Practice Test

Q1) During inspiration what happens to the diaphragm? Show Answer

Q2) Each haemoglobin molecule can carry maximum of Show Answer

Q3) During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because
Show Answer

Q4) Which of the following combines irreversibly with blood haemoglobin? Show Answer

Q5) Respiratory centre of the brain is stimulated by Show Answer

Q6) At which thoracic vertebra does trachea divide into right and left primary bronchi? Show Answer

Q7) The partial pressure of oxygen in the alveolar air is Show Answer

Q8) During normal respiration without any effort the volume of air inspired or expired is called Show Answer

Q9) The respiratory membranes facilitates the exchange of respiratory gases through diffusion. Oxygen enters
the deoxygenated blood through diffusion because
Show Answer

Q10) What is vital capacity of our lungs? Show Answer

Q11) Which of the following statements is not true? Show Answer

Q12) One of the major cause of emphysema is Show Answer

Q13) 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

Q14) Lungs comprises Show Answer

Q15) The total thickness of the diffusion membrane of alveolus capillary is Show Answer

Q16) Which fact suggests that most oxygen is transported from lungs to the tissues combined with haemoglobin
rather than dissolved in blood plasma? Show Answer

Q17) How many layers are present in the diffusion membrane of alveolus capillary? Show Answer

Q18) Correct sequence of the air passage in humans is Show Answer

Q19) By which mechanism, oxygen is transported from lungs to cells? Show Answer

Q20) Actual site of exchange of gases in the lungs is
Show Answer

Q21) Every 100 mL of deoxygenated blood delivers approximately? Show Answer

Q22) Left shift of oxyhaemoglobin curve is noticed under Show Answer

Q23) A chemosensitive area is situated adjacent to the rhythm centre in the brain. This area is highly sensitive
to
Show Answer

Q24) Total lung capacity is Show Answer

Q25) Carbonic anhydrase is found in Show Answer

Q26) The breathing centre initiates the ventilation in response to Show Answer

Q27) Why does the air in the nasal cavity get warmed? Show Answer

Q28) Haemoglobin (Hb) is a Show Answer

Q29) How many molecules of oxygen can bind to a molecule of haemoglobin? Show Answer

Q30) Arrange the given steps by which the pulmonary volume increases in the sequence of events occurring
first
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
axis
Choose the correct option Show Answer

Q31) 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

Q32) Volume of air breathed in and out, while at rest is called Show Answer

Q33) Residual volume is Show Answer

Q34) 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

Q35) 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

Q36) 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

Q37) Name the artery which carries deoxygenated blood Show Answer

Q38) The factor which does not affect the rate of alveolar diffusion is Show Answer

Q39) Which portion of the human respiratory system is called sound box? Show Answer

Q40) Rate of breathing is controlled by Show Answer

Q41) Emphysema is a chronic disorder which is caused due to Show Answer

Q42) Movement of the air into and out of the lungs is carried out by Show Answer

Q43) The alveoli of lungs are lined by Show Answer

Q44) Respiratory or exchange part of the respiratory system comprises Show Answer

Q45) Haemoglobin of the human blood forms a stable complex compound with which of the following gas
leading to death? Show Answer

Q46) 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

Q47) Oxyhaemoglobin in the blood is formed when Show Answer

Q48) The vital capacity of human lung is equal to Show Answer

Q49) Oxygen dissociation curve is Show Answer

Q50) Haemoglobin is the red coloured iron containing pigment which is present in Show Answer

Q51) Primary site of the gaseous exchange in humans is
Show Answer

Q52) Carbon dioxide is transported in blood in the form of Show Answer

Q53) Why carbon monoxide (CO) poisonous for man? Show Answer

Q54) 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

Q55) Which of the following diseases are occupational respiratory disorders? Show Answer

Q56) In humans, exchange of gases occurs Show Answer

Q57) About 1200 mL of air is always known to remain inside the human lungs. It is described as Show Answer

Q58) Respiratory centre is present in Show Answer

Q59) Larynx is present in between Show Answer

Q60) 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

Q61) A spirometer cannot be used to measure Show Answer

Q62) Which of the following respiratory organs are present in spiders and scorpions?
Show Answer

