Class 9 Practice Level 3 – Why do we fall ill set – 2 Leave a Comment / By anushka kumari / July 12, 2024 Class 9 Practice Level 3 – Why do we fall ill set – 2 Total questions: 29 1. How do prions differ from other infectious agents? They are visible under a light microscope. They have both DNA and RNA. They contain no genetic material. They replicate outside a host cell. None 2. Which type of immunity involves the transfer of antibodies from one individual to another? Active immunity Innate immunity Adaptive immunity Passive immunity None 3. Which mechanism allows bacteria to become resistant to multiple antibiotics? Horizontal gene transfer Spontaneous mutation Reduced permeability to antibiotics Efflux pumps None 4. Why is it challenging to develop a vaccine for HIV/AIDS? HIV mutates rapidly. HIV is not contagious. HIV does not stimulate an immune response. HIV only affects animals. None 5. How does hypertension contribute to the development of cardiovascular diseases? By increasing oxygen levels in the blood By reducing blood flow to the brain By causing damage to blood vessels By lowering cholesterol levels None 6. What is the primary reason for the resurgence of vector-borne diseases in certain areas? Overuse of vaccines Increased use of antibiotics Environmental changes and urbanization Improved sanitation None 7. What is the role of cytotoxic T cells in the immune system? To produce antibodies To phagocytize pathogens To destroy infected host cells To activate B cells None 8. Which autoimmune disease is characterized by chronic inflammation of the joints? Multiple sclerosis Rheumatoid arthritis Type 1 diabetes Lupus None 9. Which deficiency is linked to impaired cognitive development in children? Vitamin C Iodine Vitamin D Calcium None 10. How does indirect transmission of disease occur? Through direct contact with an infected individual Through vectors such as mosquitoes Through airborne droplets Through contaminated surfaces or objects None 11. What is the purpose of booster shots in vaccination programs? To treat existing infections To provide lifelong immunity To enhance and prolong the immune response To increase the dosage of the vaccine None 12. What is the significance of calculating the basic reproduction number (R0) of a disease? To determine the severity of symptoms To measure the average number of secondary infections produced by one infected individual To estimate the cost of treatment To identify the mode of transmission None 13. How does chronic inflammation lead to cancer? By increasing antibody production By causing frequent infections By inducing DNA damage and promoting cell proliferation By strengthening the immune system None 14. Which public health strategy is most effective in preventing the spread of a pandemic? Reducing funding for healthcare Encouraging mass gatherings Implementing travel restrictions and social distancing Ignoring health guidelines None 15. Which autoimmune disorder results in the demyelination of nerve cells? Type 1 diabetes Rheumatoid arthritis Multiple sclerosis Lupus None 1 out of 15 Time's up
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