid of permanent vegetation.
Reason (R): Cherrapunji lies in a rain-shadow region with very low annual rainfall.
Answer: (C) — A is true. R is false: Cherrapunji actually receives extreme rainfall from the south-west monsoon. The bareness arises from heavy soil erosion and weathering of the highly eroded Meghalaya plateau surface, not from low rainfall.
Assertion (A): The Aakal wood-fossils park near Jaisalmer indicates that the Indian Desert was once under the sea.
Reason (R): The fossil wood at Aakal is approximately 180 million years old and is corroborated by marine deposits around Brahmsar.
Answer: (A) — Both A and R are true, and R correctly explains A: ~180-million-year-old fossil wood plus marine deposits is direct Mesozoic-era evidence of a former marine environment in the present-day desert.
End of Chapter 2 — Structure & Physiography
Revise the summary, then test yourself with the MCQs, short-answer drills and case studies above before moving on to the next chapter on India's drainage systems.
Revise the summary, then test yourself with the MCQs, short-answer drills and case studies above before moving on to the next chapter on India's drainage systems.
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