Q.Which of the following were necessary conditions and which the causes, of early urbanisation, and which would you say were the outcome of the growth of cities:

Let’s sort these out by logic, not by rote. Early cities could not appear unless farmers produced more food than they needed for themselves. That surplus freed some people to become artisans, scribes, traders, and officials — so (a) highly productive agriculture is the necessary condition that made urbanisation possible at all. Without it, no city could feed itself.

Now, what actually pushed or pulled people into cities? (b) Water transport made it easy to move surplus grain and raw materials, so it was a cause — it allowed trade to grow and cities to specialise. (c) The lack of metal and stone in the alluvial plains forced communities to trade for these materials, and that trade itself became a cause of urban growth. (d) The division of labour — people specialising as potters, weavers, metalworkers — was both a cause and an outcome: it arose because surplus existed, and it in turn made cities more productive and complex.

Now the outcomes. (e) The use of seals came after trade and administration had grown — seals were a tool for marking goods and documents, so they are an outcome of urbanisation. (f) The military power of kings that made labour compulsory is trickier. Compulsory labour (corvée) was used to build city walls, temples, and irrigation works, so it was a cause of urban infrastructure — but the very need for such large-scale organisation only arose once cities had grown. So it is best seen as a cause that intensified with urban growth, not a necessary precondition.

Let’s begin with the big picture. Early cities did not appear because someone decided to build them. They emerged when a society crossed a threshold — when enough food could be produced by a few people so that others could stop farming and do something else. That is the heart of the Surplus Agriculture Theory. Before you can have a city, you must have a countryside that feeds it. So the first question to ask is not “what did cities need?” but “what made cities possible at all?”

1. Highly productive agriculture — this is the necessary condition, the foundation stone. If every family had to spend all its time growing its own food, nobody could become a potter, a scribe, a merchant, or a priest. A surplus — food grown beyond what the farmer’s own household needs — frees people to specialise. In the Indus region, the fertile alluvial soil and the monsoon rhythms allowed exactly this. Without that surplus, urbanisation is simply impossible. So this is not a “cause” in the sense of a trigger; it is the precondition that makes everything else thinkable.
2. Water transport — also a necessary condition, though of a different kind. Cities are dense concentrations of people who cannot feed themselves from their own fields. They must import grain, and they must export what they make. In the ancient world, moving bulk goods by cart or on foot was brutally expensive; rivers and coasts were the highways. The Indus cities sat on or near the Indus and its tributaries, and they traded with Mesopotamia by sea. Water transport did not cause cities, but it made them viable — without it, a city would starve or choke on its own goods. So: necessary condition, not a cause.
3. The lack of metal and stone — this is an outcome, and a fascinating one. The Indus region had no local sources of copper, tin, or good stone. So the cities had to reach out — to Rajasthan, to Baluchistan, to the coast — to get these materials. That outward pull created trade networks, and trade networks created the need for standardised weights, for seals, for record-keeping. In other words, the very scarcity of raw materials helped shape what the cities became. It did not cause urbanisation; urbanisation caused the response to that scarcity.
4. The division of labour — this is both a cause and an outcome, and it is the most interesting item on the list. Once agriculture produced a surplus, some people could stop farming. That is the division of labour as a cause: it is the mechanism by which surplus becomes a city. But once cities existed, the division of labour deepened — you now have full-time bronze workers, full-time seal carvers, full-time bead makers. So the division of labour is the bridge between the necessary condition and the urban result. It is not a separate cause; it is the process itself.
5. The use of seals — clearly an outcome. Seals are a city phenomenon. They are used to mark goods, to authenticate ownership, to stamp clay tags on bundles of merchandise. A village farmer does not need a seal; a merchant shipping goods across hundreds of kilometres does. The Indus seals — with their animal motifs and undeciphered script — are among the most iconic artefacts of the cities. They are a symptom of the complexity that cities created, not a cause of that complexity.
6. The military power of kings that made labour compulsory — this is the one that does not fit. The Indus cities show no evidence of palaces, no grand royal tombs, no monuments to conquerors. The layout of Mohenjo-daro and Harappa — the grid of streets, the great bath, the granaries — suggests coordination, but not coercion by a single warlord. Compulsory labour under a king is a model that fits some later states, but not the early Indus urbanisation. So this is neither a necessary condition nor a cause; it is a theory that the evidence does not support.
   Note

   The distinction between “necessary condition” and “cause” matters. A necessary condition is something without which the event cannot happen — but it does not by itself make the event happen. A cause is something that actively pushes the event into being. Agriculture is necessary but not sufficient; trade networks and social organisation are what actually triggered the urban leap.

   Important

   The Indus cities were not built by kings with armies. Their uniformity — the same bricks, the same weights, the same seals across a vast region — points to a society that cooperated through shared norms and trade, not through forced labour. That is why (f) is rejected.

   ✓Final answer

   In short: highly productive agriculture and water transport were the necessary conditions; the division of labour was the active cause (and later an outcome); the use of seals and the lack of metal and stone were outcomes of urban growth; and the military power of kings was neither — the Indus evidence shows no such coercive force.