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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 the invaders. These W.B.Cs. are of different kinds and each kind consists of millions of cells which recognise and combat a specific foreign invader. Once a class of W.B.Cs. has encountered a particular kind of invader, it develops memory and is thus trained to ward off future attacks. In this way the body becomes "immune" to that infection and the process is called immunisation. Thus, our body regularly develops natural immunity as a variety of fighting cells are produced by actual attacks of infectious agents. Artificial immunisation is a clever idea. It is done through "vaccination", that is by artificial introduction into the body of a weak infection, which triggers off a defence mechanism, and produces W.B.C. trained to combat that particular infection.
What is shale? It is a fine-grained, earthy, sedimentary rock like clay, but produced in thin layers.
Question: a) How does temperature changes in the stratosphere? Give a physical explanation and illustrate your answer using a diagram. b) Write a short note on ozone in the
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If rate of evaporation affects the size of crystals that grow from solution allowed to evaporate at room temperature.
Beyond the milky Way Galaxy: Let us now move away from the Earth and venture into the space beyond. If we were at a point far out in space we would see scattered in space, a
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What reacts with zirconium/
The rain cycle You can reproduce the rain cycle in miniature in your classroom. Place a box of plant seedlings on the table. Place a metal tray about 35 to 40 cm above the box
Explain the Gonadotropic Hormones (GTH): There are two gonadotropic hormones which regulate gonadal functions. They are follicle stimulating hormone (FSH) and luteinizing hormo
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