Biology

Respiration and Gas Exchange

958 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

Breathing involves the movement of the

  1. Nose and rib cage

  2. Lungs and rib cage

  3. Diaphragm and lungs

  4. Diaphragm and rib cage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During inhalation, ribs move up and outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position.

Multiple choice

The taking in of air rich in oxygen into the body is called

  1. Exhalation

  2. Inhalation

  3. Respiration

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

Exhalation is giving out of air rich in carbon dioxide. Respiration is breakdown of food material to release energy and photosynthesis is the process of manufacturing food by the plants by using raw materials.

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.