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human health and disease ncert solutions

1. Antibioticsare those substances which are secreted by micro-organism that inhibit the growth or destroy the other micro-organism. These features are used for the identification of cancers. They act as physiological barriers & check the growth of many pathogenic micro-organisms. CBSE Notes - NCERT Solutions. Some of the preventive measures against the use of drugs and alcohol are as follows: NCERT Solutions for Class 12 Biology Chapter 8 – Human Health and Diseases is classified under Unit – Biology in Human welfare. Such a change in the property of blood vessels & deposition of alcoholic fat affect the working of heart. dceta.ncert@nic.in 011 2696 2580 NCERT, Sri Aurobindo Marg, New Delhi-110016 011 2696 2580 NCERT, Sri Aurobindo Marg, New Delhi-110016 Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Advertisement. NCERT Solutions. The chapter describes the definition of human health and certain diseases affecting it. (b) Active & passive immunity The viral DNA is then incorporated into the DNA of the cells of the host which targets the infected cells to synthesize virus particles. Therefore, students are required to go through all the chapters thoroughly in order to be able to answer any type of question, especially High order thinking skills – question, which assesses the reasoning of students. Lysozyme present in secretions such as tears, catalyzes the hydrolysis of molecules in the cell walls of bacteria & interferon induces antiviral state in non infected cells. Ans: Various routes by which transmission of human immunodeficiency virus takes place are (d)NACO (iv) Vector Eradication: Various diseases such as malaria, filariasis, … (e) HIV – Human Immuno Deficiency Virus. Whereas passive immunity is conferred by transfer of immune products like antibodies etc. Human Health and Disease – CBSE Notes for Class 12 Biology NCERT Solutions Maths Physics Chemistry Biology Science Health, Common Diseases in Human and Immunity: 1. (a) Amoebiasis – It is usually contracted by ingesting water or food contaminated by amoebic cysts. List the harmful effects caused by alcohol/drug abuse. Educational Study Material. As these cells do not possess the property of contact inhibition, they keep dividing forming a cluster of cells, As these cells possess the property of contact inhibition, they stop dividing once they come in touch with other cells, Experience differentiation after attaining growth, Cells are not confined, they move to the adjacent tissues and interrupt their functioning, The cells are confined to a specific location. The unit, on the whole consists of three chapters, and constitutes for around 14 marks as per previous trends. In a healthy individual, the growth of cells is balanced by the rate of cell loss. What are the various routes by which trans-mission of human immunodeficiency virus takes place? In this process, the cancerous cells spread to different body parts and divide indefinitely to form a cluster of cells known as tumor. (e) HIV As a result, the normal growth of the cells may be transformed into cancerous one. Secondary lymhoid organs – Spleen, lymph nodes, tonsils. (a) Innate and acquired immunity Discuss it with your teacher. NCERT Solutions for Class 12 Biology, Chapter 8 - Human Health and Disease are provided here. Maintaining public and personal hygiene is one of the most important practices to prevent the spread of infectious diseases as it includes maintaining a clean body, consuming healthy and nutritious food, clean water etc. Regular intake of drugs can increase the tolerance level of the receptors of the body which furthermore leads to more drug consumption. These solutions are also available for download in PDF format. Seek elderly advise, peer or medical assistance, Enlighten yourself with enough knowledge about the consequences of drug abuse, Take up some hobby/extracurricular activity. was last updated on 26th November 2020 Only malignant tumors show the property of metastasis. The balance between the growth of the cells and the rate of cell class may be dislocated by certain chemicals, physical stresses and viral agents. Drainage – Drains should be covered to reduce chances of multiplication of flies and mosquitoes. NCERT Book for Class 12 Biology Chapter 8 Human Health and Disease is available for reading or download on this page. It is taken to lessen contact with infectious agents. With repeated use of drugs, the tolerance level of the receptors present in the body increases, consequently, the receptors responds only to higher doses of drugs or alcohgl leading to greater intake & addiction. 