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A lift pump
To change the syringe and make a simple lift pump, burn two holes by the piston with a hot wire and fit a thin piece of leather or rubber above them to act as a valve which closes on the upstroke and yet permits liquid to pass by on the down stroke
Control of soil erosion: The most significant measures of erosion control include (i) growth of grasses, shrubs and trees on soils and (ii) construction of a drainage system w
Intrusion into the Nitrogen Cycle: Human intervention can disturb the nitrogen cycle. Let us see how. When we grow and harvest crops. there is loss of nitrogen from the soi
Personal Protective Devices : We shall now discuss the details of protective devices required for safety in a laboratory. The aim of protective devices is to minimise the risk of
The Fujita Scale is used to classify intensities of: Tornadoes
Procedure : Steps 1 to 3 and step 5 are demonstration steps and will be performed by your counsellor. Observe these steps carefully. 1. The cotton plugs/caps of the test tubes,
Explain in detail about the Viruses Viruses are the ultramicroscopic parasites which always require a living h ost for their multiplication. Since they are much smaller than ba
FACTORS FOR BROAD AREA OF SCIENTIFVC ACTIVITY
Mass communication: The well-known exponent of the role of mass media in development, Dr. Wilbur Schramm, who headed a team of experts to advise the development of infrastr
Procedure 1 . After the dissection experiment is over the dead animals are put in disposable paper bags and the bag is sealed. Animal tissues and excreta should also be put and
Objectives After studying this unit, you should be able to: 1. explain the need for reporting lab accidents, 2. state the accident reporting procedure, 3. list the
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