Objective Questions

Question. Which of the following has no specialized respiratory structures ?
(a) Crab
(b) Earthworm
(c) Salmon
(d) Ant

Question. Lungs are present in
(a) mediastinum
(b) pleural cavity
(c) pericardial cavity
(d) thoracic cavity

Question. Intercostal muscles are found attached with
(a) diaphragm
(b) ribs
(c) pleura
(d) lungs

Question. The nose produces ____________ to put moisture in the air and catch dust and bacteria.
(a) mucus
(b) bronchi
(c) cilia
(d) oxygen

Question. The path that leads from the throat to the lungs is known as
(a) trachea
(b) oesophagus
(c) epiglottis
(d) larynx

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion: If two men, expire the same volume of air after normal inspiration, they have the same expiratiory capcity.
Reason: Expirtory capacity includes tidal valume and inspiratory reserve volume.

Question. Assertion: The abdominal muscles are primarily involved in generating pressure gradient between the lungs and the atmosphere.
Reason: The strength of inspiration and expiration can be increased by additional muscles in diaphragm and intercostal muscles.

Matching Type Questions

Question. Match the column I (Animals) with column II (Mode of respiration) and choose the correct option.

Column – I (Animals)	Column – II (Mode of respiration)
A. Earthworm	I. Pulmonary
B. Human	II. Branchial
C. Prawn	III. Tracheal
D. Insects	IV. Cutaneous

(a) A – I; B – II; C – III; D – IV
(b) A – IV; B – II; C – I; D – III
(c) A – IV; B – I; C – II; D – III
(d) A – III; B – II; C – IV; D – I

Question. Listed below are four respiratory capacities (A-D) in column I and four jumbled respiratory volume of a normal human adult in column II.

Column -I (Respiratory capacities)	Column-II (Respiratory volumes)
A. Residual volume	I. 2500 mL
B. Vital capacity	II. 3500 mL
C. Inspiratory reserve volume	III. 1200 mL
D. Inspiratory capacity	IV. 4500 mL

Which one of the following is the correct matching of two capacities and volume?
(a) A – I; B – II; C – III; D – IV.
(b) A – IV; B – III; C – I; D – II.
(c) A – II; B – III; C – IV; D – I.
(d) A – III; B – IV; C – I; D – II.

Question. Which one of the following four organs of respiratory system is correctly matched with its characteristics?
A. Bronchi – Two branches of the trachea that brings air into the lungs.
B. Trachea – Small flap that prevents food from entering
C. Diaphragm – Dome shaped muscle that pushes on the lungs during exhalation.
D. Alveoli – Pair of organs that inflate as you inhale and deflate as you exhale.
(a) A and B only
(b) C and D only
(c) A and C only
(d) B and D only

Critical Thinking Type Questions

Question. About 70% of CO₂ is transported as
(a) carbonic acid
(b) darboxyhaemoglobin
(c) bicarbonates
(d) carbamino compounds

Question. Even when there is no air in it, human trachea does not collapse due to presence of
(a) bony rings
(b) turgid pressure
(c) chitinous rings
(d) cartilaginous rings

Question. During inspiration in mammals, the diaphragm becomes
(a) dome shaped
(b) raised highly
(c) flat
(d) static

Question. Combining of haemoglobin with O₂ in lungs can be promoted by
(a) decreasing CO₂ concentration in blood.
(b) decreasing O₂ concentration in blood.
(c) increasing CO₂ concentration in blood.
(d) introducing CO₂ into blood.

Question. What would happen if human blood becomes acidic (low pH)?
(a) Oxygen carying capacity of haemoglobin increases.
(b) Oxygen carrying capacity of haemoglobin decreases.
(c) RBCs count increases.
(d) RBCs count decreases.

Question. Low oxygen tension in the blood causes
(a) coughing
(b) yawning
(c) hiccuping
(d) sneezing

Question. Which of the following are the stages of respiration in correct order?
A – Gaseous transport
B – Cellular respiration
C – Tissue respiration
D – Breathing
(a) A – D – C – B
(b) D – A – C – B
(c) D – A – B – C
(d) D – C – B – A

Question. Functional residual capacity in human is the amount of air
(a) that can be filled in lungs by forceful inspiration.
(b) that can be breathed out after forceful expiration.
(c) that remains in the lungs after normal expiration.
(d) that remains in the lungs after forceful expiration.

Question. Number of RBCs per unit volume of blood is likely to be higher in a person living at high altitudes, because
(a) air is clean and unpolluted.
(b) more sunshine is available.
(c) air is less dense.
(d) vegetation gives out more O₂.