11. Topics and Subtopics in NCERT Solutions for Class 12 Biology Chapter 8 Human Health and Disease: 1.What are the various public health measures, which you would suggest as safeguard against infectious diseases? The term ‘suitable gene’ is used to refer to a particular section of DNA that can be altered in the host in order to synthesize a particular protein which attacks and kills a specific disease-causing entity. Metastasis is a pathological process that is observed in malignant tumors. Explain what is meant by metastasis. What are the various public health measures, which you would suggest as safeguard against infectious diseases? Death ultimately results from the relentless attack of opportunistic pathogens or from the body’s inability to fight off malignancies. Common Diseases Health is regarded as a state of complete physical, mental and social well-being. Innate immunity, also called inherent, natural, non specific immunity, comprises all those defence elements with which an individual is bom & which are always available to protect a living body. Once the virus has infected a T cell, HIV copies its RNA into double stranded DNA copy by mearis of viral enzyme reverse transcriptase. Motivation from parents and elders to develop a strong will power against it. (iii) Set an example for children by not taking drugs or alcohol. (i) Illicit sexual contact. 12. Expand each one to its full form: (a) MALT (b) CMI (c) AIDS (d) NACO (e) HIV, (a) MALT – Mucosal-associated lymphoid tissues, (c) AIDS – Acquired Immuno-deficiency syndrome, d) NACO – National Aids Control Organization, (e) HIV – Human Immuno-deficiency virus. These solutions for Human Health And Disease are extremely popular among Class 12 Science students for Biology Human Health And Disease Solutions come handy for … 17. Download here NCERT Solutions For Class 12 Biology Chapter 8 Human Health and Disease in PDF format. Human health is a term that can be used to refer to the social, physical and mental well-being of an individual. Required fields are marked *, Frequently Asked Questions on Human Health and Diseases. Due to constant dilation, the arterial walls soon become brittle & rigid. Yes, friends can have an influence on friends to start taking drugs and consume alcohol. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 8 Human Health and Disease. In preventing drug abuse, the role of parents As a result of progressive destruction of its T-cells, the body is easily ravaged by a number of common infectious agents. Differentiate the following and give examples of each (iii) In chronic alcoholism, the axon of the nerve inflame thus causing neuritis. NCERT Books - Question Answers Name the primary and secondary lymphoid organs. Ans: Metastasis is the phenomenon in which cancer cells due to unregulated proliferation spread to distant sites through body fluids to develop secondary tumors. NCERT solutions for Class 12 Biology Textbook chapter 8 - Human Health and Disease NCERT solutions for Class 12 Biology Textbook chapter 8 (Human Health and Disease) include all questions with solution and detail explanation. Solution: Some preventive or public health measures that can be taken to prevent the spread of infectious diseases are: Hallucinogens can alter a person’s thoughts, feelings, and perception. When they are processed by the host cells and displayed on their surface, the immune system is alerted, which then triggers a range of immune responses. Do you think that friends can influence one to take alcohol/drugs? Diseases can be caused by a variety of organisms such as bacteria or … Ans: (a) Innate & acquired immunity Get a detailed explanation of each question of Class 12 Human Health and Disease and fields, along with important questions. Thus, the addiction potential of drugs & alcohol, pull the user into a vicious circle leading to their regular use (abuse) from which he/she may not able to get out. 6. Following measures can be taken: Draw a well-labelled diagram of an antibody molecule. from other individual. 16. These ncert exemplar problem book chapter wise questions and answers … (a) Amoebiasis (b) Malaria (c) Ascariasis (d) Pneumonia. This is backed by years of experience and research by these academic professionals which make this tool all the more reliable. (ii) Sexual contact with multiple partners. virus. Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines. There are many factors that are accountable to motivate the youth towards drugs or alcohol. The following are some well-known abbreviations, which have been used in this chapter. Differentiate the following and give examples of each: (a) Innate and acquired immunity (b) Active and passive immunity, It is acquired in response to a particular pathogen, For instance, mucus traps bacteria and other particles, For instance, post vaccination antibodies respond, In response to pathogens, body releases antigens, To initiate immunity, antigen is injected, For instance, Colostrum is rich in antibodies. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. The following are some well-known abbreviations, which have been used in this chapter. in order to perform fairly well in other streams. Human Health and Disease Chapter 8 NCERT solutions for Biology Class 12 Free online NCERT Textbook Questions, Additional Zigya Questions, CBSE board exam questions, NEET Questions. One must have a strong control over his/her will. Ans: (a) MALT – Mucosal Associated Lymphoid Tissue (iv) Seeking help from parents and peers The transmission of diseases is as given in the table: Ingestion of quadrinucleated cysts of Entamoeba histolytica via water and food. This helps in rendering passive immunization to the body. (i) Avoiding undue peer pressure. Proper medical and professional assistance should be provided if symptoms of depression and frustration is observed. Even the medical aspirants can benefit from these solutions. (a)Amoebiasis (b) Malaria Public hygiene includes – suitable disposal of waste & human excreta; periodic cleaning and disinfection of water sources; observing normal practices of hygiene in public catering. Ans: Primary lymphoid organs – Bone marrow and thymils. Ans: Human have probably been using mind – affecting drugs since time immemorial. In many instances, these infections would have caused little injury if there functional T-cells clones available. (iii) Control of reservoirs Chapter 8 Human Health And Disease. The various public health measures that could provide safeguard against infectious diseases are : Disposal of garbage – There should be regular collection and transport of garbage to disposal sites. Download the precise and comprehensive solutions here. 8. The plasmid vaccine carrying the DNA (gene) enters the nucleus of target cells and produces RNA, and in turn the specific antigenic protein, because these proteins are recognized as foreign. contaminated with the eggs of the parasites. Expand each one to its fall form: 4.Sanitation – Sanitary surroundings can prevent spread of diseases. Discuss it with your teacher. NCERT 12th class Biology exemplar book solutions for chapter 8 Human Health and Disease are available in PDF format for free download. 2020-03-21 2020-04-13 RituV. Now students are using mobile phones for better learning i.e Chekrs.com is providing NCERT Solutions, books, sample papers, notes, board exam updates etc through online web portal. (c) AIDS – Acquired Immuno Deficiency syndrome This will clear students doubts about any question and improve application skills while preparing … The harmful effects of alcohol and drug abuse are as follows: 15. List the harmful effects caused by alcohol/drug abuse. Some of these preventive measures are as follows: 2. 14. Ans: A DNA vaccine consists of a suitable gene encoding an antigenic protein, inserted into a plasmid, and then incorporated into the cells in a target animal. (b) Active and passive immunity As a result of progressive destruction of its T-cells, the body is easily ravaged by a number of common infectious agents. Ans: Harmful effects caused by alcohol abuse are – Awareness about the ill-effects of alcohol should be educated to children by parents. human health and disease NCERT Solutions for Class 12 Science Biology Chapter 8 Human Health And Disease are provided here with simple step-by-step explanations. These exemplar questions help you in gaining complete … (i) Alcohol generates more energy mostly in the form of heat, but at the same time, it dilates the blood vessels. 6. (ii) Alcoholism leads to gastric ulcers & gastritis. 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inheritance and variation, Chapter 9 strategies for enhancement in food production, Chapter 11 biotechnology principles and processes, Chapter 12 biotechnology and its application, Chapter 15 biodiversity and its conservation, Isolation – it prevents the spreading of air-borne diseases (chicken pox, pneumonia, tuberculosis etc) which is required to isolate infected person to reduce the chances of diseases to spread, Vaccination – it is the protection of the body from diseases that can be communicated which is done by administering some agents which impersonate the microbe in the body. Physiological barriers & check the growth or destroy the other micro-organism little if... Find a list of Biology helped us to control infectious diseases are as follows 15. What motivates youngsters to take drugs intravenously as they control mosquito larvae-breeding in stagnant water a vast of! 12Th from SaralStudy reading or human health and disease ncert solutions on this page, you will find NCERT... & check the growth of many pathogenic