Health and Hygiene Quiz - ICSE Class 8 Science
Free practice quiz: Health and Hygiene (ICSE Class 8 Science). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is the primary function of antibodies in the human immune system?
- To transport oxygen to tissues
- To neutralize or eliminate pathogens
- To produce energy for cellular processes
- To regulate blood sugar levels
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Answer: B. To neutralize or eliminate pathogens
Antibodies are Y-shaped proteins produced by B cells (a type of white blood cell) that are specific to particular antigens found on pathogens. They bind to these pathogens, marking them for destruction by other immune cells or directly neutralizing their harmful effects.
Which of the following is a non-communicable disease that is often linked to lifestyle factors such as poor diet and lack of exercise?
- Tuberculosis
- Malaria
- Diabetes Mellitus Type 2
- Influenza
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Answer: C. Diabetes Mellitus Type 2
Type 2 Diabetes Mellitus is a chronic condition where the body doesn't use insulin properly. While genetics play a role, lifestyle factors like obesity, sedentary behavior, and an unhealthy diet significantly contribute to its development.
The symptoms of conjunctivitis ('pink eye') often include redness, itching, and discharge from the eyes. This condition is most commonly caused by:
- Bacterial or viral infections
- Allergic reactions
- Exposure to irritants like smoke
- All of the above
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Answer: D. All of the above
Conjunctivitis is inflammation of the conjunctiva, the thin membrane that lines the eyelid and covers the white part of the eye. It can be caused by various factors, including bacteria, viruses, allergies, and irritants.
What is the primary function of the alveoli in the lungs?
- To filter air and trap dust
- To produce mucus to lubricate airways
- To facilitate the exchange of oxygen and carbon dioxide
- To regulate the temperature of inhaled air
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Answer: C. To facilitate the exchange of oxygen and carbon dioxide
Alveoli are tiny, thin-walled sacs in the lungs where gas exchange occurs. Oxygen from the inhaled air passes through the alveoli into the bloodstream, while carbon dioxide from the blood passes into the alveoli to be exhaled.
Which type of vaccine uses a weakened, live version of a virus or bacterium to stimulate an immune response?
- Inactivated vaccine
- Toxoid vaccine
- Subunit vaccine
- Live-attenuated vaccine
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Answer: D. Live-attenuated vaccine
Live-attenuated vaccines contain a weakened form of the pathogen that can still replicate but does not cause serious illness in people with healthy immune systems. Examples include the MMR (measles, mumps, rubella) vaccine and the chickenpox vaccine.