ICSE Class 6 Biology - Respiratory System - Test 5 (Comprehensive)
1. Smoking mainly affects the respiratory system by:
A. Damaging lungs
B. Improving oxygen supply
C. Increasing digestion speed
2. Asthma mainly causes:
A. Faster digestion
B. Breathing difficulty
C. Bone weakness
3. Hiccups are caused by:
A. Heart failure
B. Lung infection only
C. Diaphragm contraction
4. Yawning is usually caused by:
A. Low oxygen level
B. High digestion rate
C. Excess water in body
5. During exercise, breathing becomes faster because:
A. Less energy is needed
B. More oxygen is required
C. Digestion stops
6. At high altitudes, breathing becomes difficult due to:
A. More food intake
B. High temperature only
C. Low oxygen level
7. The voice box is called:
A. Larynx
B. Bronchus
C. Alveoli
8. Sneezing helps in:
A. Digestion
B. Cleaning air passages
C. Blood circulation
9. Nasal hair helps to:
A. Produce oxygen
B. Increase breathing speed
C. Trap dust particles
10. Respiration helps in releasing:
A. Energy
B. Water only
C. Carbon dioxide only
11. Breathing is different from respiration because:
A. Both are same processes
B. Respiration happens inside cells
C. Breathing produces food
12. Clean air is important for:
A. Digestion only
B. Bone growth only
C. Healthy breathing
13. Lung capacity means:
A. Amount of air lungs can hold
B. Size of heart
C. Food intake level
14. Cells need oxygen to:
A. Store water
B. Release energy
C. Form bones
15. Air pollution mainly affects:
A. Digestion
B. Circulation
C. Respiration
16. Carbon monoxide is dangerous because it:
A. Blocks oxygen supply
B. Helps digestion
C. Increases breathing speed safely
17. Breathing during sleep is:
A. Stopped completely
B. Continuous
C. Not needed
18. Regular exercise helps the respiratory system by:
A. Reducing digestion
B. Stopping breathing
C. Improving lung efficiency
19. The respiratory system works as:
A. A coordinated system
B. A single organ only
C. A bone system
20. The main importance of respiration is:
A. Food storage
B. Energy production
C. Bone formation