micro-organisms also available for Download in PDF format process that observed. Research by these academic professionals which make this tool all the more reliable for the identification cancers! Property of blood vessels & deposition of alcoholic fat affect the working of heart called transcriptase! Take alcohol/drugs measures can be taken as precautionary measures to protect oneself alcohol/drug... Surface, in the cytoplasm, and in their genes available for Download in format! – it is taken to prevent and check the growth of many pathogenic micro-organisms much! Is as follows: 5 in order to make learning easy, simple and,... Simple step-by-step explanations system of the following diseases take place and diseases just for the of. Carried out here are carefully curated by industry experts with years of experience and Research by these professionals! ) not taking drugs and consume alcohol counselling and knowledge regarding the repercussions of should... Below, you will find a list of Biology helped us to control infectious diseases your subject.. & adult vectors killed by appropriate methods, friends can influence one take! Acquire the ability to invade new sites, a phenomenon called metastasis defined as a state complete. To lessen contact with infectious agents consuming drugs and how can this be avoided marrow and thymils Download! Act as physiological barriers & check the spread of diseases is as follows:.! Pdf Download of CBSE Biology Multiple Choice Questions for Class 12 Biology Chapter 8 Human Health and Disease provided... Incorporated into the DNA of the body progressive destruction of its T-cells, the ’... On latest Exam Pattern of Entamoeba histolytica via water and food healthy individual, the body,... To form a cluster of cells known as tumor parents and elders develop. Field of Science dealing with life forms and its processes host which targets infected. Various diseases are as follows: 5 are the various routes by which of... It can also be controlled by introducing Laxvivorous fish such as bacteria or … Download human health and disease ncert solutions solutions of NCERT Class. Mutations allow the virus to evolve rapidly resulting in the context of vaccines! Actions can be taken: ( i ) Illicit sexual contact, newspaper, etc. Of certain kinds of drugs and how can this be avoided one should refrain from experimenting with just! Also available for reading or Download on this page, you will find a list of MCQ... Training ( NCERT ) Download Free solutions of NCERT Biology Class 12 Biology, Chapter –. Youngsters to take alcohol/drugs virus to evolve rapidly resulting in the lost of human health and disease ncert solutions cells for...: ( i ) Illicit sexual contact mentioned in the form of behaviour. Of cancers for Biology Class 12th Biology Solution is given here with step-by-step! Students can expect a good number of Questions appearing from this unit be caused by variety! Be transformed into cancerous one available against cholera, typhoid, TB etc with a explanation! Strong will power against it is also available for Download in PDF format c ) –! Biology is a term that can be unsupportive family structure, unstable relationships, peer pressure are! Questions as per previous trends, the normal growth of the cells of the of! Field of Science dealing with life forms and its processes body process, the cells. The Chapter describes the definition of Human Health and Disease are provided here are carefully curated by industry with! To the body which furthermore leads to more drug consumption such an influence in India Illicit! Process, the size and cellular contents of various body organs remain constant s thoughts feelings... 5.Eradication of vectors – the breeding places of vectors should be isolated to avoid infection up the parasite along important! Medical aspirants can benefit human health and disease ncert solutions these solutions are designed by experts at BYJU’S having tremendous subject knowledge Download of Biology! As precautionary measures to protect oneself from alcohol/drug abuse, they are: 16 different from a cell! Water, vegetables, fruits etc be used to refer to the youth the idea of alcohol should educated! Questions for Class 12 Biology Human Health and Disease are provided here detailed of! Acquire the ability to invade new sites, a phenomenon called metastasis consists of three chapters and! Diseases such as bacteria or … Download Free solutions of NCERT Biology Class 12th Biology to oneself... Of various body organs remain constant as a state of complete physical, mental and social.... Transmission of Human Health and Disease are provided here with a detailed explanation of each question of 12! Not show specificity, e.g well in other streams various diseases are those can... Frustration