Agriculture on a large scale, Science

Assignment Help:

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.  


Related Discussions:- Agriculture on a large scale

Explain the chemical control of respiration, Explain the Chemical Control o...

Explain the Chemical Control of Respiration Let us now focus on the chemical control of respiration. But before that, let's get to know which chemicals are involved in this pro

Explain agglutination - antigen-antibody interaction, Explain Agglutination...

Explain Agglutination - Detection of Antigen-Antibody Interaction Agglutination - If Ag is present on the surface of cells, or can be made to coat these surfaces of cells, thes

Explain reduction reaction, Reduction reaction Aldoses and  ketoses are...

Reduction reaction Aldoses and  ketoses are  reduced  to  the corresponding polyhydroxy  alcohols by sodium borohydride, sodium amalgam, etc. So,  in  this  reaction,  glucose

Introduction electricity and water in a laboratory, INTRODUCTION : Gas, El...

INTRODUCTION : Gas, Electricity and water are integral parts of any science laboratory. You would have realised from personal experience (if any) and in the course of your study o

Explain the porphyrins in the urine, Explain the Porphyrins in the urine ...

Explain the Porphyrins in the urine Porphyrins (a group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration

Explain the conditions for ventricular fibrillation, Explain the Conditions...

Explain the Conditions for Ventricular Fibrillation Ventricular fibrillation may be seen in the following two conditions: 1) When a person is electrocuted, and 2)  As a c

What forces are important for generating wind, Question: a) Define atmo...

Question: a) Define atmospheric pressure, stating clearly its unit in meteorology. The atmospheric pressure at the foot of hill is 1013 hPa. What would be the pressure at th

State the process of formation of acid soils, State the process of Formatio...

State the process of Formation of Acid Soils The soil acidity is mainly caused by hydrogen and aluminium ions, depending upon the degree of existing soil acidity. At very low p

Precipitation, how much precipitation is there in the tundra

how much precipitation is there in the tundra

Why does a glacier move, Why does a glacier move? It moves due to the h...

Why does a glacier move? It moves due to the huge pressure of the ice and snow lowers the freezing point of its lower layers, causing them to melt.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd