CBSE Class 12 (Science) Human Health and Disease — practice questions
99 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Human Health and Disease in the app →Antibodies are produced byAntibodies passed from a mother to her infant through breast milk give the infantVaccination provides protection against future infection mainly byHIV primarily infectsThe spread of cancer cells from the original site to distant organs is calledCervical cancer is most commonly caused byPolio is caused by:The vector that transmits MALARIA is:According to WHO, health is best defined as:Innate immunity is best described as:The MOST ABUNDANT antibody class in human blood is:HPV (Human Papillomavirus) is a known cause of:Which of these is a common opioid drug of abuse?Typhoid fever is caused by:Which statement best defines health?Disease-causing organisms are collectively calledTyphoid fever in humans is caused by which organism?Which test is used to confirm typhoid fever?Sustained high fever in typhoid typically reaches aboutPneumonia mainly affects which part of the lungs?Which pair of bacteria is responsible for pneumonia in humans?The common cold is caused by which group of viruses?Malaria is caused by a tiny protozoan namedWhich Plasmodium species causes the most serious, malignant malaria?Plasmodium enters the human body in which infectious form?The chill and fever of malaria recur because RBC rupture releasesMalarial chill and fever recur at intervals of aboutIn the mosquito, Plasmodium sporozoites are stored in thePlasmodium first multiplies within which human cells?Amoebic dysentery is caused by the protozoanWhich helminth is known as the common round worm?Elephantiasis is caused by the filarial wormFilarial worms usually cause chronic inflammation of theRingworm is caused by fungi of which genera?Which symptom marks ringworm infection?Which fish is introduced in ponds to feed on mosquito larvae?Aedes mosquitoes are vectors of which pair of diseases?Which deadly disease has been completely eradicated by vaccination?The overall ability of the host to fight disease-causing organisms isWhich type of immunity is non-specific and present from birth?Skin and mucus coating of epithelium are examples of which barrier?Stomach acid, saliva and tears belong to which innate barrier?Neutrophils, monocytes and macrophages that phagocytose microbes form theInterferons secreted by virus-infected cells form which barrier?Which immunity is pathogen specific and shows memory?The intensified response on a second encounter with a pathogen is theWhich cells produce antibodies in response to pathogens?What is the role of T-cells in antibody production?Antibody-mediated immune response is also known asCell-mediated immunity is carried out by which cells?Rejection of a transplanted graft is due to which response?Immunity from antibodies made in the host after antigen exposure isGiving ready-made antibodies to the body produces which immunity?Colostrum is rich in which antibody type?Antibodies passing from mother to foetus through the placenta giveA vaccine usually containsFor a deadly infection like tetanus, what is injected directly?Antivenom given after a snakebite provides which kind of immunisation?The hepatitis B vaccine is produced by recombinant DNA technology inWhich describes an allergy?Antibodies produced against allergens are of which type?Mast cells release which chemicals in an allergy?Which drug quickly reduces symptoms of an allergic reaction?Rheumatoid arthritis is an example ofWhich two organs are the primary lymphoid organs?Which of these is a secondary lymphoid organ?The thymus lies near the heart andWhich organ filters blood and holds a large reservoir of erythrocytes?Which structures trap antigens that enter the lymph and tissue fluid?MALT in the lymphoid system stands forIn AIDS, the word acquired indicates that the disease isAIDS was first reported in which year?HIV belongs to which group of viruses?HIV/AIDS is spread only throughThe usual time-lag between HIV infection and AIDS symptoms is aboutWhich enzyme makes viral DNA from HIV RNA inside the host?Which infected cells keep producing virus like an HIV factory?In AIDS, the number of which cells progressively falls?A widely used diagnostic test for AIDS isAnti-retroviral therapy for AIDS can onlyWhich step helps prevent the spread of HIV?Which property stops normal cells from growing uncontrolled on contact?Tumours that stay at their original site and cause little damage areSpread of cancer cells to distant sites forming new tumours is calledPhysical, chemical or biological agents that induce cancer are calledChemicals in tobacco smoke are a major cause of which cancer?Cancer detection through stained thin sections of tissue is calledWhich scanning method uses strong magnetic fields and non-ionising radiation?Which technique builds a three-dimensional view of the inside of an object using X-rays?Which tests help detect leukemias through raised cell counts?Which is a common approach for treating cancer?Heroin, commonly called smack, is chemicallyMorphine is extracted from the latex of which plant?Heroin acts on the body mainly asMarijuana, hashish, charas and ganja are obtained fromCocaine interferes with transport of which neurotransmitter?Smoking affects blood oxygen byWhich age span is thought of as adolescence?An unpleasant syndrome that follows abrupt stopping of a regular drug dose is