Practise 18 real Federal Board questions on Gaseous Exchange from 2023 to 2026. See the answer and explanation as soon as you answer.
Gaseous Exchange is one of the 15 main chapters in our Federal Board Matric Biology question bank (10th class), and about 5% of its real questions come from it. Tayyari Karo has 18 real questions on this chapter from 2023 to 2026; 5 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 9 easy, 9 medium.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
The nasal cavity helps in breathing mainly by:
Answer: D. Filtering and warming air
The nasal cavity filters, warms and moistens incoming air before it reaches the lungs.
The part of respiratory system where gaseous exchange occurs is:
Answer: D. Alveoli
Gaseous exchange occurs across the thin walls of the alveoli, the tiny air sacs of the lungs.
Which of the following is the correct sequence of structures in the human respiratory tract?
Answer: C. Larynx → Trachea → Bronchi → Alveoli
Inhaled air passes larynx → trachea → bronchi → bronchioles → alveoli, matching option C's order.
Which blood vessel surrounds the alveoli?
Answer: A. Capillary
A dense network of capillaries surrounds each alveolus, allowing efficient gas exchange with the blood.
Which of these is the correct order of structures involved in the flow of oxygen in the human body?
Answer: B. Pharynx → larynx → trachea → bronchi → bronchioles
Inhaled air passes: pharynx → larynx → trachea → bronchi → bronchioles → alveoli.
What is bronchitis? Mention one cause and one symptom of it.
Bronchitis is the inflammation of the lining of the bronchi (airways carrying air to the lungs).
Cause: smoking (or exposure to air pollution/irritants) is a major cause.
Symptom: persistent cough, often producing mucus/phlegm.
Differentiate 'respiration' from 'breathing'.
Respiration is the biochemical, cellular process of breaking down glucose to release energy (ATP), occurring inside cells (in mitochondria for aerobic respiration).
Breathing is the physical, mechanical process of inhaling and exhaling air into and out of the lungs, which simply supplies the oxygen needed for respiration and removes CO₂ produced by it — breathing is a visible physical act, respiration is an internal chemical process.
What are the effects of smoking on circulatory system and lungs? Explain.
Effects on circulatory system: nicotine in cigarette smoke raises heart rate and blood pressure and constricts blood vessels; carbon monoxide binds to haemoglobin (forming carboxyhaemoglobin) more readily than oxygen, reducing the blood's oxygen-carrying capacity; smoking also promotes fatty deposits (plaques) on artery walls (atherosclerosis), greatly increasing the risk of heart attack, stroke and hypertension.
Effects on lungs: tar and chemicals in smoke damage and paralyse the cilia lining the airways, reducing their ability to clear mucus and trapped particles, leading to persistent coughing (smoker's cough) and infections such as chronic bronchitis. …
The full model answer is in the app.
| Session | Questions |
|---|---|
| 2026 Annual | 4 |
| 2025 1st Annual | 3 |
| 2025 2nd Annual | 4 |
| 2024 Annual | 3 |
| 2023 Annual | 4 |
18 real Federal Board (FBISE) Biology questions on Gaseous Exchange from 2023 to 2026, for 10th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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