Practice Test

Q1) Each haemoglobin molecule can carry maximum of Show Answer

Q2) During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because
Show Answer

Q3) Which of the following combines irreversibly with blood haemoglobin? Show Answer

Q4) Respiratory centre of the brain is stimulated by Show Answer

Q5) At which thoracic vertebra does trachea divide into right and left primary bronchi? Show Answer

Q6) The partial pressure of oxygen in the alveolar air is Show Answer

Q7) During normal respiration without any effort the volume of air inspired or expired is called Show Answer

Q8) The respiratory membranes facilitates the exchange of respiratory gases through diffusion. Oxygen enters
the deoxygenated blood through diffusion because
Show Answer

Q9) What is vital capacity of our lungs? Show Answer

Q10) Which of the following statements is not true? Show Answer

Q11) One of the major cause of emphysema is Show Answer

Q12) State wheather the given statements are true or false
I. Respiration in humans is an active process
II. Diaphragm helps in generating the pressure gradient in the lungs
Choose the correct option Show Answer

Q13) Lungs comprises Show Answer

Q14) The total thickness of the diffusion membrane of alveolus capillary is Show Answer

Q15) Which fact suggests that most oxygen is transported from lungs to the tissues combined with haemoglobin
rather than dissolved in blood plasma? Show Answer

Q16) How many layers are present in the diffusion membrane of alveolus capillary? Show Answer

Q17) Correct sequence of the air passage in humans is Show Answer

Q18) By which mechanism, oxygen is transported from lungs to cells? Show Answer

Q19) Actual site of exchange of gases in the lungs is
Show Answer

Q20) Every 100 mL of deoxygenated blood delivers approximately? Show Answer

Q21) Left shift of oxyhaemoglobin curve is noticed under Show Answer

Q22) A chemosensitive area is situated adjacent to the rhythm centre in the brain. This area is highly sensitive
Show Answer

Q23) Total lung capacity is Show Answer

Q24) Carbonic anhydrase is found in Show Answer

Q25) The breathing centre initiates the ventilation in response to Show Answer

Q26) Why does the air in the nasal cavity get warmed? Show Answer

Q27) Haemoglobin (Hb) is a Show Answer

Q28) How many molecules of oxygen can bind to a molecule of haemoglobin? Show Answer

Q29) Arrange the given steps by which the pulmonary volume increases in the sequence of events occurring
I. Contraction of intercostal muscles
II. Lifting up of the ribs
III. Sternum causing an increase in the volume of the thoracic chamber in dorsoventral axis
IV. Contraction of the diaphragm which increases the volume of the thoracic chamber in antero-posterior
Choose the correct option Show Answer

Q30) During swallowing, glottis can be covered by a thin elastic cartilaginous flap called …A… to prevent the
entry of food into larynx. Trachea is a straight tube extending up to …B… cavity, which divides at the level
of 5th thoracic vertebra into right and left primary …C…
Choose the correct option for A, B and C from the given four options to complete the above statement with
reference to NCERT textbook Show Answer

Q31) Volume of air breathed in and out, while at rest is called Show Answer

Q32) Residual volume is Show Answer

Q33) Arrange the given steps of expiration in the sequence of event occurring first
I. Relaxation of the diaphragm and sternum
II. Reduction of the pulmonary volume
III. Expulsion of air from the lungs
IV. Increase in intra pulmonary pressure
Choose the correct option Show Answer

Q34) Identify the component of respiratory system which displays the features given below and choose the
correct option
I. Double layered
II. Fluid contained in it reduces the friction on the lung surface
III. Its outer layer is in contact with thoracic wall
IV. Its inner layer is in contact with lungs Show Answer

Q35) I. On an average a healthy human breathes 12-16 times/minute
II. The volume of air involved in the breathing movements can be estimated by spirometer
III. Diaphragm is very useful in both inspiration and expiration
Which of the above statements are incorrect?
Choose the correct option Show Answer

Q36) Name the artery which carries deoxygenated blood Show Answer

Q37) The factor which does not affect the rate of alveolar diffusion is Show Answer

Q38) Which portion of the human respiratory system is called sound box? Show Answer

Q39) Rate of breathing is controlled by Show Answer

Q40) Emphysema is a chronic disorder which is caused due to Show Answer

Q41) Movement of the air into and out of the lungs is carried out by Show Answer

Q42) The alveoli of lungs are lined by Show Answer

Q43) Respiratory or exchange part of the respiratory system comprises Show Answer

Q44) Haemoglobin of the human blood forms a stable complex compound with which of the following gas
leading to death? Show Answer

Q45) Among vertebrates, …A… use gills whereas reptiles, birds and mammals respire through the …B… .
Amphibians like frogs can respire through …C… also. Mammals have a well adapted respiratory system
Select appropriate choice for the blanks A, B and C to complete the given NCERT statement Show Answer

Q46) Oxyhaemoglobin in the blood is formed when Show Answer

Q47) The vital capacity of human lung is equal to Show Answer

Q48) Oxygen dissociation curve is Show Answer

Q49) Haemoglobin is the red coloured iron containing pigment which is present in Show Answer

