Question Paper
Class / Subject: Class 9 (ICSE) · Biology
Chapter: Chapter 14 — Chapter 14: The Respiratory System
Time Allowed: 32 minutes
Max Marks: 16
1. Where does air travel first? [1]
(A) Nose or mouth
(B) Directly to lungs
(C) Directly to alveoli
(D) Directly to the heart
2. What connects the trachea to the lungs? [1]
(A) Bronchi
(B) Alveoli directly
(C) The diaphragm
(D) The heart
3. What are alveoli? [1]
(A) Tiny air sacs in the lungs
(B) Large air passages
(C) Blood vessels
(D) Muscles
4. What happens at the alveoli? [1]
(A) Gas exchange occurs
(B) Food is digested
(C) Blood is filtered
(D) Nothing happens
5. What diffuses into the blood at the alveoli? [1]
(A) Oxygen
(B) Carbon dioxide only
(C) Nitrogen only
(D) Nothing diffuses
6. What diffuses out of the blood at the alveoli? [1]
(A) Carbon dioxide
(B) Oxygen only
(C) Nitrogen only
(D) Nothing diffuses
7. What muscle helps us breathe? [1]
(A) The diaphragm
(B) The heart
(C) The stomach
(D) The liver
8. Why study the respiratory system? [1]
(A) To understand how we obtain oxygen for cellular respiration
(B) No reason
(C) It's not useful
(D) Only for tests
9. Where does air travel first? [1]
(A) Nose or mouth
(B) Directly to lungs
(C) Directly to alveoli
(D) Directly to the heart
10. What connects the trachea to the lungs? [1]
(A) Bronchi
(B) Alveoli directly
(C) The diaphragm
(D) The heart
11. What are alveoli? [1]
(A) Tiny air sacs in the lungs
(B) Large air passages
(C) Blood vessels
(D) Muscles
12. What happens at the alveoli? [1]
(A) Gas exchange occurs
(B) Food is digested
(C) Blood is filtered
(D) Nothing happens
13. What diffuses into the blood at the alveoli? [1]
(A) Oxygen
(B) Carbon dioxide only
(C) Nitrogen only
(D) Nothing diffuses
14. What diffuses out of the blood at the alveoli? [1]
(A) Carbon dioxide
(B) Oxygen only
(C) Nitrogen only
(D) Nothing diffuses
15. What muscle helps us breathe? [1]
(A) The diaphragm
(B) The heart
(C) The stomach
(D) The liver
16. Why study the respiratory system? [1]
(A) To understand how we obtain oxygen for cellular respiration
(B) No reason
(C) It's not useful
(D) Only for tests