Class name Subject Book title Chapter number Content Created at
Class XII Biology Biology 6 one example of adaptive radiation. 9. Can we call human evolution as adaptive radiation? 10. Using various resources such as your school Library or...
Class XII Biology Biology 7 Chapter 7 Biology is the youngest of the formalised disciplines of natural Human Health and Disease science. Progress in physics and chemistry proc...
Class XII Biology Biology 7 This is what early Greeks like Hippocrates as well as 7.4 Cancer Indian Ayurveda system of medicine asserted. It was thought that persons with ‘bla...
Class XII Biology Biology 7 is adversely affected, characterised by appearance of various signs and symptoms,wesaythatwearenothealthy,i.e.,wehaveadisease.Diseases can be broad...
Class XII Biology Biology 7 to spread typhoid for several years through the food she prepared. Bacteria like Streptococcus pneumoniae and Haemophilus influenzae are responsibl...
Class XII Biology Biology 7 is responsible for the chill andhighfeverrecurringeverythreetofourdays.WhenafemaleAnopheles mosquito bites an infected person, these parasites ente...
Class XII Biology Biology 7 filariasis (Figure 7.2). The genital organs are also often affected, resulting in gross deformities. The pathogens are transmitted to a healthy Fig...
Class XII Biology Biology 7 on mosquito larvae, spraying of insecticides in ditches, drainage areas and swamps, etc. In addition, doors and windows should be provided with wir...
Class XII Biology Biology 7 epithelium lining the respiratory, gastrointestinal and urogenital tracts also help in trapping microbes entering our body. (ii)Physiological barri...
Class XII Biology Biology 7 types of our acquired immune response – antibody mediated. The second type is called 135 cell-mediated immune response or cell-mediated immunity (C...
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...