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 zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

Choose the correct answer from the alternatives given.
What are the tiny clusters of chambers for diffusion of gases in lungs?

  1. Pleura

  2. Alveolar sacs

  3. Bronchioles

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

The pleura are membranes that secrete a lubricating fluid, which allows free movement of the lungs against the chest wall while breathing. The alveolar sacs are sacs of many alveoli (clusters of chambers), that help exchange oxygen and carbon dioxide in the lungs. The bronchioles are the passageways by which air passes through the nose or mouth to the alveoli (air sacs) of the lungs. Each lobe of the lung has the same physiologic function, bringing oxygen into the bloodstream and removing carbon dioxide. So, the correct option is 'alveolar sacs'.

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

Membrane separating air in pulmonary alveoli from blood capillaries.

  1. Alveolar epithelium

  2. Cardiac epithelium

  3. Endothelium of blood capillaries
  4. Both $'1'$ and $'3'$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Here option (D) is the correct answer as-
Outermost Layer Of pulmonary alveolitis alveolar epithelium while that of blood capillaries is endothelium. Thus, both alveolar epithelium and endothelium of blood capillaries separate air in pulmonary alveoli from blood capillaries.
Multiple choice zoology respiration in living organisms respiration in human beings respiration and associated structures respiration in humans

 A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called

  1. inspiratory reserve volume

  2. tidal volume

  3. expiratory reserve volume

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

The volume of air inspired or expired during normal breath is called tidal volume. It is about 500 mL of air in average young adult man.

Multiple choice chemistry water and air and their importance importance of oxygen is air present everywhere around us? air as a natural resource

Plants also consumes ________ for respiration.

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants also consume oxygen for respiration.


At night, when photosynthesis can’t take place, plants continue to consume oxygen but they don’t release any back into the atmosphere.


As the amount of oxygen consumes by the plants is very low during respiration so it doesn't effect the oxygen levels of the atmosphere.


Hence the correct option is B.

Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

Which one of the following is not a function of air?

  1. Combustion

  2. To fill the balloons and air strip

  3. Respiration

  4. Pollination of plants
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Air is a mixture of different types of gases, dust particles, water vapours, etc.
The important components of air are nitrogen, oxygen, argon, carbon dioxide, etc,
Air is a very important component of the earth because of the following reasons
  1. It provides us fresh oxygen for respiration process
  2. It supports the water cycle
  3. It facilitates pollination in plants
  4. Conduct sound and help in the transmission
  5. It helps in the combustion process.
Multiple choice common respiratory diseases respiratory disorders respiratory system respiratory system of human biology

Which of the following two diseases together are referred to as chronic obstructive lung disease (COLD) or chronic obstructive airways disease?

  1. Acute bronchitis and chronic bronchitis

  2. Chronic bronchitis and emphysema

  3. Tuberculosis and emphysema

  4. Tuberculosis and chronic bronchitis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  1. Chronic bronchitis is a disease caused by the inflammation of bronchitis which secretes mucous leads to coughing and breathing difficulty and commonly observed in smokers.
  2. Emphysema is a disease in which alveolar sacs get damage which results in the deficiency in the amount of oxygen required by the body and its common cause is also smoking.
When these two diseases found together in a patient it is referred to as chronic obstructive lung disease (COLD) or chronic obstructive airways disease.
So the correct option is 'Chronic bronchitis and emphysema'.

Multiple choice common respiratory diseases respiratory disorders respiratory system respiratory system of human biology

Inflammation of the lung covering causing severe chest pain is

  1. Emphysema

  2. Pleurisy

  3. Asphyxia

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

Pleurisy involves inflammation of the tissue layers (pleura) lining the lungs and inner chest wall. Pleurisy is often associated with the accumulation of fluid between the two layers of pleura, known as pleural effusion. Symptoms of pleurisy include pain in the chest, which is aggravated by breathing in, shortness of breath, and local tenderness. The diagnosis of pleurisy is made by the characteristic chest pain and physical findings on examination of the chest. The pleural accumulation of fluid (pleural effusion) can be seen by imaging studies.

Multiple choice common respiratory diseases respiratory disorders respiratory system respiratory system of human biology

Inflammatory condition of lungs is called

  1. coryza

  2. pneumonia

  3. laryngitis

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

Coryza is an inflammatory condition of the mucous membrane of the nose. Inflammatory condition of lungs is called pneumonia. Laryngitis is an inflammatory condition of larynx. Nasopharyngitis is the inflammatory condition of nose and pharynx.

Thus, the correct answer is option B.

Multiple choice common respiratory diseases respiratory disorders respiratory system respiratory system of human biology

How many statements are wrong about asthma?

(i) The respiratory surface is decreased.
(ii) The only cause of it is cigarette smoking.
(iii) Due to inflammation of bronchi and bronchioles.
(iv) Alveolar walls are damaged altogether.
(v) Difficulty in breathing causes wheezing.

  1. One

  2. Two

  3. Three

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

In asthma:

(i) Respiratory surface is decreased.

(ii) Cigarette smoking is one of its causes. It can occur due to air pollution, dust allergies etc.

(iii) The symptoms of asthma begin with the inflammation of bronchi and bronchioles.

(iv) Alveolar walls are damaged in asthma

(v) Asthma results in difficulty in breathing, causing wheezing. Hence, only one statement is wrong. So, the correct answer is 'The only cause of it, is cigarette smoking'.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Respiratory rate in new born baby is

  1. Equal to an adult

  2. Less than an adult

  3. More than an adult

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

Babies and children normally breathe faster than older children and adults. Newborn to 6 months: 30-60 breaths/min

6 to 12 months: 24-30 breaths/min
1 to 5 years: 20-30 breaths/min
6 to 12 years: 12-20 breaths/min

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

During respiration, there is 

  1. A gain in dry weight

  2. A loss in dry weight

  3. No change in weight

  4. All of the above depending on the type of respirable material
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Respiration is a process based on chemical reaction and takes place  in all living cells. In this process, energy is released from glucose, for the functioning of our cells. Sugars used as a substrate for respiration comes from the hydrolysis of starch which results in loss of dry matter. 

Therefore, the correct answer is option B.