Why Do We Fall Ill Class 9 MCQs with Answers & Explanations
Why Do We Fall Ill Class 9 MCQs with Answers & Explanations
Class: 9
Subject: Science
Section: Biology
Topic: Why Do We Fall Ill
Board: CBSE (NCERT Based)
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 9 Science examination standard.
Subject: Science
Section: Biology
Topic: Why Do We Fall Ill
Board: CBSE (NCERT Based)
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 9 Science examination standard.
1. Health is defined as a state of:
Answer: C
Explanation: WHO defines health as complete physical, mental, and social well-being, not merely absence of disease.
Explanation: WHO defines health as complete physical, mental, and social well-being, not merely absence of disease.
2. A disease lasting for a short period is:
Answer: B
Explanation: Acute diseases like cold or flu last for a short duration.
Explanation: Acute diseases like cold or flu last for a short duration.
3. Tuberculosis is a:
Answer: B
Explanation: TB persists for long periods, hence chronic.
Explanation: TB persists for long periods, hence chronic.
4. Immediate cause of disease is:
Answer: B
Explanation: Microorganisms directly cause infectious diseases.
Explanation: Microorganisms directly cause infectious diseases.
5. Malaria is caused by:
Answer: C
Explanation: Caused by Plasmodium protozoa transmitted by female Anopheles mosquito.
Explanation: Caused by Plasmodium protozoa transmitted by female Anopheles mosquito.
6. AIDS is caused by:
Answer: B
Explanation: HIV virus attacks the immune system.
Explanation: HIV virus attacks the immune system.
7. Non-communicable diseases include:
Answer: B
Explanation: Diabetes does not spread person to person.
Explanation: Diabetes does not spread person to person.
8. Deficiency of Vitamin C causes:
Answer: B
Explanation: Leads to bleeding gums and weak immunity.
Explanation: Leads to bleeding gums and weak immunity.
9. Disease spread through water:
Answer: B
Explanation: Caused by contaminated water.
Explanation: Caused by contaminated water.
10. Vector for dengue:
Answer: B
Explanation: Aedes aegypti spreads dengue virus.
Explanation: Aedes aegypti spreads dengue virus.
11. Antibiotics work against:
Answer: B — They kill or inhibit bacteria.
12. Vaccination provides:
Answer: B — Stimulates immune memory.
13. Carrier of typhoid:
Answer: B
14. Organism causing cholera:
Answer: B — Vibrio cholerae.
15. Genetic diseases are caused by:
Answer: B
16. Air-borne disease:
Answer: A
17. Goitre is due to lack of:
Answer: B
18. Pathogens enter through:
Answer: D
19. Public hygiene helps in:
Answer: B
20. Balanced diet helps:
Answer: B — Strong immune defense.