Biology

Respiration and Gas Exchange

989 Questions

Access a targeted set of questions on respiration and gas exchange for competitive exams. Topics include lung volumes, the mechanism of breathing, and respiratory anatomy. Understanding these physiological processes is essential for scoring well.

Lung volumes and capacitiesBreathing mechanismsRespiratory anatomyGas exchange processes

Respiration and Gas Exchange Questions

Multiple choice

Which of the following are the respiratory organs in aquatic whales?

  1. Gills

  2. Lungs

  3. Skin

  4. Tracheae
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Whales are mammals and breathe through lungs, not gills. They must surface to breathe air through blowholes. While they are aquatic, they retain mammalian respiratory systems. Gills are for fish, skin respiration is for some amphibians, and tracheae are for insects. This question tests understanding of evolutionary adaptations in aquatic mammals.

Multiple choice

How is respiration accomplished in arthropods?

  1. By lungs and gills

  2. By book lungs and tracheae

  3. By lungs and tracheae

  4. By book lungs, tracheae and gills
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Arthropods use multiple respiratory structures depending on their habitat and size. Aquatic arthropods (like crabs) use gills. Terrestrial arachnids (scorpions, spiders) use book lungs. Insects use tracheae (tubular respiratory system). No single option covers all arthropods - only option D correctly includes all three respiratory structures found across the phylum.

Multiple choice

Which of the following statements is/are false?

a. When the pressure within the lungs is less than the atmospheric pressure, inspiration occurs. b. Both the lungs are covered by triple layer of pleura, having pleural fluid between them. c. Respiratory rhythm centre is responsible for maintaining and moderating the respiratory rhythm in humans.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. Both the lungs are covered by double layer of pleura, having pleural fluid between them.

Multiple choice

The conducting part of the respiratory system is the part starting with the external nostrils up to the terminal bronchioles. Which of the following is not a function of the conducting part?

  1. It brings the air to body temperature.

  2. It is the site of actual diffusion of oxygen and carbon dioxide between the alveoli and a network of tiny blood vessels called capillaries.

  3. It humidifies the atmospheric air.

  4. It clears the atmospheric air.

  5. It transports the atmospheric air to the alveoli.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as this is not a function of the conducting part. Alveoli and their ducts form the exchange part of the respiratory system.

Multiple choice

Which of the following statements is/are false?

a. The expansion of diaphragm decreases the volume of thoracic chamber in the antero-posterior axis. b. On an average, 1100 mL to 1200 mL volume of air remains in the lungs even after a forcible expiration. c. Humans can increase the strength of breathing with the help of additional muscles in the abdomen.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. The contraction of diaphragm increases the volume of thoracic chamber in the antero-posterior axis.

Multiple choice

Which of the following can alter the respiratory mechanism?

a. The pneumotaxic centre in the pons region of the brain b. The chemosensitive area in the medulla c. The respiratory centre in the medulla

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. The pneumotaxic centre in the pons region of the brain and the chemosensitive area in the medulla can alter the respiratory mechanism. 

Multiple choice

Which of the following statements is/are false?

a. The device that can be used to estimate the volume of air involved in breathing movements is called barometer. b. Expiration occurs if the intra-pulmonary pressure is higher than the atmospheric pressure. c. The additional volume of air that a person can inspire by a forcible inspiration is called the inspiratory reserve volume.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. The device that can be used to estimate the volume of air involved in breathing movements is called spirometer. 

Multiple choice

Match the following:

 
a. Tidal volume 1. It is the additional volume of air that a person can expire by a forcible expiration.
b. Expiratory reserve volume 2. It is the volume of air expired or inspired during a normal respiration.
c. Residual volume 3. It is the volume of air remaining in the lungs even after forcible expiration.

  1. a - 2, b - 1, c - 3

  2. a - 2, b - 3, c - 1

  3. a - 3, b - 2, c - 1

  4. a - 1, b - 2, c - 3

  5. a - 3, b - 1, c - 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Tidal volume is the volume of air expired or inspired during a normal respiration. Expiratory reserve volume is the additional volume of air that a person can expire by a forcible expiration. Residual volume is the volume of air remaining in the lungs even after forcible expiration.