NCERT Solutions for Class 9th Social Science Chapter 4 The chapter's recap points, expanded with their evidence — Before we move on …

What this recap means, expanded. Two claims are packed into one line — how long the period is, and what we can know about it. Fig. 4.3 supplies the numbers for both.

The three kinds of evidence named, and what each one proves:

• Tools — what people could do. Because they were made, used, discarded and buried, the sequence from handaxe to microblade to polished Neolithic tool can be read layer by layer. Tools also travel: Homo erectus handaxes found across Asia and Europe are how we date the exit from Africa to 2–0.5 million years ago.
• Fossils — what people were. Remains buried under layers of earth 'slowly turn into stone over thousands or millions of years'; Fig. 4.6's four skulls are why we can name Homo habilis, erectus, neanderthalensis and sapiens at all.
• Cave art — what people thought about. Bhimbetka in Madhya Pradesh, a World Heritage Site, has hundreds of painted rock shelters with Mesolithic and earlier occupation — the nearest we come to entering their minds.

The claim, with the evidence for each half.

Evolved in Africa. The chapter states it as agreed knowledge: 'It is generally agreed that our earliest ancestors evolved and lived in Africa.' The fossil evidence sits in specific African places — Homo habilis in the Olduvai Gorge in Tanzania and Kenya, Homo erectus in the Eastern African Rift Valley, and Homo sapiens evolving in Africa about 300,000 years ago.

Migrated gradually. Two waves, both dated by what they left behind:

Where they went, and where they stopped. Africa, Asia and Europe together form what the chapter calls the Old World — 'the geographical area of the oldest human settlements of the earliest palaeolithic period'. Australia and the Americas were reached only much later, and only by Homo sapiens. Fig. 4.4 maps the potential routes of early Homo dispersal, running from the Olduvai Gorge north through the Nile Valley and the Levant, then east across Asia — with Hathnora in India and Denisova Cave in Siberia marked along the way.

The Palaeolithic in India, with its dates and its evidence. The oldest human settlement in the subcontinent goes back about 2 million years. Two sites anchor that claim:

What each tool was for — and the chapter is specific, because archaeologists have tested it by making and using replicas: to chop animal meat, dig out tubers, scrape animal skin, and cleave animal bones to extract protein-rich marrow. That last one matters: it says these people were getting at food inside bones that other animals could not open.

The toolkit did not stand still. The chapter traces three stages within the Palaeolithic:

1. Large cutting tools — handaxes and cleavers (Fig. 4.9, captioned 'dating to about 1–5 million years in India').
2. Smaller tools — scrapers, borers and points (Fig. 4.10, Middle Palaeolithic), which 'indicate improved efficiency in hunting by developing projectiles which were tipped with sharp points'. A pointed tip on a thrown weapon is a real advance: you can now kill at a distance.
3. Blades and microblades struck from glassy rock, 'very sharp when freshly made', plus the bow and arrow, hunting of small game, and the first beads of stone, bone and shell.

And where they lived: caves, rock shelters and open camps — no permanent buildings, because a hunting and gathering economy has to move with its food.

Start with the cause, because the Mesolithic begins with the climate. 'Around 12000 years ago, Earth's climate became warmer, leading to significant changes in the environment.' Follow the chain the chapter sets out:

Why the tools got smaller, not bigger. A handaxe is made for a large carcass. When the food is small game, fish and wild grain, what you need is many small sharp edges — so people made microliths. The chapter records the decisive technique: 'the microblades were fixed in a handle for ease of use'. That is composite tool-making — several tiny stone pieces set into wood or bone to make one sickle, knife or arrow. It uses far less stone, is easily repaired one piece at a time, and can be shaped for any job.

What the microlithic kit let them do. 'A variety of microlithic tools enabled the people to gather aquatic food—both marine and freshwater—and fishing was the mainstay of their subsistence economy.' This is the real shift: from chasing large animals across country to working a rich patch of water and shore.

