Breathing Mechanism_Unsolved Paper
Chapter: Life Processes | Topic: Breathing Mechanism
BREATHING MECHANISM_UNSOLVED PAPER
Topic: Breathing Mechanism
Q1. During inhalation, the diaphragm:
- Relaxes and moves upward
- Contracts and moves downward
- Does not move
- Contracts and moves upward
Q2. Which muscles help in expanding the chest cavity during inhalation?
- Cardiac muscles
- Intercostal muscles
- Smooth muscles
- Leg muscles
Q3. The main reason air enters the lungs during inhalation is:
- Increase in body temperature
- Decrease in pressure inside the lungs
- Increase in blood pressure
- Increase in carbon dioxide outside the body
Q4. During exhalation, the volume of the chest cavity:
- Increases
- Remains the same
- Decreases
- Doubles
Q5. A student notices that breathing becomes deeper after climbing several flights of stairs. Which body requirement mainly causes this change?
- Increased need for oxygen
- Increased need for vitamins
- Increased water absorption
- Increased digestion
Q6. Which of the following structures separates the chest cavity from the abdominal cavity?
- Trachea
- Diaphragm
- Bronchus
- Alveolus
Short questions
Q1. Explain the role of the diaphragm during inhalation.
Q2. State any two differences between inhalation and exhalation.
Q3. Why does air move into the lungs during inhalation?
Q4. During a yoga class, students are asked to take slow and deep breaths. Explain how this breathing pattern affects the movement of the diaphragm and chest cavity.
Q5. Describe the role of intercostal muscles in the breathing process.
Q6. Why does breathing rate increase during physical exercise?
Q1. Explain the complete mechanism of breathing in humans. Describe the sequence of events that take place during inhalation and exhalation.
Q2. Compare inhalation and exhalation with respect to:
Movement of diaphragm
Movement of ribs
Volume of chest cavity
Air pressure inside the lungs
Movement of air
Present your answer in a suitable format.
Q3. During the annual sports day, some students recover quickly after a race, while others continue breathing heavily for several minutes. Explain this observation using your knowledge of the breathing mechanism and oxygen requirement.
Q1. Read the following case:
During a science activity, a student inflates a balloon by blowing air into it. The teacher explains that the movement of air into and out of the lungs occurs due to changes in pressure.
Using this example:
Explain how pressure changes help in breathing.
Describe the role of the diaphragm.
Relate the balloon activity to the human breathing mechanism.
Q2.A biology teacher draws the following sequence on the board:
Diaphragm contracts → Chest cavity expands → Pressure changes → Air enters lungs
Explain each stage of this sequence and describe how these events are interconnected during normal breathing.
Q3.Read the following observations:
A person breathes faster after running.
The diaphragm moves differently during inhalation and exhalation.
The rib cage changes position during breathing.
The lungs expand and contract continuously.
Using these observations, explain how the breathing mechanism ensures a continuous supply of oxygen to the body during both rest and physical activity.