UPSC GS Paper I Ancient History Indus Valley Civilisation Urban Planning Trade Decline

Must‑Know (20–25 detailed bullets)

• Harappa discovered in 1921 by Daya Ram Sahni under Archaeological Survey of India (ASI); marked the beginning of systematic excavation of Indus Valley Civilisation (IVC).
• Mohenjo‑daro excavated in 1922 by R. D. Banerji; located on the banks of the Indus River in Sindh, now in Pakistan.
• IVC flourished between 2600 BCE and 1900 BCE; mature phase began after 2600 BCE following early Harappan cultures (7000–2600 BCE).
• Urban planning featured grid‑iron street layout; streets intersected at right angles, dividing cities into rectangular blocks (e.g., Mohenjo‑daro’s Citadel and Lower Town).
• Standardized burnt brick sizes used across IVC sites: 7 × 14 × 28 cm, indicating centralized authority and advanced construction techniques.
• Citadel structures built on raised mud‑brick platforms; housed public buildings like Great Bath (Mohenjo‑daro) and Granary (Harappa).
• Great Bath at Mohenjo‑daro: 12 m × 7 m × 2.4 m, waterproofed with bitumen, possibly used for ritual bathing.
• Drainage system was covered, with manholes for cleaning; houses connected to street drains, reflecting advanced sanitation.
• Houses were typically two‑storeyed with private wells and bathrooms; waste water drained into covered street drains.
• No conclusive evidence of temples or palaces; absence of monumental royal architecture suggests possible non‑hierarchical or collective governance.
• Dockyard at Lothal (Gujarat) connected to Sabarmati River; facilitated maritime trade with Mesopotamia.
• Lothal’s dockyard dates to c. 2400 BCE; designed to protect ships from tidal surges using inlet and outlet channels.
• IVC engaged in trade with Mesopotamia; Harappan seals and weights found at Ur, Babylon, and Kish; Mesopotamian texts refer to "Meluhha" (probable IVC).
• Trade goods included lapis lazuli (from Afghanistan), carnelian (from Gujarat), copper (from Khetri, Rajasthan), and ivory.
• Weights followed a binary system for smaller units and decimal for larger; standardized cubical stone weights found at multiple sites.
• Seals made of steatite, typically 2 × 2 inches, with animal motifs (unicorn bull most common) and undeciphered script; used for trade identification.
• Script is non‑phonetic, pictographic, and written in boustrophedon style (alternating direction); remains undeciphered due to lack of bilingual inscriptions.
• Agricultural surplus supported urbanization; crops included wheat, barley, sesame, mustard, and cotton (first cultivated in IVC).
• Evidence of irrigation from canals at Shortughai (Afghanistan) and reservoirs at Dholavira.
• Dholavira, in Khadir Bet (Gujarat), had a sophisticated water management system with 16 reservoirs and stepwell‑like structures.
• Animal remains show domestication of cattle, buffalo, sheep, goat; elephants and camels present but not clearly domesticated.
• No clear evidence of warfare: limited weapons, no fortifications for war, absence of large‑scale battle depictions.
• Decline began c. 1900 BCE; attributed to multiple factors including climate change, river shifts, and ecological degradation.
• Ghaggar‑Hakra river system, identified with Sarasvati River in later texts, dried up due to tectonic shifts and reduced monsoon.
• Aryan migration theory (outdated) once linked decline to Indo‑Aryan invasion; now rejected due to lack of archaeological evidence of violent destruction.

Difficulty Level

Intermediate – requires integration of archaeological findings, chronology, and multidisciplinary evidence (geography, climate, linguistics); indirect questions common.

Common UPSC Traps (3–5 factual traps)

Trap: IVC had a centralized monarchy like Egyptian or Mesopotamian civilizations – Fact: No evidence of kingship or palaces; governance likely oligarchic or collective, inferred from uniformity in town planning and absence of royal burials.
Trap: The script of IVC is deciphered and linked to Sanskrit – Fact: IVC script remains undeciphered; no proven link to Dravidian or Indo‑Aryan languages; no bilingual inscriptions found.
Trap: Decline of IVC was caused solely by Aryan invasion – Fact: No archaeological evidence of large‑scale invasion or destruction; decline attributed to environmental factors like river drying and climate change.
Trap: Great Bath was a public swimming pool – Fact: Great Bath was likely used for ritual purification, not recreation, based on its location in Citadel and associated rooms.

