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

Gills are well supplied with _________ for exchange of gases.

  1. Blood vessels

  2. Mucus gland

  3. Air sacs

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

gills in fish help them to use oxygen dissolved in water. Gills are projectionsof the skin. You may wonder how gills help in breathing. Gills are well suppliedwith blood vessels for exchange of gases.

Multiple choice

Sea animals, like dolphins and whales breathe in air through .

  1. nostrils

  2. lungs

  3. skin

  4. gills
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dolphins and Whales are the animals which neither have gills nor lungs to take in the air and to breathe for these animals come at the surface of water, absorb the oxygen from air through their nostrils and remain in water for longer by utilising this oxygen gradually.

Multiple choice

Which system is involved in the inhale and exhale of air?

  1. Digestive system

  2. Respiratory system

  3. Circulatory system

  4. Excretory system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
System Function
Digestive system
Taking in complex food and its breakdown into simpler forms which is then used up by the body.
Respiratory system
Inhaling and exhaling air and utilizing it to meet energy needs
Circulatory system
Movement of blood to each and every part of body to provide nutrition
Excretory system
Removal of water materials from the body

So it is the respiratory system involved in the inhalation and exhalation of air.

Multiple choice

Hiccups are due to the activity of

  1. intercostal muscles

  2. food in air tract

  3. diaphragm

  4. inadequate oxygen in atmosphere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hiccups are due to the involuntary contraction of the diaphragm. Hiccups may occur individually, or they may occur in bouts. The rhythm of the hiccups, or the time between hiccups, tends to be relatively constant. 

Multiple choice

Passive smoking is breathing in smoke from other people's cigarettes, cigars or pipes. Smoke that is breathed out by a smoker is called mainstream smoke. Which of the following is not passive smoking?

  1. A pregnant woman sitting in a room where her husband is smoking.

  2. A group of friends smoking by turns from a common cigarette.

  3. A woman standing in a market-place and inhaling smoke.

  4. A child standing with his grandfather who is smoking.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In this case all the people are smoking directly or actively.

Multiple choice

Contractions of the external intercostal muscles bring about

  1. decrease in the volume of thoracic cavity

  2. increase in the volume of thoracic cavity

  3. flattening of the diaphragm

  4. no change in the <font size="2">v</font>olume of thoracic cavity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Contractions of the external intercostal muscles bring about increase in the volume of thoracic cavity.

Multiple choice

Why do mammalian lungs have numerous alveoli?

  1. For increasing volume of inspired air

  2. For keeping the lungs in proper shape and position

  3. For higher number of muscles to provide greater elasticity

  4. For increasing the surface area for gaseous diffusio<font size="2">n</font>

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mammalian lungs have numerous alveoli for increasing the surface area for gaseous diffusion.

Multiple choice

Respiration in frog is performed with the help of

  1. buccal cavity

  2. skin

  3. lungs

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The frog has three respiratory surfaces on its body that it uses to exchange gas with the surroundings: the skin, in the lungs and on the lining of the mouth.