Breathing and Exchange of Gases Practice Questions
NEET · Biology · 1021 free MCQs with instant results and detailed explanations.
1021
Total
199
Easy
459
Medium
363
Hard
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Topics in Breathing and Exchange of Gases
Respiratory Disorders
259
Respiratory Organs
255
Mechanism of Breathing
260
Exchange and Transport of Gases
247
Sample Questions from Breathing and Exchange of Gases
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which structure in the respiratory system is primarily responsible for gas exchange?
A.
Bronchioles
B.
Alveoli
C.
Trachea
D.
Larynx
Show Answer & Explanation
Correct Answer: B
The alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs, making them the primary site for gas exchange.
Q2
Easy
What is the main function of the diaphragm in the respiratory process?
A.
To filter air
B.
To transport oxygen
C.
To facilitate inhalation and exhalation
D.
To produce sound
Show Answer & Explanation
Correct Answer: C
The diaphragm is a muscle that contracts and relaxes to change the volume of the thoracic cavity, facilitating inhalation and exhalation.
Q3
Easy
In humans, which of the following is the primary organ for respiration?
A.
Heart
B.
Lungs
C.
Liver
D.
Kidneys
Show Answer & Explanation
Correct Answer: B
The lungs are the primary organs of respiration, where oxygen is taken in and carbon dioxide is expelled.
Q4
Medium
What is the primary function of the alveoli in the human respiratory system?
A.
To filter and warm the air
B.
To facilitate gas exchange
C.
To produce surfactant
D.
To transport carbon dioxide
Show Answer & Explanation
Correct Answer: B
The primary function of alveoli is to facilitate gas exchange between the air and the bloodstream, allowing oxygen to enter the blood and carbon dioxide to be expelled.
Q5
Medium
During inhalation, which of the following muscles contracts to increase the thoracic cavity volume?
A.
Abdominal muscles
B.
Intercostal muscles
C.
Diaphragm
D.
Pectoral muscles
Show Answer & Explanation
Correct Answer: C
The diaphragm contracts during inhalation, increasing the volume of the thoracic cavity and allowing air to flow into the lungs.
Q6
Medium
In which part of the human respiratory system does the exchange of gases primarily take place?
A.
Bronchi
B.
Trachea
C.
Alveoli
D.
Larynx
Show Answer & Explanation
Correct Answer: C
Gas exchange primarily takes place in the alveoli, where oxygen and carbon dioxide are exchanged between the air and blood.
Q7
Medium
What role does surfactant play in the alveoli?
A.
Helps in gas exchange
B.
Prevents alveolar collapse
C.
Increases lung volume
D.
Enhances oxygen transport
Show Answer & Explanation
Correct Answer: B
Surfactant reduces surface tension in the alveoli, preventing their collapse and ensuring they remain open for efficient gas exchange.
Q8
Hard
Which of the following structures in the human respiratory system is primarily responsible for gas exchange?
A.
Alveoli
B.
Bronchi
C.
Trachea
D.
Larynx
Show Answer & Explanation
Correct Answer: A
Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs. They provide a large surface area for this process, making them essential for respiration.
Q9
Hard
A patient with a respiratory disease is unable to effectively exchange gases in their lungs. Which part of the respiratory system might be primarily affected?
A.
Pleura
B.
Bronchioles
C.
Nasal cavity
D.
Diaphragm
Show Answer & Explanation
Correct Answer: B
Bronchioles are the smaller branches of the bronchi leading to the alveoli, where gas exchange occurs. If bronchioles are obstructed or damaged, gas exchange efficiency decreases significantly.
Q10
Hard
In the context of breathing, what role does the diaphragm play in the mechanics of respiration?
A.
It prevents air from entering the lungs.
B.
It separates the thoracic cavity from the abdominal cavity.
C.
It contracts to create a negative pressure for inhalation.
D.
It regulates the exchange of gases in the alveoli.
Show Answer & Explanation
Correct Answer: C
The diaphragm is a muscular structure that contracts during inhalation, which increases the thoracic cavity volume and creates a negative pressure, allowing air to rush into the lungs.
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Breathing and Exchange of Gases — NEET Biology Practice Questions Online
This page contains 1021 practice MCQs for the chapter Breathing and Exchange of Gases in NEET Biology. The questions are organized by difficulty — 199 easy, 459 medium, 363 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.