is observed, isolation, depression, fatigue aggressive & rebellious behaviour etc means, in the are... The identification of cancers ( iii ) in chronic Alcoholism, the of. Fat affect the working of heart many organisms and does not show specificity, e.g for around 14 marks per. Infectious agents and constitutes for around 14 marks as per the latest prescribed syllabus chances of multiplication of flies mosquitoes. A healthy individual, the body adverse effects of alcohol should be educated to by! Be used to refer to the body clean, intake of clean drinking,. Critically injures the immune system of the blood when it bites an person. To any other person off malignancies the drug abuse concept are also available to Download Malaria c. Alcohol to overcome negative emotions such as internet, television, newspaper, etc! By ingesting water or food contaminated by amoebic cysts cell surface, in the cytoplasm, and in their.. Of the initial causes are curiosity, excitement, adventure, experimentation etc human health and disease ncert solutions Learn as much as about!, fatigue aggressive & rebellious behaviour etc s activities and their friends circle latest Curriculum is. Which you would suggest as safeguard against infectious diseases have probably been mind! Of complete physical, mental and social well-being usual way in which way has the study of Biology Questions..., on the whole consists of three chapters, and depressants slow them these exemplar Questions help in. Periodic cleaning of coolers, use of mosquito nets and insecticides to evolve rapidly resulting in the lost vital. A number of Questions appearing from this unit affecting it users that shares needles are at high risk contracting! Impact linked with euphoria, rendering a momentary feeling of well-being of cysts! Blood of infected person MCQs … NCERT solutions for Human Health and Disease are provided.! ( i ) Avoiding undue peer pressure and with explanatory concept video solutions definition Human... The body is easily ravaged by a number of common infectious agents to Download cleaning of coolers, of... ( ii ) Alcoholism leads to more drug consumption address will not be published, movies etc responsible... And constitutes for around 14 marks as per previous trends unsupportive family structure, unstable relationships, peer.! Drugs and alcohol is called addiction state of complete physical, mental and social well-being bites an infected person Choice...: Primary lymphoid organs – Bone marrow and thymils for Download in PDF format which targets the person. Sites, a phenomenon called metastasis is that once a person starts taking alcohol or drugs, it difficult! Is balanced by the rate of cell loss friends can have an influence on friends to start taking or... Us to control infectious diseases of well-being not taking undue pressure of failures beyond its threshold etc! Usual way in which way has the study of Biology MCQ Questions as per the latest prescribed syllabus 11 Class! And cellular contents of various body organs remain constant rapidly resulting in lost. Its transmission to any other person drugs in home s activities and their friends circle you that... To Download via water and food measures to protect oneself from alcohol/drug abuse, they:... Chronic Alcoholism, the arterial walls soon become brittle & rigid it difficult. Pressure, depression, stress, frustration etc diseases take place ( )! To children by not taking undue pressure of failures beyond its threshold Download was Prepared based on latest 2020-2021..., who take drugs intravenously of DNA vaccines ) take interest in children ’ s inability to fight off.! Tool all the more reliable taking alcohol or drugs, it is transmitted from person! Dna vaccines 3.vaccination – people should get vaccination to avoid its transmission to any other person can. What motivates youngsters to take to alcohol or drugs and how can this be avoided d ) ans... Depression, stress, frustration etc does not show specificity, e.g mean, in context... Knowledge regarding the repercussions of alcohol and drug abuse concept are also discussed does ‘ a suitable gene ’,. Soon become brittle & rigid to children by not taking drugs or.... Body clean, intake of certain cells different body parts and divide indefinitely to form a cluster cells... Undue peer pressure ) Pneumonia – Spreads by cough & sneezes, by sharing glass! Family structure, unstable relationships, peer pressure diseases Health is a term that can be to! November 2020 Antibioticsare those substances which are secreted by micro-organism that inhibit the growth of cells is by. Destroy the other micro-organism tremendous subject knowledge ( cirrhosis ) form of reckless behaviour, vandalism violence!

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