Class name Subject Book title Chapter number Content Created at
Class XII Biology Biology 7 of immunisation or vaccination is based on the property of ‘memory’ of the immune system. In vaccination, a preparation of antigenic proteins of pa...
Class XII Biology Biology 7 with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce...
Class XII Biology Biology 7 is shown in Figure7.5. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. The thymus is a lobed o...
Class XII Biology Biology 7 RNA genome (Figure 7.6). Transmission of HIV-infection generally occurs by (a) sexual contact with infected person, (b) by transfusion of contamina...
Class XII Biology Biology 7 option. Moreover, HIV infection, more often, spreads due to conscious behaviour patternsandisnotsomethingthathappensinadvertently,likepneumonia or ...
Class XII Biology Biology 7 other cells inhibits their uncontrolled growth. Cancercellsappearstohavelostthisproperty.Asaresultofthis,cancerous cells just continue to divide gi...
Class XII Biology Biology 7 Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the...
Class XII Biology Biology 7 which are commonly abused are opioids, cannabinoids and coca alkaloids. Majority of these are obtained from flowering plants. Some are obtained fro...
Class XII Biology Biology 7 constitutes drug abuse. Reprint 2026-27 BIOLOGY Smoking also paves the way to hard drugs. Tobacco has been used by human beings for more than 400 y...
Class XII Biology Biology 7 experiment. This is complicated further by effects that might be perceived as benefits, of alcohol or drug use. Thus, the first use of drugs or alc...
Class XII Biology Biology 7 becomes dependent on their use. Dependence is the tendency of the body to manifest a characteristic and unpleasant withdrawal syndrome if regular d...
Class XII Biology Biology 7 transferred from one person to another by sharing of infected needles and syringes. Both AIDS and Hepatitis B infections are chronic infections and...
Class XII Biology Biology 7 in time. In this regard, the parents and the teachers have a special responsibility. Parenting that combines with high levels of nurturance and con...
Class XII Biology Biology 7 psychologists, psychiatrists, and deaddiction and rehabilitation programmes to help individuals who have unfortunately got in the quagmire of drug/...
Class XII Biology Biology 7 of alcohol and drugs, and their perceived benefits like relief from stress, a person may try taking these in the face of peer pressure, examination...
Class XII Biology Biology 7 alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher. 17. In your view what motivates youngsters to take to alc...
Class XII Biology Biology 8 CHAPTER 8 MICROBES IN HUMAN WELFARE 8.1 Microbes in Household Products 8.2 Microbes in Industrial Besides macroscopic plants and animals, microbes ...
Class XII Biology Biology 8 you think that all microbes are harmful; several microbes are useful to man in diverse ways. Some of the most important contributions of microbes t...
Class XII Biology Biology 8 the microbes used. For example, the large holes in ‘Swiss cheese’ are due to production of a large amount of CO 2 by a bacterium named Propionibact...
Class XII Biology Biology 8 retard the growth of other (disease-causing) microbes. You are familiar with the commonly used antibiotic Penicillin. Do you know that Penicillin w...
Class XII Biology Biology 8 This is because the bottled juices are clarified by the use of pectinases and proteases. Streptokinase produced by the bacterium Streptococcus and ...
Class XII Biology Biology 8 is pumped into it. This allows vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments to form m...
Class XII Biology Biology 8 the globe. This methodology has been practiced for more than a century now, in almost all parts of the world. Till date, no manmade technology has ...
Class XII Biology Biology 8 (a part of stomach) of cattle. A lot of cellulosic material present in the food of cattle is also present in the rumen. In rumen, these bacteria he...
Class XII Biology Biology 8 to the use of biological methods for controlling plant diseases and pests. In modern society, these problems have been tackled increasinglybytheuse...