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Air Borne Diseases:
A number of diseases are caused due to bacteria and virus that are carried in the air. When an infected person sneezes or coughs, there is a noticeable spray of drops. These tiny droplets of liquid contain germs which can remain afloat in the air for a long period. If another person is standing by, he is likely to breathe in quite a lot of such geps and thus get infected. One sick person can thus infect a lot of others. The common cold virus is spread in this way. In Table are given diseases that are spread in various ways. As listed, leprosy is also spread in similar way. But it spreads only if the Victim remains very close to the diseased person for a long period, and it takes very long time for the symptoms to develop. These diseases spread easily in damp closed spaces.
Moisture comes from home plants Place a cellophane bag over a leaf of some house plant or garden plant and close the end about the stem with a rubber band. Make an observation
classification of animals
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Important physico-chemical properties of biotin include the following: a) It forms colourless, needle shaped crystals. b) The vitamin is sparingly soluble in cold water
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Give Some examples of minerals used in everyday life? There are many minerals that are used in everyday life. We will discuss a few common examples of minerals and how they ar
What is the name for a roughly circular coral reef enclosing a shallow lagoon: atoll
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