Where they lived. Near water — which is exactly where the fish and the wild grain were. The chapter also records that 'new habitats such as caves and rock shelters were frequently occupied', so the settlements were still not permanent villages: they were places returned to again and again.

The definition first. 'The hallmark of this revolution was the domestication of select animals and plants, bringing them under human control, and the development of new breeds through cultivation and husbandry.' Two verbs matter — control and breed. Domestication is not just keeping animals; it is changing them over generations.

The evidence, at one site, in detail. Mehrgarh on the Bolan river (in present-day Pakistan) is the subcontinent's oldest Neolithic site and its earliest agricultural village, dating back to about 7000 BCE (Fig. 4.16). Everything the recap line claims is present there at once:

Pottery. Neolithic farmers 'developed a variety of earthenware pottery in various shapes and sizes'. Pottery is a farming technology: grain has to be stored dry against damp and pests, and cooked grain needs a vessel that will sit on a fire. Fig. 4.14 shows pottery in every one of its six regions.

Weaving. The recap line names it, though the running text of this chapter does not describe it separately — the closest it comes is the domestication of sheep at Mehrgarh (wool) and, much later, silk in China from 4000–3000 BCE. Say so if you are asked for evidence: this is a recap claim you cannot support from this chapter's own text.

The name says the definition. Fig. 4.7 defines the Chalcolithic as 'use of copper along with stone tools; early metallurgy (extraction and shaping of metal objects or artefacts)'. Note the phrase along with — stone did not disappear. This is a period of two materials, not a replacement.

Why extraction is the hard part. Copper is not lying about as metal; it has to be got out of its ore, which means fire hot enough and controlled enough to smelt rock. The chapter marks the moment carefully: some settlements 'mastered the extraction of copper from its ores around 4000 BCE, and became the earliest Chalcolithic sites in the subcontinent'. Mehrgarh's people 'were also the first to make copper objects, thus entering the metal age'.

What copper did to farming — the sentence that links metal to civilisation. 'Introduction of copper tools in the fertile alluvial plains of the Indus and the Ghaggar-Sarasvatī basins enhanced productivity, leading to increased prosperity in these communities.' Sharper, re-sharpenable, re-castable tools mean more land worked, so more surplus, so more people freed for crafts. And the chapter records exactly that consequence: 'this is also a period of large-scale production of pottery showing diverse regional styles', with copper work, shell work and semi-precious stone beads all developing.

The same step happened elsewhere, on its own timetable:

Bronze is an alloy, and that is the technical heart of the age. Fig. 4.7 defines the Bronze Age as 'development of bronze metallurgy (mixing copper and tin to make bronze); expansion of trade, towns, and early civilisations'. Making bronze needs two metals that rarely occur together — so from the start, bronze metallurgy requires long-distance trade. The technology and the trade network grow together.

The five characteristics, each with its evidence from this chapter:

Four civilisations, four river systems, and — the chapter insists — four independent inventions.

What 'independently' means, and how the chapter shows it. Not that they never met — Mesopotamia and the Harappans traded, and the chapter says the proximity of the two 'facilitated strong contacts'. It means they invented their institutions separately. Three pieces of evidence support that:

1. Different dates. The Bronze Age begins at 3500 BCE in Mesopotamia (Fig. 4.22), 3300 BCE in India (Fig. 4.18), 3100 BCE in Egypt (Fig. 4.28) and 2000 BCE in China (Fig. 4.35). If one had copied another, the dates would cluster.
2. Different solutions to the same problems. Four unrelated scripts — wedges in clay, pictures on stone seals, hieroglyphs on papyrus, symbols on bone. Four water systems — Sumerian canals, Egyptian ditches and reservoirs, Harappan gabarbands and rock-cut tanks, and Chinese river-valley farming.
3. No contact where there was distance. Egypt and China 'have little tangible evidence of their direct contact with the Sindhu–Sarasvatī civilisation'. Yet all four ended up with cities, writing, administration and hierarchy anyway.