NCERT Class 11-Biology: Chapter – 17 Breathing and Exchange of Gases Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 10:

Respiratory process is regulated by certain specialized centres in the brain. One of the following listed centres can reduce the inspiratory duration upon stimulation

a. Medullary inspiratory centre

b. Pneumotaxic centre

c. Apneustic centre

d. Chemosensitive centre

Answer: (b)

Question 11:

dissociates from carbamino haemoglobin when

a. is high & is low

b. is high and is low

c. and are equal

d. None of the above

Answer: (b)

Question 12:

In breathing movements, air volume can be estimated by

a. Stethoscope

b. Hygrometer

c. Sphignomanometer

d. Spirometer

Answer: (d)

Question 13:

Identify the correct and incorrect match about respiratory volume and capacities and mark the correct answer

i. Inspiratory capacity (IC) = Tidal Volume + Residual Volume

ii. Vital Capacity (VC) = Tidal Volume (TV) + Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV) .

iii. Residual Volume (RV) = Vital Capacity (VC) – Inspiratory Reserve Volume (IRV)

iv. Tidal Volume (TV) = Inspiratory Capacity (IC) – Inspiratory Reserve Volume (IRV) Options:

a. (i) Incorrect, (ii) Incorrect, (iii) Incorrect, (iv) Correct

b. (i) Incorrect, (ii) Correct, (iii) Incorrect, (iv) Correct

c. (i) Correct, (ii) Correct, (iii) Incorrect, (iv) Correct

d. (i) Correct, (ii) Incorrect, (iii) Correct, (iv) Incorrect

Answer: (b)

Question 14:

The oxygen - haemoglobin dissociation curve will show a right shift in case of

a. High

b. High

c. Low

d. Less concentration

Answer: (b)

Question 15:

Match the following and mark the correct options

Chapter 16 - Question 15 Match the Correct Options
AnimalRespiratory Organ
A.Earthwormi.Moist cuticle
B.Aquatic Arthropodsii.Gills


a. A-ii, B-i, C-iv, D-iii

b. A-i, B-iv, C-ii, D-iii

c. A-i, B-iii, C-ii, D-iv

d. A-i, B-ii, C-i. v, D-iii

Answer: (b)

Very Short Answer Type Questions

Question 1:

Define the following terms?

a. Tidal volume

b. Residual volume

c. Asthma


a. Tidal Volume: Volume of air inhaled and exhaled during a normal breathing cycle without any forced breathing is tidal volume. The normal range of tidal volume in a young adult is 500 ml per inspiration.

b. Residual Volume: Volume of air left in the lungs even after forced exhalation is called as residual volume. The normal range of residual volume in a young adult is 1100 - 1200 ml.

c. Asthma: It is an inflammatory disease of the airways of the lungs. Due to which the airway gets narrowed and excess mucus secretion takes place resulting in breathing difficulty.