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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.
Life in Forests: Trees are the pillars of the forest upon which much of the other forest life is shaped. Associated with them, there may be more than a thousand kinds of s
Coenzyme : A molecule that binds to an enzyme and is essential for its activity, but is not permanently altered by the reaction. Many coenzymes are derived from vitami
Science and Technology during the Renaissance: This phase in the history of science was one of description and criticism. First came the exploration of ancient knowledge, mainly o
modes of nutrition and their examples
Explain two types of transferases ? a) Alanine aminotransferase Alanine + a-ketoglutarate ↔ glutamate + pyruvate b) Aspartate aminotransferase (AST) Asparate + a-ketogl
what are the 7 characters of pea plants observed by mendal?
Explain the Menstrual Phase - Menstrual Cycle If the ovum is not fertilized, a high level of progesterone in the blood inhibits the activity of pituitary gland and the producti
Kepler's Laws of Planetary Motion: Further support to the heliocentric model came from the work of Johannes Kepler at around the same time as Galileo's observations. Kepler, a
if 120g of a 6% sucrose solution are needed, what mass of sucrose is required to prepare the solution?
Some Physical Features of the Oceans: The oceans are so vast that they stagger one's imagination. They cover more than 70 per cent of the earth's surface. The depth of ocean
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