Breathing and Exchange of Gases

NEET Biology · 40 questions · Page 3 of 4 · Click an option or "Show Solution" to reveal answer

Q21

Which of the following is an occupational respiratory disorder?

A Anthracis

B Silicosis

C Emphysema

D Botulism

Correct Answer

Option B

Solution

(b) Silicosis is an occupational disease caused due to excess inhalation of silica dust.

Q22

Which part of poppy plant is used to obtain the drug Smack?

A Flowers

B Latex

C Leaves

D Roots

Correct Answer

Option B

Solution

(b) Smack (Heroin) is obtained from the latex of unripe capsule of Poppy plant.

Q23

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

A benign growth on mucous lining of nasal cavity.

B inflammation of bronchi and bronchioles.

C proliferation of fibrous tissues and damage of the alveolar walls.

D reduction in the secretion of surfactants by pneumocytes.

Correct Answer

Option B

Solution

(b) Asthma causes wheezing due to inflammation of bronchi and bronchioles.

Q24

Listed below are four respiratory capacities. Which one of the following is the correct matching of two capacities and volumes?

A (ii) 2500 mL , (iii) 4500 mL

B (iii) 1200 mL , (iv) 2500 mL

C (iv) 3500 mL , (i) 1200 mL

D (i) 4500 mL , (ii) 3500 mL

Correct Answer

Option C

Solution

(c) Residual volume = 1200 mL; Vital capacity = 4500 mL; Inspiratory reserve volume = 2500 mL; Inspiratory capacity = 3500 mL.

Q25

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

A bicarbonate in blood plasma and RBCs

B free CO2 in blood plasma

C 70% carbamino-haemoglobin and 30% as bicarbonate

D carbamino-haemoglobin in RBCs

Correct Answer

Option A

Solution

(a) 70-75% CO2 is transported as bicarbonate ion (HCO3) in blood plasma.

Q26

Which one of the following is a possibility for most of us in regard to breathing?

A One can breathe out air that contains very little or no oxygen.

B One can breathe out air through eustachian tubes by closing both the nose and the mouth.

C One can consciously breathe in and breathe out by moving the diaphragm alone.

D The lungs cannot be made fully empty by forcefully breathing out all air from them

Correct Answer

Option B

Solution

(b) Eustachian tube connects middle ear cavity with nasopharynx and allows air pressure equalization.

Q27

The figure shows a diagrammatic view of human respiratory system. Identify C - Alveoli.

A B-pleural membrane-surrounds ribs on both sides to provides cushion against rubbing.

B C-Alveoli-thin walled vascular bag like structures for exchange of gases.

C D-Lower end of lungs-diaphragm pulls it down during inspiration

D A-trachea-long tube supported by complete cartilaginous rings for conducting inspired air.

Correct Answer

Option B

Solution

(b) Alveoli are very thin, irregular walled bag like structures for gaseous exchange.

Q28

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

A Inspiratory Reserve Volume

B Tidal Volume

C Expiratory Reserve Volume

D Residual Volume

Correct Answer

Option D

Solution

(d) Residual volume prevents the collapsing of alveoli after forceful expiration.

Q29

Tidal volume = 500 mL and Expiratory reserve volume = 1000 mL. What is Expiratory capacity?

A 1500 mL

B 1700 mL

C 2200 mL

D 2700 mL

Correct Answer

Option A

Solution

(a) Expiratory capacity = TV + ERV = 500 + 1000 = 1500 ml.

Q30

The maximum volume of air a person can breathe in after a forced expiration is known as :

A Total lung capacity

B Expiratory capacity

C Vital capacity

D Inspiratory capacity

Correct Answer

Option C

Solution

(c) Vital capacity is the maximum amount of air expired after forceful inspiration or inspired after forceful expiration.

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