CLASS 8 SOCIAL SCIENCE HISTORY CHAPTER 1 HOW, WHEN AND WHERE NOTES How Important are Dates? Historians were fascinated with dates. History is about changes that occur over time, finding out how things were in the past and how things have changed. History was an account of battles and big events. It was about rulers and their policies. Historians wrote about the year a king was crowned, the year he married, the year he had a child, the year he fought a particular war, the year he died, and the year the next ruler succeeded to the throne. For events such as these, specific dates can be determined. Which dates? The dates we select and compose our story of the past are not important. They become vital because we focus on a particular set of events as significant. The chronology of different personalities’ lives marked the different chapters of the history of British India. It is to give each chapter some coherence. It is to tell a story in a way that makes some sens...
Q. 1. In which season, the frequency of irrigation is required at a higher rate? Answer: Watering of crops at regular intervals is called irrigation. The time and frequency of irrigation depend on types of crop, soil and season. In summer, the frequency of watering is higher because in summer temperature is high due to which the rate of evaporation of water from the soil and the leaves increases. Q. 2. Name some sources of irrigation. Answer: The sources of water for irrigation are wells, tube-wells, ponds, lakes, rivers, dams, and canals. Q. 3. In which method of irrigation, there is no wastage of water? Answer: One of the modern methods of irrigation is the Drip system. In this system, the water falls drop by drop directly near the roots of the plants, hence water is not wasted at all. Q. 4. Why are unwanted plants harmful? What are they called? Answer: Undesirable plants which grow naturally along with the crop are called weeds. The weeds are harmful bec...
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