Evolution of Humans and Society – Prehistoric Period — Class 9 Social Science (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 9 Social Science, History — Chapter 1. How humans evolved, the prehistoric stone ages, and early society in Tamil Nadu.

1. About this lesson

This chapter explains human evolution, the prehistoric period before writing was invented, the Stone Ages (Palaeolithic, Mesolithic, Neolithic), and the Iron Age / Megalithic period in Tamil Nadu. You will learn how scientists use fossils, stone tools, and burial sites to reconstruct the story of our ancestors.

2. Understanding prehistory and history

• Prehistory: The period before the introduction of writing. Prehistoric people developed language, made paintings and artifacts, but had no written records.
• History: Begins with the invention of writing. The beginning of history writing is traced to the ancient Greeks. Herodotus is called the Father of History.
• Prehistoric societies are not treated as literate — they left no written documents. The prehistoric period is also called ancient.
• The hallmark of human civilisation is the introduction of the writing system.

3. How we study human origins — key sciences

• The Earth formed approximately 4.54 billion years ago.
• Earth's upper layers contain geological, archaeological, and biological records. Fossil bones of human ancestors are embedded in these layers.
• Eons are long periods covering millions of years.
• Primitive multicellular life first appeared in the Proterozoic era. Dinosaurs lived in the Mesozoic era.

4. The story of human evolution

4.1 Key terms

• Hominid: All species of modern and extinct great apes, including humans.
• Hominin: The ancestors of modern humans; their origins have been traced to Africa.
• Homo habilis: The earliest human ancestor to make tools in Africa.
• Homo erectus: Walked upright.
• Homo sapiens: Modern humans — the direct ancestor of modern man.
• Humans are the only living species of the Hominin tribe.

4.2 The great apes and genetics

• Among the great apes (Gorilla, Chimpanzee, Orang-utan, Great Apes), the Chimpanzee is genetically closest to humans (NOT the Orang-utan).

4.3 Important fossils and discoveries

• Cro-Magnons belonged to Europe and lived during the Upper Palaeolithic period.
• In Tamil Nadu, the stone tools of the Lower Palaeolithic culture are found at Athirampakkam near Chennai.
• Sir Robert Bruce Foote, a geologist from England, first discovered Palaeolithic tools at Pallavaram near Chennai.
• The Fertile Crescent refers to the area covering Egypt, Israel-Palestine, and Iraq — a region important in early agriculture.
• The Great Rift Valley in Africa is rich in Hominin fossils.

5. The Stone Ages (Lithic periods)

5.1 Palaeolithic (Old Stone Age) — Lower, Middle, Upper

• Lower Palaeolithic: The earliest stone tool culture. Tools: hand axes and cleavers.
  • Hand axe tools are also called Acheulian (named after St. Acheul, France).
  • Bifaces are tools flaked on both sides (bi = two, face = side).
  • Acheulian tools are found at Isampur in Karnataka and Bhimbetka in Madhya Pradesh.
  • In Tamil Nadu: Athirampakkam near Chennai.
• Middle Palaeolithic: Smaller, finer tools.
• Upper Palaeolithic: Cro-Magnons lived in this period; blade tools, bone tools, and art appear.

5.2 Core and flake technology

• Core: The main block of stone from which small chips are flaked using a hammerstone.
• Flake: A small chip removed from a large stone block (core).
• Burin: A stone-made chisel with a sharp cutting edge.
• Tool-making tradition continued from ~250,000 years ago to ~60,000 years ago in India.

5.3 Mesolithic (Middle Stone Age)

• Placed between the Palaeolithic and Neolithic.
• Mesolithic sites are found near rivers and tanks.
• Small stone tools called microliths appear. Lunates are crescent-shaped microliths.
• IMPORTANT: Irrigation management did NOT develop in the Mesolithic — it developed later (Neolithic). Assertion-type questions test this common mistake.

5.4 Neolithic (New Stone Age)

• The period called Neolithic marks the beginning of agriculture and animal domestication (NOT Mesolithic).
• Neolithic people used polished stone axes called Celts.
• Evidence of Neolithic village is found at Payyampalli in Vellore district (not Chennai).
• The cultural period that succeeded the Neolithic is the Bronze Age (not Iron Age directly).
• Cultivation of crops and domestication of animals belong to the Neolithic period, NOT the Mesolithic.

6. The Iron Age / Megalithic Period in Tamil Nadu

• The Iron Age is also known as the Megalithic period because people created burials with large stones for the dead.
• Burials contain skeletons or bones placed with grave goods: iron objects, carnelian beads, bronze objects.
• Some burials have only grave goods and no human bones — these are called memorial burials.
• Evidence of rice cultivation in the deltaic region is found at Adichanallur (Thoothukudi district) and Porunthal (near Palani).
• People practiced agriculture, domesticated cattle and sheep, cultivated millets and rice, and developed irrigation management.
• Weapons found: swords, daggers, axes, chisels, lamps, tripod stands. Bronze bowls, vessels with animal/bird finials, bronze mirrors, and bells.

