Breathing and Exchange of Gases Biology Quiz for NEET

No. of Questions in Quiz	25 with Explanation
Time for each Questions	60 Seconds
Attempts Allowed	Unlimited
Available	Always
Pass Percentage	70 %

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#1. Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

Inflammation of bronchioles; Decreased respiratory surface

Increased number of bronchioles; Increased respiratory surface

Decreased respiratory surface; Inflammation of bronchioles

Increased respiratory surface; Inflammation of bronchioles

#2. Which of the following is an occupational respiratory disorder?

Anthracis

Silicosis

Emphysema

Botulism

Silicosis is due to excess inhalation of silica dust in the workers involved grinding or stone breaking industries.

#3. Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of

Residual Volume

Inspiratory Reserve Volume

Tidal Volume

Expiratory Reserve Volume

#4. The partial pressure of oxygen in the alveoli of the lungs is

Equal to that in the blood

More than that in the blood

Less than that in the blood

Less than that of carbon dioxide

Partial pressure of oxygen in alveoli of lungs is 104 mm of Hg that is more than that of blood in pulmonary artery (40 mm of Hg).

#5. Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

There is a negative pressure in the lungs

There is a negative intrapleural pressure pulling at the lung walls

There is a positive intrapleural pressure

Pressure in the lungs is higher than the atmospheric pressure

#6. Name the chronic respiratory disorder caused mainly by cigarette smoking

Respiratory alkalosis

Emphysema

Asthma

Respiratory acidosis

Emphysema is characterised by inflation of alveoli which is mainly due to chronic cigarette smoking.

#7. Reduction in pH of blood will

Release bicarbonate ions by the liver

Reduce the rate of heart beat

Reduce the blood supply to the brain

Decrease the affinity of hemoglobin with oxygen

Reduction in pH of blood favours the dissociation of oxyhemoglobin.

#8. Asthma may be attributed to

Accumulation of fluid in the lungs

Bacterial infection of the lungs

Allergic reaction of the mast cells in the lungs

Inflammation of the trachea

#9. When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

Rising CO_{2 and falling O₂ concentration}

Falling O₂ concentration

Rising CO_{2 concentration}

Falling CO₂ concentration

#10. Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs

As bicarbonate ions

In the form of dissolved gas molecules

By binding to R.B.C

As carbamino - haemoglobin

#11. A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O2

Helps in releasing more O2 to the epithelial tissues

Acts as a reserve during muscular exercise

Raises the pCO2 of blood to 75 mm of Hg.

Is enough to keep oxyhaemoglobin saturation at 96%

#12. Bulk of carbon dioxide (CO₂) released from body tissues into the blood is present as

70% carbamino-haemoglobin and 30% as bicarbonate

Carbamino-haemoglobin in RBCs

Bicarbonate in blood plasma and RBCs

Free CO2 in blood plasma

#13. What is vital capacity of our lungs?

Total lungs capacity minus residual volume

Inspiratory reserve volume plus tidal volume

Total lungs capacity minus expiratory reserve volume

Inspiratory reserve volume plus expiratory reserve volume

Vital capacity is the maximum volume of air a person can breathe in after a forceful expiration.

Vital capacity (VC) = Total lung capacity – Residual volume

#14. Which group of animals respire through lungs?

Earthworm and insects

Sponges, coelenterates and flatworms

Fishes and aquatic arthropods

Amphibians, reptiles, birds and mammals

#15. Skin of man cannot act as a respiratory organ because

It is dry

It is not thin

It is not permeable to O₂ and CO₂

All of these

#16. What is the function of respiratory part of human respiratory system?

It clears the incoming air from foreign particles

It brings the temperature of air upto the body temperature

It transports the atmospheric air

It exchanges O2 and CO2 between blood and atmospheric air

#17. Ventrally and laterally, the thoracic chamber is formed by

Diaphragm and sternum respectively

Ribs and sternum respectively

Sternum and ribs respectively

Vertebral column and diaphragm respectively

Thoracic cavity is formed :

Dorsally – By the vertebral column

Ventrally – By the sternum

Laterally – By the ribs

#18. Which of the following prevents collapsing of trachea?

Muscles

Diaphragm

Ribs

Cartilaginous rings

Trachea is lined by C-shaped cartilagenous ring, which prevents the collapsing of trachea.

#19. Number of alveoli in the human lungs has been estimated to be approximately

100 million

300 million

700 million

436 million

There are approximately 600 – 800 million alveoli in the two lungs of a human being

#20. Diaphragm is a dome-shaped muscular structure which separates

Thoracic cavity from abdominal cavity

Coelomic cavity from pelvic cavity

Pleural cavity from thoracic cavity

Pelvic cavity from abdominal cavity

#21. An additional volume of air, a person can inspire by a forceful inspiration is known as

Inspiratory capacity

Expiratory capacity

Expiratory reserve volume

Inspiratory reserve volume

#22. Volume of air remains in the lungs after normal expiration is

ERV + RV

IRV + RV

RV + IRV + ERV

#23. Solubility of CO₂ is ______ times higher than that of O₂

40 - 45

20 - 25

30 - 25

50 - 25

#24. What is the value of pO₂ in alveoli and tissues respectively?

104 mm Hg and 150 mm Hg

45 mm Hg and 0.3 mm Hg

104 mm Hg and 40 mm Hg

95 mm Hg and 159 mm Hg

#25. How many O₂ molecules can bind with single molecule of Hb?

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