Human Respiratory System_Unsolved Paper
Chapter: Life Processes | Topic: Human Respiratory System
HUMAN RESPIRATORY SYSTEM_UNSOLVED PAPER
Topic: Human Respiratory System
Q1. Which organ is the main site of gaseous exchange in the human respiratory system?
- Trachea
- Bronchi
- Alveoli
- Larynx
Q2.The windpipe is also known as the:
- Bronchus
- Oesophagus
- Trachea
- Pharynx
Q3. Which muscle plays the most important role during breathing?
- Biceps
- Diaphragm
- Triceps
- Deltoid
Q4. During inhalation, the diaphragm:
- Relaxes and moves upward
- Contracts and moves downward
- Does not move
- Expands sideways only
Q5. A student notices that breathing becomes faster after climbing stairs. Which process mainly
- Digestion
- Photosynthesis
- Respiration
- Excretion
Q6. Which gas is transported from the lungs to the body cells through the blood?
- Carbon dioxide
- Nitrogen
- Oxygen
- Water vapour
Short questions
Q1. List the path followed by air from the nostrils to the alveoli.
Q2. State any two functions of the nasal cavity in the process of breathing.
Q3. Explain why alveoli are well suited for the exchange of gases.
Q4. During a morning assembly, a student starts breathing rapidly after running to school. Explain why the breathing rate increases in this situation.
Q5. Differentiate between inhalation and exhalation based on the movement of the diaphragm and ribs.
Q6. Describe the role of haemoglobin in the transport of respiratory gases.
Q1. Describe the structure of the human respiratory system. Explain the functions of the major organs involved in the movement of air from the nostrils to the lungs.
Q2. Explain the mechanism of breathing in humans. Describe the events that occur during inhalation and exhalation.
Q3. During a school sports competition, two students complete a 400-metre race. One student recovers quickly, while the other continues breathing heavily for several minutes. Explain this observation using your understanding of the human respiratory system and oxygen demand.
Q1. Read the following case:
Riya lives in a busy city where traffic pollution is high. Her teacher advises students to avoid outdoor exercise during peak traffic hours.
Based on your understanding of the respiratory system:
Explain how polluted air enters the respiratory tract.
Identify the organs that help filter the air.
Discuss how clean air supports efficient respiration.
Q2. A biology teacher prepared the following flow chart:
Nostrils → Nasal Cavity → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli
Using this flow chart, explain the movement of air through each part of the respiratory system and describe the function of each structure.
Q3. During a health awareness camp, students observed the following:
A healthy person breathes comfortably during normal activities.
Breathing becomes faster during exercise.
Gas exchange occurs in tiny air sacs inside the lungs.
Oxygen is transported to body cells through blood.
Using these observations, explain how different parts of the human respiratory system work together to maintain a continuous supply of oxygen to the body.