Q1.
Notice how many of the mahājanapadas are concentrated in the Ganga plains. There are several possible reasons for this, including the growth of agriculture in the fertile Ganga plains, the availability of iron ore in the mountains and hills (see below about iron), and the formation of new trade networks.
Answer
First, count them on the map (Fig. 4.3). Of the sixteen mahājanapadas, most sit in or along the Ganga plains — Kuru, Pāñchāla, Śhūrasena, Kosala, Kāśhi, Vatsa, Malla, Vṛijji, Magadha and Anga. Only Kamboja and Gandhāra lie in the northwest, Matsya and Avanti and Chedi in the west and centre, and Aśhmaka far south near the Godavari.
Now the three reasons the book offers, and how each one works:
| Reason | How it helps a state grow there |
|---|---|
| Fertile Ganga plains | Flat land, thick alluvial soil and plenty of water give a surplus of grain. A surplus feeds people who are not farmers — soldiers, craftspeople, traders, priests, officials — and that is exactly what a city is made of. |
| Iron ore in the mountains and hills | Iron ore was available in the hills near the plains (south Bihar and Jharkhand, the Vindhya edges). Iron axes helped clear forest, iron ploughshares turned heavier soil, and iron weapons defended what was gained. |
| New trade networks | The Ganga and its tributaries are natural highways; the Uttarapatha ran along the plains. Goods, coins and ideas moved easily, so settlements on the route grew rich and turned into cities. |
Why they work together: no single factor is enough. Fertile soil without iron tools gives small clearings; iron without trade gives no wealth; trade without a food surplus gives no towns to trade between. In the Ganga plains all three came together — which is why the largest and most powerful states, Magadha and Kosala, grew exactly there.
Try this: add a fourth reason of your own. Rivers also gave cheap transport and drinking water, and the plains had good timber and clay for building. Defend your reason with evidence, the way a historian would.