Q50) Primary site of the gaseous exchange in humans is
Show Answer

Q51) Carbon dioxide is transported in blood in the form of Show Answer

Q52) Why carbon monoxide (CO) poisonous for man? Show Answer

Q53) Identify the type of pulmonary volume/capacity on the basis of quantity of air present in the lungs given
below. (Refer NCERT)
I. ~ 1100 mL – 1200 mL
II. ~ 500 mL
III. ~ 5000 mL – 6000 mL
Choose the correct option Show Answer

Q54) Which of the following diseases are occupational respiratory disorders? Show Answer

Q55) In humans, exchange of gases occurs Show Answer

Q56) About 1200 mL of air is always known to remain inside the human lungs. It is described as Show Answer

Q57) Respiratory centre is present in Show Answer

Q58) Larynx is present in between Show Answer

Q59) An …A… in the pulmonary volume …B… the intra pulmonary pressure to less than the atmospheric
pressure which forces the air from …C… to move into the lungs,i. e., …D…
Choose the correct options for the blanks A, B, C and D to complete the above statement with reference to
NCERT textbook Show Answer

Q60) A spirometer cannot be used to measure Show Answer

Q61) Which of the following respiratory organs are present in spiders and scorpions?
Show Answer

Q62) When temperature decreases oxyhaemoglobin curve will become Show Answer

Q63) Skin is an accessory organ of respiration in Show Answer

Q64) The thoracic chamber is formed dorsally by the ...A... ventrally by the ...B... laterally by the ...C... and on lower side by the dome-shaped ...D...
Select the right choices for A, B, C and D to complete the given NCERT statement. Show Answer

Q65) Which one of the following is the correct statement regarding the process of respiration in humans? Show Answer

Q66) Approximate volume of air a healthy man can expire or inspire per minute is Show Answer

Q67) Aerobic respiration involves:
I. external respiration.
II. transport of gases.
III. internal respiration.
IV. cellular respiration.
Choose the correct combination of options for the given statements. Show Answer

Q68) Lungs have a large number of narrow tubes called Show Answer

Q69) Identify the correct statement with reference to transport of respiratory gases by blood? Show Answer

Q70) Only carbon dioxide is transported by blood Show Answer

Q71) The expiratory reserve volume will be Show Answer

Q72) Correct sequence of the air passage in humans is Show Answer

Q73) Diffusion membrane is made up of Show Answer

Q74) Partial pressure of the gas is the pressure contributed by Show Answer

Q75) How much amount of air can be inspired or expired during normal breathing? Show Answer

Q76) Hiccup occurs due to Show Answer

Q77) Arrange the following in the order of increasing volume:
I. Tidal volume
II. Residual volume
III. Expiratory reserve volume
IV. Vital capacity Show Answer

Q78) Friction on the lungs surface reduces by Show Answer

Q79) What are the favourable conditions for oxyhaemoglobin? Show Answer

Q80) A muscular transverse partition in mammals that separates thorax from abdomen is called Show Answer

Q81) Which part of the brain is called respiratory rhythm centre? Show Answer

Q82) Dissociation curve of haemoglobin is Show Answer

Q83) Haemoglobin is having maximum affinity with Show Answer

Q84) Which two of the following changes (I-IV) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
I. Increase in red blood cell size.
II. Increase in red blood cell production.
III. Increased breathing rate.
IV. Increase in thrombocyte count.
Changes occurring are Show Answer

Q85) Exchange of gases in lungs occurs through Show Answer

Q86) Why do human beings face difficulty to breath in high elevations? Show Answer

Q87) Pneumotaxic centre of the brain can Show Answer

Q88) Tidal volume is Show Answer

Q89) Under which condition, dissociation of oxygen from oxyhaemoglobin in tissues occurs? Show Answer

Q90) Pleural membrane is covering of Show Answer

Q91) Factors affecting the rate of diffusion is/are Show Answer

Q92) Which is true? Show Answer

Q93) After deep inspiration, capacity of maximum expiration of lung is called Show Answer

Q94) During expiration, the diaphragm becomes Show Answer

Q95) Additional muscles in the ........ impacts the ability of humans to increase the strength of inspiration and expiration.
Complete the given NCERT statement with an appropriate option. Show Answer

Q96) Which of the following statement is false? Show Answer

Q97) Human beings have a significant ability to maintain and moderate the respiratory rhythm to suit the demands of the body tissues. This is achieved by Show Answer

Q98) Asthama is caused by Show Answer

Q99) Breathing involves …A… during which atmospheric air is drawn in and …B… by which the alveolar air is released out.
Choose the correct option for A and B to complete the given NCERT statement. Show Answer

Q100) Identify which respiratory structure possesses the following features and choose the correct option accordingly
I. Found in mammals
II. Highly muscular and fibrous partition, elevated towards the thorax like a dome
III. Separates thoracic and abdominal cavity Show Answer

Q101) Exchange of gases in man takes place in Show Answer

Q102) Inspiration is initiated by Show Answer

Q103) During inspiration, the diaphragm Show Answer

Q104) Air entering the lungs is Show Answer

Q105) Nasopharynx opens through the …A… of the larynx region into the …B…
Choose the correct option for A and B to complete the given NCERT statement. Show Answer

Q106) Site of aerobic respiration in higher organisms is/are Show Answer

Q107) Conducting part of the respiratory system comprises Show Answer

Q108) After a deep inspiration and maximum expiration, the capacity of lungs is known as Show Answer