Modes of Transmission - UNSOLVED PRACTICE SET
Chapter: Why Do We Fall Ill | Topic: Modes of Transmission
MODES OF TRANSMISSION - UNSOLVED PRACTICE SET
Topic: Modes of Transmission
Multiple Choice Questions
Q1. Diseases that spread through tiny droplets when an infected person coughs or sneezes are called:
- Water-borne diseases
- Air-borne diseases
- Vector-borne diseases
- Genetic diseases
Q2. Which of the following diseases spreads through contaminated water?
- Tuberculosis
- Cholera
- Malaria
- Common cold
Q3. A mosquito that carries the malaria parasite from an infected person to a healthy person is called:
- A host
- A pathogen
- A vector
- A parasite
Q4. AIDS can spread through:
- Shaking hands with an infected person in class
- Sharing a tiffin box with an infected friend
- Blood transfusion from an infected person
- Playing cricket together
Q5. During the COVID-19 pandemic, wearing masks and maintaining distance were advised mainly to prevent:
- Water-borne transmission
- Air-borne transmission through droplets
- Vector-borne transmission
- Genetic transmission
Short Answer Questions
Q6. Name the four main modes of transmission of infectious diseases. Give one example of a disease for each mode.
Q7. Explain the difference between direct contact and indirect contact transmission. Give one real-life example of each from school or home.
Q8. What are vectors? Name two disease vectors common in India and the diseases they transmit.
Q9. Why do diseases like cholera spread rapidly during floods and heavy monsoons in cities like Mumbai or Chennai? Explain with reference to the mode of transmission.
Long Answer Questions
Q10. Describe the various modes of transmission of infectious diseases with examples from Indian context: through air, through water and food, through direct contact, through vectors, and from mother to child. Why is breaking the chain of transmission the most effective strategy in controlling epidemics like dengue or swine flu?
Q11. "Vectors are not the real criminals, but they are dangerous delivery agents." Explain this statement by discussing the role of mosquitoes in malaria and dengue transmission, why killing mosquitoes is an effective control measure, and what practical vector control methods are used in Indian cities and villages.
APPLICATION / ANALYSIS
Q12. Case Study - Monsoon Outbreak in a Village:
During monsoon in a Bihar village, the health worker recorded:
| Disease | Number of Cases | Season |
|---|---|---|
| Cholera | 35 | Monsoon |
| Malaria | 28 | Monsoon |
| Viral fever | 20 | Monsoon |
| Typhoid | 15 | Monsoon |
| Worm infestation | 40 | Throughout the year |
Answer the following:
(a) Identify the mode of transmission for each disease.
(b) Why did water-borne and vector-borne diseases increase specifically during monsoon? Explain the environmental factors.
(c) Design a simple monsoon health action plan for this village with two practical measures.
Q13. Real-Life Application — School Trip to a Hill Station:
During a Class 9 trip to Manali:
Group A (5 students): Drank water from a mountain stream → all got diarrhoea
Group B (3 students): Were bitten by mosquitoes near a stagnant pond → got fever
Group C (2 students): Shared a water bottle with a friend who had a cold → later caught cold
Answer the following:
(a) Identify the mode of transmission for each group.
(b) Which transmission could have been most easily prevented with simple precautions? What should the students have done?
(c) Write two safety rules that should be mandatory for all future school trips, based on this experience.