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Agriculture on a large scale:
Crops had to be planted and harvested in the right season. Floods were a recurrent phenomenon in the river valleys, for which it was essential to be prepared beforehand. The observation of sun and stars to fix the length of a year became so precise that already in 2700 B.C., the Egyptians were able to fix it at 365.2422 days! Sumerians and their successors in Mesopotamia adjusted t'he solar (sun-based) and lunar (moon-based) calendars through accurate observations. They invented the sexagesimal system of 360 degrees in a circle (near enough to the days in a year), 60 minutes in an hour, 60 seconds in a minute. The exercises were carried out using mathematical tables and ied to algebra and arithmetic of the later epochs. Another occupation that came to be very prestigious with the growth of cities was that of medicine. Although the practice of medicine was limited to treating wounds, dislocations, fractures etc., the practitioners could successfully diagnose many diseases. They could compare cases with one another, notice different diseases and record them. From such descriptions, orally passed on to later generations, arose the sciences of anatomy and physiology. Practitioners of medicine also had the knowledge of plants and mineral substances to prepare drugs for various diseases. They grew plants and herbs for this purpose. It is from this source that the science of botany arose later. The basis for chemistry was laid in the observations and practices of jewellers, metal- workers and potters. They knew about at least nine chemical elements-gold, silver, copper, tin, lead, mercury, iron, sulphur and carbon, and also about a variety of dry and liquid reagents. The process of smelting ores, of purifying metals, of colouring them, of adding enamel%-all involve complex chemical reactions that were learnt by many trials and experiments. However, chemistry never rose to the rank of a recognised science in the 'Bronze Age.
REGULATIONS CONCERNING SAFETY AND HEALTH OF WORKERS IN INDUSTRIAL LABORATORIES The workers in industry engaged in using or producing chemicals, coal, high temperature, intense
What is a chemical compound? By definition, a compound is a substance in which two or more different elements have combined. There are millions of examples of compounds all aro
Dissolution and dilution : Water soluble1 miscible chemical wastes which are harmless in high dilution may be run into the drainage with plenty of water. It may be noted that al
it is with osmosis and diffusion what''s number 11
What are the heat sources in the earth?
Q. What are the important processed pulse products? Puffed chickpea and pea, besan, papads, pulse-based weaning foods, quick cooking dhals, and canned dry peas are the importa
Give a rock name for sample. Note that the colour of this type of rock varies greatly, depending on the abundance of organic matter and iron oxides. Samples are both carbonate rock
Although certain physiological aspects of disposition of substances by organs within the body had received atten-tion earlier, it was in 1937, with the seminal work of Teorell, tha
_____ are often responsible for clogging pores and causing pimpiles
Explain Inhibitory Factors Haemopoiesis may be inhibited by a decrease in the live1 of stimulatory growth factors. Generally there is a competition. No particular substance ca
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