1. A student describes health as “the absence of any diagnosed disease.” Under the complete concept of health, this description is incomplete because health also requires
ⓐ. physical strength and high athletic performance only
ⓑ. freedom from infectious diseases but not genetic disorders
ⓒ. normal organ function without considering mental or social state
ⓓ. complete physical, mental and social state of well-being
Correct Answer: complete physical, mental and social state of well-being
Explanation: Health is broader than simply being free from disease. It includes complete physical, mental and social well-being. A person may have no diagnosed disease yet still have poor mental or social well-being, so absence of disease alone does not establish good health.
2. Consider two individuals. Person P has no known disease but experiences persistent mental distress and severe social isolation. Person Q has satisfactory physical, mental and social well-being. The complete concept of health most directly supports the conclusion that
ⓐ. Q better satisfies the physical, mental and social concept of health
ⓑ. both P and Q are equally healthy because neither needs hospitalisation
ⓒ. P is healthier because absence of disease is the main criterion
ⓓ. physical condition alone is sufficient to compare their health
Correct Answer: Q better satisfies the physical, mental and social concept of health
Explanation: The relevant concept defines health in terms of physical, mental and social well-being rather than merely absence of disease. Person Q satisfies all three dimensions, whereas Person P has important deficiencies in mental and social well-being. Therefore, Q more completely fits the stated meaning of health.
3. Improvement in the general health of a population is expected to contribute most directly to
ⓐ. reduced work efficiency but increased longevity
ⓑ. greater productivity together with improved economic prosperity
ⓒ. increased maternal mortality because more people survive to adulthood
ⓓ. elimination of all genetic disorders from the population
Correct Answer: greater productivity together with improved economic prosperity
Explanation: Good health improves an individual's capacity to work efficiently and productively. At the population level, increased productivity contributes to economic prosperity. Health improvement does not automatically eliminate genetic disorders, and it is associated with reduced rather than increased maternal mortality.
4. A public-health programme produces better maternal care, improved childhood health and a general increase in longevity. Which additional population-level change would be most consistent with improved health?
ⓐ. Higher infant and maternal mortality
ⓑ. Lower infant and maternal death rates
ⓒ. Greater transmission of infectious diseases
ⓓ. Reduced work efficiency among healthy adults
Correct Answer: Lower infant and maternal death rates
Explanation: Improved population health is associated with greater longevity and lower infant and maternal mortality. Better maternal care, childhood health, nutrition, sanitation and disease prevention reduce avoidable deaths at vulnerable stages of life. A rise in infectious-disease transmission or a decline in work efficiency would indicate worsening rather than improving health, so lower infant and maternal mortality is the consistent outcome.
5. Match each situation with the most appropriate broad determinant of health.
P: An inherited metabolic defect
Q: Exposure to a disease-causing microorganism
R: Persistent unhealthy dietary and activity habits
I: Genetic factor
II: Infection
III: Lifestyle factor
ⓐ. P-I, Q-II, R-III
ⓑ. P-II, Q-III, R-I
ⓒ. P-III, Q-I, R-II
ⓓ. P-I, Q-III, R-II
Correct Answer: P-I, Q-II, R-III
Explanation: An inherited metabolic defect is a genetic determinant because it arises from the individual's inherited biological constitution. Exposure to a disease-causing microorganism represents an infectious determinant, whereas persistent dietary and activity habits are lifestyle-related influences. These categories can interact in real life, but the three situations are most directly matched as genetic factor, infection and lifestyle factor respectively.
6. A previously healthy person begins sleeping poorly, eating an unbalanced diet, avoiding exercise and adopting harmful habits. No new inherited disorder is involved. The resulting health deterioration is best classified primarily as a change in
ⓐ. lifestyle factors
ⓑ. genetic constitution
ⓒ. pathogen taxonomy
ⓓ. congenital immunity
Correct Answer: lifestyle factors
Explanation: Food, rest, exercise and habits are major lifestyle-related determinants of health. Changing these factors can alter health even when a person's genetic constitution remains unchanged. The scenario therefore represents lifestyle influence rather than a new genetic or taxonomic change.
7. A school wants to improve students' personal health practices rather than introduce a community-level disease-control programme. The most appropriate combination is
ⓐ. vaccination drives, sewage treatment, vector elimination and water chlorination
ⓑ. mosquito surveillance, reservoir disinfection and public catering inspection
ⓒ. isolation of infectious cases, insecticide spraying and waste-management legislation
ⓓ. balanced diet, personal hygiene, regular exercise and routine yoga practice
Correct Answer: balanced diet, personal hygiene, regular exercise and routine yoga practice
Explanation: Balanced diet, personal hygiene, regular exercise and yoga are actions that individual students can practise directly to support physical and mental well-being. Vaccination campaigns, sewage treatment, vector control, reservoir disinfection and public-catering regulation require organised community or public-health action. Balanced diet, personal hygiene, regular exercise and yoga therefore fit the personal level of health maintenance, unlike measures that require organised public-health action.
