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Human Health and Disease MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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446 questions in this chapter
Question 351 of 446
📘 CLASS XII
In cases of air-borne diseases such as pneumonia, ____ contact with the infected persons or their belongings should be avoided.
Close contact with the infected persons or their belongings should be avoided for air-borne diseases.
Question 352 of 446
📘 CLASS XII
The control of vectors requires avoiding ____ of water in and around residential areas.
Vector control is achieved by avoiding stagnation of water in and around residential areas.
Question 353 of 446
📘 CLASS XII
Antibiotics and various other ____ have enabled us to effectively treat infectious diseases.
Discovery of antibiotics and various other drugs has also enabled us to effectively treat infectious diseases.
Question 354 of 446
📘 CLASS XII
Acid in the stomach and saliva in the mouth are examples of ____ barriers.
Acid in the stomach and saliva in the mouth are physiological barriers.
Question 355 of 446
📘 CLASS XII
Natural killer (NK) cells are a type of ____ involved in cellular barriers.
Natural killer (type of lymphocytes) cells are involved in cellular barriers.
Question 356 of 446
📘 CLASS XII
The ability of the immune system to elicit a secondary response is ascribed to the fact that our body appears to have ____ of the first encounter.
Acquired immunity is characterised by memory, leading to the highly intensified secondary response.
Question 357 of 446
📘 CLASS XII
T-cells themselves do not secrete antibodies but help ____ cells to produce them.
The T-cells themselves do not secrete antibodies but help B cells to produce them.
Question 358 of 446
📘 CLASS XII
During organ transplantation, tissue matching and ____ matching are essential before undertaking any graft.
Tissue matching, blood group matching are essential before undertaking any graft/transplant.
Question 359 of 446
📘 CLASS XII
Patients receiving organ transplants must take ____ all their life to prevent graft rejection.
Even after matching, the patient has to take immuno–suppresants all his/her life.
Question 360 of 446
📘 CLASS XII
The foetus receives antibodies from their mother through the ____ during pregnancy, which is an example of passive immunity.
The foetus receives some antibodies from their mother, through the placenta during pregnancy.