7. Darwin and the scientific understanding of human origins

• The concept of "survival of the fittest" contributed to the scientific understanding of human origins.
• The book "On the Origin of Species" was published by Charles Darwin (NOT Herbert Spencer).
• Darwin's theory of biological evolution connects with the process of natural selection.
• The age of speculation made humans conscious and knowledgeable — they became curious, began thinking about nature and organisms, and asked questions. Initially they worshipped nature as God; later they developed their own understanding, some of which was not scientific.

8. Museums — preserving the past

9. Worked examples

Example 1. Which great ape is genetically closest to humans? Chimpanzee. (NOT Orang-utan — common mistake.)

Example 2. Which period marks the beginning of agriculture? Neolithic. (NOT Mesolithic — the Mesolithic is the Middle Stone Age between Paleolithic and Neolithic.)

Example 3. Who first discovered Palaeolithic tools in India? Sir Robert Bruce Foote, at Pallavaram near Chennai.

Example 4. What is the Fertile Crescent? The area covering Egypt, Israel-Palestine and Iraq.

10. Book-back questions (Samacheer Kalvi)

I. Choose the correct answer

1. ______ is genetically closest to humans — (a) Gorilla / (b) Chimpanzee / (c) Orang-utan / (d) Great Apes. Ans: (b) Chimpanzee.

2. The period called ______ marks the beginning of agriculture and animal domestication — (a) Paleolithic / (b) Mesolithic / (c) Neolithic / (d) Megalithic. Ans: (c) Neolithic.

3. Direct ancestor of modern man was ______ — (a) Homo habilis / (b) Homo erectus / (c) Homo sapiens / (d) Neanderthal man. Ans: (c) Homo sapiens.

4. ______ refers to the area covering Egypt, Israel-Palestine and Iraq — (a) Great Rift Valley / (b) Fertile Crescent / (c) Solo river / (d) Neander Valley. Ans: (b) Fertile Crescent.

5. Sir Robert Bruce Foote first discovered ______ tools at Pallavaram near Chennai — (a) Stone Age / (b) Palaeolithic / (c) Mesolithic / (d) Neolithic. Ans: (b) Palaeolithic.

6. (i) The period before writing is called pre-history. (ii) The pre-historic people developed language, made paintings. (iii) Pre-historic societies are treated as literate. (iv) The pre-historic period is called ancient. — (a) (i) is correct / (b) (i) and (ii) are correct / (c) (i) and (iv) are correct / (d) (ii) and (iii) are correct. Ans: (c). (iii) is wrong — prehistoric societies are NOT literate.)

7. (i) Neolithic people used polished stone axes called Celts. (ii) Evidence at Payyampalli in Chennai district. (iii) The period after Neolithic is the Bronze Age. (iv) Domestication of animals is Mesolithic. — (a) (i) is correct / (b) (ii) is correct / (c) (ii) and (iii) are correct / (d) (iv) is correct. Ans: (a). (ii-wrong: Payyampalli is in Vellore not Chennai; iv-wrong: domestication is Neolithic not Mesolithic.)

8. Assertion (A): Many Mesolithic sites are found near rivers and tanks. Reason (R): Irrigation management developed during the Mesolithic. — (a) A & R correct, R explains A / (b) A & R correct, R doesn't explain A / (c) A correct, R incorrect / (d) A and R both are incorrect. Ans: (d). (A is actually correct — sites ARE near rivers — but the Samacheer answer key states both incorrect; check your textbook edition.)

II. Fill in the blanks

9. Hand axes and cleavers are important tool types of Lower Palaeolithic culture.
10. The methods and techniques in stone tool production are called Lithic technology.
11. Mesolithic period is known as the Middle Stone Age, placed between Palaeolithic and Neolithic.

III. Find out the correct statement

12. (a) 'Survival of the fittest' contributed to scientific understanding of human origins → Correct. (b) "On the Origin of Species" was published by Herbert Spencer → Wrong. Published by Charles Darwin. (c) Darwin's theory connects with natural selection → Correct. (d) Geology is the study of lithic technology → Wrong. Geology studies the Earth; lithic technology studies stone tools.

13. (a) Among great apes, Orang-utan is genetically closest to humans → Wrong. Chimpanzee is closest. (b) Ancestors of humans were Hominins, traced to Africa → Correct. (c) Flake is a small chip with flaking on both sides → Wrong. A flake is a chip removed from a core; biface has flaking on both sides. (d) Acheulian is the main block from which chips are flaked → Wrong. Core is the main block; Acheulian is a hand-axe tool tradition.

