Biology and Human Welfare
- Which of the following is not an autoimmune disease ? Answer: 2. Alzheimer's disease In an autoimmune disease the immune system attacks the body's own tissues. Psoriasis, rheumatoid arthritis an... 1
- In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels ? Answer: 1. Elephantiasis Key idea: Filarial worms (Wuchereria) are spread by Culex mosquitoes and live in lymphatic vessels. They cause chro... 1
- MALT constitutes about ______ percent of the lymphoid tissue in human body. Answer: 4. 50% Mucosa-associated lymphoid tissue (MALT) lines the respiratory, digestive and urogenital tracts. It forms about 50% of the ly... 1
- Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections ? Answer: 1. Cell - mediated immune response Graft rejection is due to cell-mediated immune response, carried out by T-lymphocytes that recogn... 1
- Which of the following is correct regarding AIDS causative agent HIV? Answer: 1. HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase. H... 1
- Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids? Answer: 3. Mackerel Mackerel is a marine fish and a good source of omega-3 fatty acids. Mangur (catfish), Mrigala (a major carp) and Mystus... 1
- Which of the following sets of diseases is caused by bacteria? Answer: 4. Cholera and tetanus Cholera and tetanus are caused by bacteria (Vibrio cholerae and Clostridium tetani). Smallpox, mumps, herpes... 1
- Which of the following statements is not true for cancer cells in relation to mutations ? Answer: 4. Mutations inhibit production of telomerase. Cancer cells show reactivation of telomerase, which keeps telomeres from shortening a... 1
- Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain : Answer: 4. Attenuated pathogens Key idea: Antivenom gives readymade antibodies (passive immunity), while polio drops contain attenuated (wea... 1
- In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to : Answer: 3. Auto-immune disease Key idea: When the immune system attacks the body's own cells, it is an auto-immune disease. Examples are rhe... 1