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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 we breathe, in thsoil, in food, ih water used for drinking or bathing and on all the objects we come in contacwith. You will be surprised to know that billions of them live on the skin of our body and inour mouths and intestinal tracts. One third of the dry human faeces is bacteria. However, only some of these micro-organisms cause infectious diseases. There are many others whicare beneficial and their activities are of central importance to the biosphere. Without them life on earth would perish! Long before we even knew of their-existence, we have been taking advantage of their activities, as in the case of making curds, and alcohol or baking cakes and bread. They decompose dead plants and animals, as well as sewage into harmlesbut indispensable chemicals like nitrogen, oxygen and carbon dioxide etc. They can also bused as biological factories to produce antibiotics.
In fact, the famous antibiotic, penicillinwas discovered from a culture of fungus. Certain kinds of bacteria live in human intestinesand provide vitamin B,, and vitamin K. Thus, though some microbes are harmful, athers aof great service to humanity. While the knowledge of gems has grown and some of it is used to save people from disease and death, several countries have used this knowledge fodestruction and warfare. You may have heard the word "geim warfare". These countries have collected deadly gems which can be spread in enemy countries to pollute air or wateor even to destroy crops and forests. Such warfare, obviously, kills people, not just soldierand as such it is internationally prohibited.
Rockets or Launch Vehicles: Every flight into space begins with a rocket launching. The rocket can lift a satellite or spaceship carrying human beings and equipment into space
how are the earth''s layers formed?
Explain how Insulin Secretion Regulated It is interesting to note that blood sugar level itself controls insulin secretion. How? When blood sugar level rises, insulin secretion
Explain Hypoxia and its Types Hypoxia is the oxygen deficiency at the tissue level below the physiological level. There are four types of hypoxia. Let's get to know them. 1.
ht are the examples oof a solution and its characteristics?
Night Sky: When you look up at the sky on a clear night, what do you-see? Most of it is dotted with twinkling stars. You may see the moon or Venus as a bright point or Mars as
why sea water have high salinity compared with pond water
What causes winds? An uneven heating of the Earth's surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Th
Define Minerals - Calcium, Phosphorous and Iron? Minerals are inorganic substances. This means they are not formed by living matter and contain no carbon. Minerals used in the
Scientific approach to problem solving: The scientific method and the features of scientific knowledge described above are in no way restricted to the domain of scientists alo
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