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Ultraviolet Radiations : The ultraviolet (UV) light has higher energy than visible light. Hydrogen lamps, deuterium lamps and other sources of ultra-violet are used for a variety of purposes in physical, chemical and biological laboratories. These applications include spectroscopy. The sterilisation of instruments, the initiation of chemical reactions and the detection of purines and other substances which fluoresce when irradiated with UV light in chromatography and other separation techniques. Ultraviolet sources may be recognised by their intense pale blue illumination, for example mercury vapour lamps and high voltage sparks and arc emitted at the time of welding.
Neptune The eigth planet, Neptune, was discoveted in 1846 by astronomer Johann Gottfried Galle. We have already told you the story of its discovery in last. It is so f
Observe the surface of the moon :- Use the small telescope or a pair of field glasses. Examine the surface of the moon and see if you can see any of its craters and mountains.
What process do plants build up carbohydrates by?
Hormonal system: Most of us are not even aware that another system works constantly, along with the nervous system and the muscles, to direct our bodily functions. The system
Explain the Submucous Layer This layer consists of loose areolar connective tissue. There are lymph vessels, plexuses of blood vessels and nerves. The nerve plexus is meissner'
does the thickness seed coat effect the groth of the seed???
The buoyancy of water Find a metal can like a coffee can or a cigarette tin which has a tightly fitting cover. With the cover on, push the can into a pail of water, cover end d
Determine about the soil humus The organic constituents (organic colloids) are due to mainly the plants and partly the animals. They form only a small fraction and get transfo
Explain the term- lichens The lichens are able to extract nutrients from the rocks . They are capable of retaining water for a long time during which chemical processes take p
Vaccination: Now let us see how vaccination protects us from disease. We have mentioned above that the W.B.Cs. produce antibodies which neutralise the toxins produced by th
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