A Textbook of Agronomy - download pdf or read online

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By B. Chandrasekaran; K. Annadurai; E.Somasundaram

ISBN-10: 812242743X

ISBN-13: 9788122427431

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Extra resources for A Textbook of Agronomy

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Laurasia was made of the present day continents of North America (Greenland), Europe, Angara land comprising Russia, Siberia and China in the north. Gondwanaland was made of the present day continents of South America, Africa, India, Australia, and Antarctica. Notice that at this time India was not connected to Asia. The huge ocean of Panthalassa remained but the Atlantic Ocean was going to be born soon with the splitting of North America from the Eurasian Plate. ‘The Triple Junction’ was formed because of a three-way split in the crust allowing massive lava flows in three directions and poured out lava over hundreds of square miles of Africa and South America.

Iv) Homo sapiens - The modern man was 5′4″ tall with a receding chin and heavy eyebrow ridges. He cooked his food, but no houses yet but only semi-nomadic. Some nuclear DNA sequences (including Y-chromosome data) and mt DNA indicate that modern humans originated and migrated relatively recently from a subset of the African population, putting Africa as the home of modern humanity. A study of human Y-chromosome variation in a worldwide sample of over 1,000 men determined that Africans and non-Africans shared a common ancestor 59,000 years ago and that the non-African branch of humanity left Africa about 44,000 years ago.

All their requirements would have come from their prey which also included bison, horses, reindeer, birds, fish, arctic foxes and hares. Vegetable foods would have formed a minor supplement. They even built huts from carefully interlocked mammoth bones covered with skins. A typical Australian aborigine’s catch for the day may include snakes, lizards, anteaters, frogs and grubs, and a wallaby or two. Semang people of Malaysia rely on small creatures (fish, birds, rats, squirrels, lizards and sometimes wild pigs, tapirs and deer), wild plants (nuts, berries, fruit, leaves, shoots, and tubers) and honey collected from the forest.

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A Textbook of Agronomy by B. Chandrasekaran; K. Annadurai; E.Somasundaram

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