8. A town reports repeated infectious-disease outbreaks linked to unsafe drinking water, poor waste disposal and mosquito breeding. The most suitable community response would combine
ⓐ. only increased individual exercise and yoga
ⓑ. genetic screening and increased dietary protein alone
ⓒ. safe water, waste disposal and vector control
ⓓ. treatment of symptoms without addressing transmission
Correct Answer: safe water, waste disposal and vector control
Explanation: Community health maintenance includes hygienic food and water resources, proper waste disposal, disease awareness, vaccination and vector control. Because the scenario identifies contaminated water, waste and mosquito breeding as community-level risks, addressing those routes directly provides the most appropriate response.
9. Disease is best recognised as a condition in which
ⓐ. a person has reduced physical fitness even though all body functions remain normal
ⓑ. disturbed normal organ or system function with signs or symptoms
ⓒ. a microorganism must always be present in the body
ⓓ. hereditary changes must occur before symptoms can develop
Correct Answer: disturbed normal organ or system function with signs or symptoms
Explanation: Disease involves an adverse disturbance of the normal functioning of one or more organs or organ systems and is generally associated with recognisable signs and symptoms. Diseases need not always be infectious or hereditary, so neither microorganisms nor genetic alterations are universal requirements.
10. Cancer and common cold differ fundamentally in broad disease classification because
ⓐ. common cold is infectious, but cancer is non-infectious
ⓑ. cancer is infectious whereas common cold is non-infectious
ⓒ. both are infectious but have different routes of transmission
ⓓ. neither condition can involve abnormal organ function
Correct Answer: common cold is infectious, but cancer is non-infectious
Explanation: Common cold is an infectious disease because rhinoviruses can pass from an infected person to another host through respiratory droplets or contaminated objects. Cancer is classified as non-infectious because it does not spread between people through a transmissible pathogen. The distinction therefore depends on transmissibility and causative mechanism, not on how severe the disease is or whether organ function is disturbed.
11. Consider the following pathogen groups:
I. Bacteria
II. Viruses
III. Fungi
IV. Protozoans
V. Helminths
Which statement is biologically correct?
ⓐ. Only I and II can cause human disease
ⓑ. III and V are excluded because pathogens must be microscopic
ⓒ. I, II, III, IV and V can all include disease-causing organisms
ⓓ. Only organisms capable of independent cellular metabolism are pathogens
Correct Answer: I, II, III, IV and V can all include disease-causing organisms
Explanation: Human diseases can be caused by pathogens from several biological groups, including bacteria, viruses, fungi, protozoans and helminths. A pathogen is defined by its ability to cause disease in a host, not by belonging to one taxonomic group, being microscopic, or possessing independent cellular metabolism. Therefore, all five listed groups can contain disease-causing organisms.
12. An organism lives in or on a host and obtains benefit while causing harm to that host. In the context of human disease, this relationship most directly describes
ⓐ. mutualism
ⓑ. independent nutrition
ⓒ. non-infectious degeneration
ⓓ. parasitism
Correct Answer: parasitism
Explanation: A parasite lives in or on another organism and derives benefit while causing harm to the host. Many disease-causing organisms have a parasitic relationship with their hosts. Pathogen and parasite are related concepts in this context but are not simply names for every organism present in the body.
13. An intestinal pathogen enters through contaminated food but must remain viable while passing through an acidic stomach environment before reaching a suitable site for multiplication. This situation best illustrates that successful pathogens require
ⓐ. complete independence from the host environment
ⓑ. elimination of all host digestive secretions before infection
ⓒ. transmission only through insect vectors
ⓓ. adaptation to conditions encountered within the host
Correct Answer: adaptation to conditions encountered within the host
Explanation: For infection to succeed, pathogens must enter the host, survive relevant internal conditions, reach suitable tissues and multiply. Survival through low stomach pH or digestive conditions is an example of host-environment adaptation. Such adaptations help a pathogen complete the steps required to establish disease.
14. After ingestion of contaminated food, Salmonella typhi establishes infection. Which sequence best represents the biological description of its early spread?
ⓐ. Bloodstream → skin → small intestine
ⓑ. Alveoli → bloodstream → large intestine
ⓒ. Small intestine → bloodstream → other organs
ⓓ. Lymphatic vessels → stomach → respiratory passages
Correct Answer: Small intestine → bloodstream → other organs
Explanation: Salmonella typhi is acquired mainly through contaminated food or water. After entering the digestive tract, the bacterium reaches the small intestine and may subsequently migrate through the bloodstream to other organs. The sequence therefore begins with intestinal entry and can progress to systemic spread through blood; routes beginning in alveoli, skin or lymphatic vessels do not match the typhoid infection pathway.