IV. Match the following

V. Answer briefly

14. Discuss how the age of speculation made humans conscious and knowledgeable.

    • Humans are the only species concerned with understanding the world.
    • They became curious and began thinking about nature, organisms, and the world around them (e.g., at first they worshipped nature as God).
    • Later they developed their own understanding — some not scientific. Thus the age of speculation made humans conscious and knowledgeable.

15. Write a note on the impact of pastoralism on prehistoric people in Tamil Nadu.

    • People practised agriculture, domesticated cattle and sheep; some groups still hunted and gathered.
    • Millets and rice were cultivated. Irrigation management developed.
    • In the deltaic region, evidence of rice is seen at Megalithic sites like Adichanallur (Thoothukudi) and Porunthal (near Palani).

16. List the features of Megalithic burial types.

    • Burials with large stones for the dead. Skeletons/bones placed with grave goods (iron objects, carnelian beads, bronze objects).
    • Some burials have only grave goods, no human bones — called memorial burials.

17. Examine the tool-making technical skills of Lower Palaeolithic people.

    • Flaked large stone blocks, designed hand axes and cleavers for subsistence needs.
    • Hand axe tools called Acheulian. Bifaces flaked on both sides.
    • Tradition continued from ~250,000 to ~60,000 years ago in India.

VI. Answer all questions under each caption

18. Hominid and Hominins

    • (a) Hominid = all species of modern and extinct great apes, including humans.
    • (b) Homo habilis was the earliest human ancestor to make tools in Africa.
    • (c) Modern humans are known as Homo sapiens.
    • (d) Humans are the only living species of this tribe.

19. Earliest Lithic Assemblages of Human Ancestors

    • (a) Acheulian tools found at Isampur (Karnataka) and Bhimbetka (Madhya Pradesh).
    • (b) Burin = a stone-made chisel with a sharp cutting edge.
    • (c) Biface = tools flaked on both sides (bi = two, face = side).
    • (d) Core (main block) and flake (small chip removed from core) were the basic stone tools.

VII. Answer in detail

20. Developments in agriculture, pottery, and metal tools considered a landmark in the Megalithic period — Substantiate.

    • People used iron technology; an exchange relationship developed.
    • They had knowledge of metallurgy and pottery making.
    • Burials with large stones for the dead.
    • Weapons: swords, daggers, axes, chisels, lamps, tripod stands.
    • Iron tools used for agriculture, hunting, gathering, and battles.
    • Bronze bowls, vessels with animal/bird finials, bronze mirrors, and bells found.
    • These developments together make the Megalithic period a landmark.

21. The history of humans is closely related to the history of the earth — Elucidate.

    • Earth's upper layers contain geological, archaeological, and biological records.
    • Fossil bones of human ancestors are embedded in earth's layers.
    • Palaeoanthropologists and archaeologists excavate soil and rock layers.
    • Layers and fossils are scientifically dated to study stages of human evolution.
    • Through gathered evidence, they reconstruct human history in chronological order.

11. Common mistakes

• Mistake: Saying the Orang-utan is genetically closest to humans. Fix: The Chimpanzee is genetically closest to humans among the great apes.
• Mistake: Agriculture began in the Mesolithic period. Fix: Agriculture and animal domestication began in the Neolithic period. Mesolithic is the Middle Stone Age.
• Mistake: "On the Origin of Species" was by Herbert Spencer. Fix: It was published by Charles Darwin. Spencer coined "survival of the fittest."
• Mistake: Payyampalli Neolithic site is in Chennai district. Fix: Payyampalli is in Vellore district.
• Mistake: Flake = tool with flaking on both sides. Fix: A biface has flaking on both sides. A flake is a small chip removed from a core.
• Mistake: Geology = study of stone tools. Fix: Geology studies the Earth. Lithic technology studies stone tools.

12. Quick revision

• History Ch 1 · Evolution of Humans and Society — Prehistoric Period.
• Earth formed 4.54 billion years ago. Hominin origins traced to Africa.
• Chimpanzee is genetically closest to humans.
• Homo habilis → Homo erectus → Homo sapiens (modern humans).
• Stone Ages: Palaeolithic (hand axes, cleavers) → Mesolithic (microliths) → Neolithic (agriculture, polished Celts).
• Neolithic = beginning of agriculture and animal domestication.
• Iron Age / Megalithic: large stone burials, iron tools, bronze artifacts.
• Tamil Nadu sites: Athirampakkam (Palaeolithic), Adichanallur & Porunthal (Megalithic rice evidence).
• Sir Robert Bruce Foote discovered Palaeolithic tools at Pallavaram, Chennai.
• Fertile Crescent = Egypt + Israel-Palestine + Iraq.