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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.
Explain the law of diminishing return. The increase in the yield by a unit increase of the deficient factor is proportional to the decrease from maximum.
#2 DESCRIBE THE APPEARANCE OF THE STOMATE AND THE GUARD CELLS.
Non-renewable Resources: After learning about the renewable resources like water, forests etc., you would like to know what our non-renewable resources such as land, mineral,
INTRODUCTION : You have studied about the hazards of electricity in Unit 11 of Block 3. You have learnt that most of the electrical accidents like shock, fire, etc. occur often du
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Fingerprinting the Stars: Astronomers use various methods to measure the distances to stars. For determining the distances to nearby stars, the method of stellar parallax is
Personal safety : You would recall that there are mainly three routes through which the harmful substances can enter the human body. These are, direct contact followed by penetrat
Lowing soap bubbles with hydrogen Mix up a strong soap solution that will make good soap bubbles. Place a small funnel tube or a clay pipe on the delivery tube. When you have a
I really need help on cells
Minerals Minerals like coal, iron, copper, steel etc. are used in all kinds of industries and in every-day life. The rate of consumption of minerals is increasing every year.
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