Free Breathing And Exchange Of Gases (Weekly Quiz: 1) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Although much $CO_2$ is carried in blood, yet blood does not become acidic, because

(a) in $CO_2$ transport, blood buffers play an important role

(b) $CO_2$ is continuously diffused through the tissues and is not allowed to accumulate

(c) $CO_2$ is absorbed by the leucocytes

(d) $CO_2$ combines with water to form $H_2CO_3$ which is neutralised by Na$CO_3$

Question-2

___________ is the site of actual diffusion of $O_2$ and $CO_2$ between blood and atmospheric air.

(a) All bronchioles

(b) All bronchi

(c) All bronchi and terminal bronchioles

(d) Alveoli and their ducts

Question-3

A person suffers punctures in his chest cavity in an accident, without any damage to the lungs. Its effect could be

(a) Rapid increase in breathing rate

(b) Reduced breathing rate

(c) No change in respiration

(d) Cessation of breathing

Question-4

Under a given oxygen concentration in blood, dissociation of oxyhaemoglobin will increase if

(a) pH of blood rises

(b) pH of blood falls

(c) $CO_2$ concentration in blood falls

(d) Free fatty acid concentration in blood falls

Question-5

What is vital capacity of our lungs?

(a) Total lung capacity minus residual volume

(b) Inspiratory reserve volume plus expiratory reserve volume

(c) Inspiratory reserve volume plus tidal volume

(d) Total lung capacity minus expiratory reserve volume

Question-6

Pick the correct statement:

(a) RBCs transport oxygen only.

(b) Contraction of internal intercostals muscles lifts up the ribs and sternum.

(c) Thoracic cavity is anatomically an air tight chamber.

(d) Healthy man can inspire approximately 500 mL of air per minute. (e) During expiration the interpleural pressure is slightly below the surrounding atmospheric pressure.

Question-7

When $CO_{2}$ concentration in blood increases, breathing becomes

(a) there is no effect on breathing

(b) slow and deep

(c) shallower and slow

(d) faster and deeper

Question-8

Oxygen ($O_2$) is utilized by the organisms to __________ break down nutrient molecules like glucose and to derive energy for performing various activities.

(a) Indirectly

(b) Directly

(c) Incompletely

(d) Any of these

Question-9

The disease that occurs when the haemoglobin content of the blood goes down is –

(a) emphysema

(b) anaemia

(c) pleurisy

(d) pneumonia

Question-10

During inspiration, the air is brought into the lungs by the working of the thoracoabdominal pump whereby the :

(a) chest muscles pull the ribs up and out to widen the thoracic cavity

(b) abdominal muscles relax

(c) diaphragm contracts to lengthen the thoracic cavity

(d) all of the above