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

In the lungs, gaseous exchange takes place in

  1. the alveoli

  2. the bronchioles

  3. the bronchi

  4. the trachea

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

The alveoli are tiny air pockets at the ends of the bronchioles. Oxygen from the air diffuses into the blood capillaries in their walls and carbon dioxide diffuses out.

Multiple choice

In __________ disease, the mucous membranes of the bronchi are affected.

  1. legionellosis

  2. peptic ulcer

  3. bronchitis

  4. pneumonia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bronchitis is inflammation of the mucous membranes of the bronchi, the airways that carry airflow from the trachea into the lungs. Bronchitis can be divided into two categories, acute and chronic, each of which has unique etiologies, pathologies, and therapies.

Multiple choice

Anus is the hole in the body to

  1. respire

  2. Release wastes

  3. Sweat

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

The anus is the opening at the end of the digestive tract through which solid waste is eliminated from the body.

Multiple choice

The opposite of ‘mature’ is

Directions: Read the following passage and answer the question that follows.

Around 35 percent of school-going children in India suffer from poor lung health with Delhi topping the chart, reveals a recently released survey report.
According to nation-wide survey report, a worrisome 21 percent of the children surveyed in Delhi have been tagged with 'poor' lung capacity in the Lung Health Screening Test (LHST) conducted on them while another 19 percent faring as 'bad'.
Together this segment forms a whopping 40 percent of the children surveyed.
The survey included 2000 school students in the age group of 8-14 from all parts of the county.
"The Lung Health Screening Test determines how much air the lungs can hold, how quickly one can move air in and out of their lungs, and how well the lungs take oxygen in and remove carbon dioxide out from the body. The tests can detect lung diseases and measure the severity of lung problems. Poor results on LHST mean compromised lung function and high possibilities of contracting pulmonary diseases," Dr Preetaish Kaul, representative of HEAL Foundation said.
"While rising air pollution in the country poses serious health risks for all, it is more worrisome for children as they are yet in their growth years with vital organs of the body physiologically not mature enough to deal with it," Dr Raj Kumar, HOD Department of Respiratory allergy said.

  1. complete

  2. ripe

  3. seasoned

  4. young
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

'Mature' means 'grown up or adult'.

'Young' means 'being in an early period of life, development, or growth'. 

Multiple choice

The roots modified for breathing are

  1. propagative roots

  2. haustorial roots

  3. pneumatophores

  4. stranglers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

These specialized aerial roots enable plants to breathe air in habitats that have waterlogged soil. The roots may grow down from the stem, or up from typical roots.

Multiple choice

Respiratory quotient in succulents is

  1. one

  2. more than one

  3. less than one

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

 Respiratory quotient in succulents is more than one as organic acids form the respiratory substrate.

Multiple choice

What will happen if a child breathes with mouth and not with nose?

  1. He will breathe in more oxygen.

  2. Harmful dust particles will also enter.

  3. Saliva will not let harmful particles enter.

  4. Teeth will not let enough oxygen enter.

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, harmful dust particles may enter his body. Fine hair and mucus are present inside the nose to prevent dust particles from getting into the respiratory system.

Multiple choice

Which part of the body is affected by asthma?

  1. Lungs

  2. Respiratory tract

  3. Heart

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

Asthma primarily affects the respiratory tract, causing bronchial tube inflammation, constriction, and mucus production that makes breathing difficult. While lungs contain the affected airways, 'respiratory tract' more precisely describes the system impacted. Asthma doesn't directly affect heart or liver function.

Multiple choice

Breathing into a paper bag can cure

  1. hypoxia

  2. hyperventilation

  3. Both 1 and 2

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Breathing into a paper bag helps treat hyperventilation by re-inhaling carbon dioxide. Hyperventilation causes excessive CO2 expulsion, leading to respiratory alkalosis. The paper bag technique increases CO2 levels in the bloodstream, restoring acid-base balance. It does not treat hypoxia, which requires oxygen supplementation.

Multiple choice

A gill is a respiratory organ found in many aquatic organisms which helps in breathing. Which among the following is the only fungus having true gills?

  1. Aspergillus lentulus

  2. Aspergillus clavatus

  3. Batrachochytrium dendrobatidis

  4. Phruensis

  5. Psathyrella aquatica
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Psathyrella aquatica with true gills has been observed fruiting underwater in the clear, cold, flowing water. Fruiting bodies develop and mature in the main channel, where they are constantly submerged, and were observed fruiting over 11 wk. These mushrooms develop underwater, not on wood recently washed into the river.

Multiple choice

Why should we breathe from our nose and not from our mouth?

  1. Becaus fFine hair and mucus present inside the nose prevent dust particles from getting into the respiratory system.

  2. Becaus we loose more water during expiration when we use our nose for breathing.

  3. Because our nose purifies the oxygen and the mouth does not purify oxygen.

  4. Because we can breathe more from our nose because of the shorter pathway of air and larger diameter as compared to the mouth.

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

This is the correct option. Fine hair and muscus do not allow the harmful dust particles from getting inside our respiratory system.

Multiple choice

Which of the following is/are the usage(s) of air?

  1. Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.

  2. Birds, bats and insects can fly due to the presence of air.

  3. Air is used by humans and other living beings for respiration.

  4. Air plays an important role in water cycle.

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as all the above mentioned options are the usages of air.