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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.
what is scientific method
Define the Pons Varolli Look at Figure Situated in front of the cerebellum below the midbrain and above the medulla oblongata, is the pons. It is involved in motor control and
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
ACCIDENT REPORTING To start with, let us explain two closely related words, accident and incident. Accident is an unexpected or unplanned event. It may cause i) Harm to s
Check-in Sequences At the time of opening the lab, the following need to be kept in mind: 1. Ensure that the door locks have not been tampered. If any tampering is detected
Proteins may be classified broadly into three groups: a) Simple proteins, b) Conjugated proteins, and c) Derived proteins.
High voltage power supply
Q. What is the major source of fresh water in the city/town/village where you live? Answer : River is a major source of fresh water.
Define Inzmunoglobulin D - classification of antibodies Present on surface of B lymphocytes, along with IgM plays a role in Ag recognition.
What is International Enzyme International Enzyme :- the amount of enzyme that catalyses the transformation of 1 mole of substrate into product in 1 minute.
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