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Geometry and Astronomy:
The need to portray an ideal world of perfect forms and proportions led to the development of geometry by Pythagoras (583-500 B.C.) and Hippocrates of Chios (about 450 B.C.) (Fig.). 'The latter occupied himself with the solution of problems which were unanswered for a long time. such as squaring the circle and doubling the cube. He failed in both. but opened the w;ly to study the geometry ofcurves. Eudoxus (408-355 B.C.) was probably the greatest Greek matliematician and he was able to explain the motion of sun, moon and plancts by means of sets of concentric spheres, each rotatingabout an axis fixed in the one outside it (Fig. 3.12). The model wascrude, and too simple to explain observed facts, even as known at that time. But the sets of actual metal spheres based on this mode provided the basis for most of the astronomical instruments for a long time.
Microbes: You should know that invisible microbes are present everywhere, because they can surviveeven under very inhospitable conditions. They are all around us, in the air
Explain Specific Defence Mechanism In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the
Fire Alarms : Most modern fire alarm systems are electric and can be activated from several points throughout a building. These points usually consist of glass-covered switches wh
How has the earth changed since it was formed? Ans) The earth has changed particularly since it was formed. Earth was a ball of rock that was strike and changed by loads of imp
An experiment with a loop of thread Rinse a dinner plate methodically and then fill it with water. Make a loop with thread, open it a little and float it on the water. Touch th
Define the Prolactin Prolactin is synthesized in lactotroph cells of anterior pituitary gland during pregnancy and during the entire period of milk production after the birth o
To show which types of soil hold water best Tie cloth over the end of various lamp chimneys and then fill every one to within 8 cm of the top with dissimilar types of soil. Use
would sandstone or quartzite break easier?
if a population of deer found a new food source in there ecosystem what would be the most likely outcome
three adaptations that help humans have differential survivability, and three adaptations that help humans have differential fecundity.
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