NEET Practice Questions - Zoology - Breathing and Exchange of Gases

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  • Subject:

    Zoology

  • Chapter:

    Breathing and Exchange of Gases

NEET, 2015

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

(1) Falling O2 concentration

(2) Rising CO2 concentration

(3) Falling CO2 concentration

(4) Rising CO2 and falling O2 concentration

NEET, 2017

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

(a) Residual Volume (RV)

(b) Inspiratory Reserve Volume (IRV)

(c) Tidal Volume (TV)

(d) Expiratory Reserve Volume (ERV)

NEET, 2016

The partial pressure of oxygen in the alveoli of the lungs is  

(a) equal to that in the blood

(b) more than that in the blood

(c) less than that in the blood

(d) less than that of carbon dioxide

NEET, 2016

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

(a) there is a negative pressure in the lungs

(b) there is a negative intrapleural pressure pulling at the lung walls

(c) there is a positive intrapleural pressure

(d) pressure in the lungs in higher than the atmospheric pressure

NEET, 2016

Reduction in pH of blood will

(a) reduce the blood supply to the brain

(b) decrease the affinity of hemoglobin with oxygen

(c) release bicarbonate ions by the liver

(d) reduce the rate of heart beat

NEET, 2016

Name the chronic respiratory disorder caused mainly by cigarette smoking

(a) asthma

(b) respiratofy acidosis

(c) respiratory alkalosis

(d) emphysema

NEET, 2015

Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

(a) Pleurisy

(b) Pneumonia

(c) Emphysema

(d) Asthma

NEET, 2014

Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs

(a) as bicarbonate ions

(b) in the form of dissolved gas molecules

(c) by binding to RBC

(d) as carbamino-haemoglobin

NEET, 2013

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option, which gives correct identification and main function and/or characteristic.


(a) A-trachea-long tube supported by complete cartilaginous rings for conducting inspired air

(b) 8-pleural membrane-surround ribs on both sides to provide cushion against rubbing

(c) C-alveoli-thin walled vascular bag-like structures for exchange of gases

(d) D-lower end of lungs-diaphragm pulls it down during inspiration

NEET, 2012

Which one of the following is the correct statement for respiration in humans?

(a) Cigarette smoking may lead to inflammation of bronchi

(b) Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration

(c) Workers in grinding and stone breaking industries may suffer, from lung fibrosis

(d) About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbamino haemoglobin