15. A patient has sustained fever around \(39^\circ\text{C}\) to \(40^\circ\text{C}\), weakness, stomach pain, constipation, headache and loss of appetite. If the condition becomes severe, which complication is specifically associated with the suspected disease?
ⓐ. Fluid accumulation in alveoli
ⓑ. Severe intestinal perforation
ⓒ. Chronic lymphatic obstruction
ⓓ. Fungal invasion of nails
Correct Answer: Severe intestinal perforation
Explanation: The symptom combination is characteristic of typhoid. Typhoid may present with sustained high fever, weakness, stomach pain, constipation, headache and loss of appetite. In severe cases, intestinal perforation can occur, making it an important complication of the disease.
16. A food handler appears healthy but repeatedly contributes to transmission of typhoid, and laboratory evaluation of a symptomatic contact includes the associated diagnostic test. Which pairing is correct?
ⓐ. Carrier concept illustrated by Mary Mallon; ELISA used as the diagnostic test
ⓑ. Carrier concept illustrated by Mary Mallon; Widal test used as the diagnostic clue
ⓒ. Mechanical-vector concept illustrated by Mary Mallon; MRI used for diagnosis
ⓓ. Biological-vector concept illustrated by Mary Mallon; biopsy used for diagnosis
Correct Answer: Carrier concept illustrated by Mary Mallon; Widal test used as the diagnostic clue
Explanation: Mary Mallon, commonly referred to as Typhoid Mary, is the example of a carrier who transmitted typhoid through food she prepared. The Widal test is the diagnostic test associated with typhoid. A carrier may transmit an infectious agent even without the typical illness being obvious.
17. A bacterial infection primarily affects the alveoli of the lungs. The causative organisms are
ⓐ. S. typhi and Rhinovirus
ⓑ. E. histolytica and Ascaris
ⓒ. Microsporum and Trichophyton fungi
ⓓ. S. pneumoniae and H. influenzae
Correct Answer: S. pneumoniae and H. influenzae
Explanation: Streptococcus pneumoniae and Haemophilus influenzae are bacterial causes of pneumonia, and the principal affected structures are the alveoli of the lungs. Salmonella typhi is associated with typhoid, Entamoeba histolytica with amoebiasis, Ascaris with ascariasis, and Microsporum and Trichophyton with ringworm. Matching both the pathogen group and target tissue therefore identifies the pneumonia-causing pair.
18. In severe pneumonia, respiratory difficulty develops primarily because
ⓐ. fluid-filled alveoli impair respiratory function
ⓑ. mucus disappears completely from the nasal passage
ⓒ. intestinal walls become perforated
ⓓ. lymphatic vessels of the lower limbs become chronically inflamed
Correct Answer: fluid-filled alveoli impair respiratory function
Explanation: Pneumonia affects the alveoli, which may become filled with fluid. Because alveoli are essential sites for respiratory gas exchange, fluid accumulation interferes with effective respiration. Severe disease may also be associated with gray-to-bluish lips or fingernails, reflecting serious respiratory impairment.
19. Four exposure histories are recorded for a person living with someone who has pneumonia.
I. Prolonged exposure to droplets released during coughing
II. Sharing drinking glasses with the infected person
III. Using utensils contaminated by the infected person's respiratory secretions
IV. Inheriting a gene from the infected person's family
Which combination contains plausible routes of pneumonia transmission?
ⓐ. I and IV only
ⓑ. II and III only
ⓒ. I, II and III
ⓓ. I, II, III and IV
Correct Answer: I, II and III
Explanation: Pneumonia may spread through inhaled droplets or aerosols from an infected person and through shared glasses or utensils. Genetic inheritance from an infected person's family is not a transmission route for this infectious disease. Therefore, the first three exposures are relevant.
20. A patient has nasal congestion, sore throat and cough, but examination does not indicate infection of the lungs. This localisation most strongly favours common cold because rhinoviruses mainly infect
ⓐ. the alveoli and pleural cavity
ⓑ. the small intestine and bloodstream
ⓒ. nose and respiratory passage, not lungs
ⓓ. the lymphatic vessels of the lower limbs
Correct Answer: nose and respiratory passage, not lungs
Explanation: Rhinoviruses causing common cold primarily infect the nose and respiratory passages and generally do not involve the lungs. This localisation explains symptoms such as nasal congestion, sore throat and cough without the alveolar pathology typical of pneumonia. Pneumonia affects lung alveoli and can fill them with fluid, so absence of lung involvement strongly supports common cold in this comparison.