Practice MCQs (5–7 questions)

Question: Which of the following sites of the Indus Valley Civilisation provides evidence of a dockyard?
A) Kalibangan
B) Banawali
C) Lothal
D) Ropar
Answer: C
Explanation: Lothal had a tidal dockyard connected to the Sabarmati River, used for maritime trade with West Asia.
Why others fail: Kalibangan had ploughed fields and fire altars, but no dockyard; others lacked port infrastructure.

Question: The Great Bath, a significant structure of the Indus Valley Civilisation, has been found at:
A) Harappa
B) Mohenjo‑daro
C) Dholavira
D) Rakhigarhi
Answer: B
Explanation: The Great Bath is located in the Citadel area of Mohenjo‑daro and is one of the earliest public water tanks.
Why others fail: Dholavira had reservoirs but not a structure identical to the Great Bath; Harappa had a granary, not a bath.

Question: Which of the following crops was first cultivated in the Indian subcontinent by the Indus Valley people?
A) Rice
B) Cotton
C) Sugarcane
D) Wheat
Answer: B
Explanation: Cotton cultivation originated in IVC; the term "cotton" derives from "khata" (Sanskrit), and IVC exported cotton to Mesopotamia.
Why others fail: Wheat and barley were cultivated but not first domesticated in IVC; rice cultivation was limited and not widespread.

Question: The decline of the Indus Valley Civilisation is best explained by:
A) Invasion by Indo‑Aryans
B) Sudden earthquake destroying major cities
C) Shift in river courses and climate change
D) Widespread epidemic
Answer: C
Explanation: Geological and sedimentary evidence shows Ghaggar‑Hakra river system dried up due to tectonic activity and weakening monsoon.
Why others fail: Aryan invasion theory lacks archaeological support; no evidence of epidemic or single catastrophic earthquake.

Question: Which of the following is a feature of urban planning in the Indus Valley Civilisation?
A) Use of dressed stone for temples
B) Grid‑pattern streets
C) Construction of ziggurats
D) Use of arches and domes
Answer: B
Explanation: Cities like Mohenjo‑daro and Harappa followed a grid‑iron pattern with streets intersecting at right angles.
Why others fail: Ziggurats are Mesopotamian; arches and domes appeared much later; no temples confirmed in IVC.

Last‑Minute Revision (20–25 one‑liners)

• Harappa discovered in 1921; Mohenjo‑daro in 1922.
• Mature IVC: 2600–1900 BCE.
• ⚠️ IVC script remains undeciphered – no bilingual inscription found.
• Standard brick ratio: 1:2:4 (thickness:length:width).
• Great Bath – Mohenjo‑daro – ritual use.
• Lothal – dockyard – tidal, connected to Gulf of Cambay.
• Dholavira – 16 reservoirs – water management.
• Kalibangan – ploughed field – earliest evidence of furrowed agriculture.
• Rakhigarhi – largest IVC site by area (over 80 hectares).
• Ganweriwala – major site in Pakistan’s Punjab – unexcavated.
• ⚠️ No evidence of iron, horse, or coinage in IVC.
• Horse remains disputed – doubtful presence.
• Unicorn motif most common on seals.
• Steatite – primary material for seals.
• Trade with Mesopotamia – Harappan seals at Ur.
• Meluhha in Mesopotamian texts – likely IVC.
• ⚠️ No temples or palaces identified.
• Drainage – covered, with manholes.
• Houses had private bathrooms and wells.
• Binary weight system – smaller units.
• Cotton – first cultivated in IVC – exported to Mesopotamia.
• ⚠️ Decline: c. 1900 BCE – river drying, not Aryan invasion.
• Ghaggar‑Hakra – identified with Sarasvati River.
• ⚠️ No conclusive evidence of warfare.
• Shortughai – source of lapis lazuli – in Afghanistan.
• verify from standard source: exact number of IVC sites.