Q63) When temperature decreases oxyhaemoglobin curve will become Show Answer

Q64) Skin is an accessory organ of respiration in Show Answer

Q65) Which ribs show ‘bucket- handle’ type of movement?
Show Answer

Q66) Haemoglobin (Hb) transports oxygen from the lungs to tissues. The partial pressure of the oxygen in lungs
is different from that tissues. Each Hb can bind to up to four oxygen molecules. Suppose, we have an equal
number of Hb and oxygen molecules and all the oxygen molecules are in bounded form. Then, which of the
following is true? Show Answer

Q67) 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

Q68) Which one of the following is the correct statement regarding the process of respiration in humans? Show Answer

Q69) Approximate volume of air a healthy man can expire or inspire per minute is Show Answer

Q70) 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

Q71) Lungs have a large number of narrow tubes called Show Answer

Q72) Identify the correct statement with reference to transport of respiratory gases by blood? Show Answer

Q73) Only carbon dioxide is transported by blood Show Answer

Q74) The expiratory reserve volume will be Show Answer

Q75) Correct sequence of the air passage in humans is Show Answer

Q76) Diffusion membrane is made up of Show Answer

Q77) Partial pressure of the gas is the pressure contributed by Show Answer

Q78) How much amount of air can be inspired or expired during normal breathing? Show Answer

Q79) Hiccup occurs due to Show Answer

Q80) Arrange the following in the order of increasing volume:
I. Tidal volume
II. Residual volume
III. Expiratory reserve volume
IV. Vital capacity Show Answer

Q81) Friction on the lungs surface reduces by Show Answer

Q82) What are the favourable conditions for oxyhaemoglobin? Show Answer

Q83) A muscular transverse partition in mammals that separates thorax from abdomen is called Show Answer

Q84) Which part of the brain is called respiratory rhythm centre? Show Answer

Q85) Dissociation curve of haemoglobin is Show Answer

Q86) Haemoglobin is having maximum affinity with Show Answer

Q87) 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

Q88) Exchange of gases in lungs occurs through Show Answer

Q89) Why do human beings face difficulty to breath in high elevations? Show Answer

Q90) Pneumotaxic centre of the brain can Show Answer

Q91) Tidal volume is Show Answer

Q92) Under which condition, dissociation of oxygen from oxyhaemoglobin in tissues occurs? Show Answer

Q93) Pleural membrane is covering of Show Answer

Q94) Factors affecting the rate of diffusion is/are Show Answer

Q95) Which is true? Show Answer

Q96) After deep inspiration, capacity of maximum expiration of lung is called Show Answer

Q97) During expiration, the diaphragm becomes Show Answer

Q98) 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

Q99) Which of the following statement is false? Show Answer

Q100) 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

Q101) Asthama is caused by Show Answer

Q102) 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

Q103) 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

Q104) Exchange of gases in man takes place in Show Answer

Q105) Inspiration is initiated by Show Answer

Q106) During inspiration, the diaphragm Show Answer

Q107) Air entering the lungs is Show Answer

Q108) 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

Q109) Conducting part of the respiratory system comprises Show Answer

Q110) After a deep inspiration and maximum expiration, the capacity of lungs is known as Show Answer

Q111) iven below are two statements: One is labelled as Assertion A and the
other is labelled as Reason R.
Assertion A: During the transportation of gases, about 20 − 25 percent
of CO2 is carried by Haemoglobin as carbamino-haemoglobin.
Reason R : This binding is related to high pCO2 and low pO2 in tissues.
In the light of the above statements, choose the correct answer from the
options given below. Show Answer

Q112) Which of the following factors are favourable for the formation of
oxyhaemoglobin in alveoli? Show Answer

Q113) Vital capacity of lung is Show Answer

Q114) Select the sequence of steps in Respiration.
(A) Diffusion of gases (O2. and CO2) across alveolar membrane.
(B) Diffusion of O2 and CO2 between blood and tissues.
(C) Transport of gases by the blood
(D) Pulmonary ventilation by which atmospheric air is drawn in
and CO2 rich alveolar air is released out.
(E) Utilisation of O2 by the cells for catabolic reactions are resultant
release of CO2 Show Answer

Q115) Given below are two statements: one is labelled as Assertion (A) and the
other is labelled as Reason (R).
Assertion (A) :
A person goes to high altitude and experiences "Altitude Sickness" with
symptoms like breathing difficulty and heart palpitations.
Reason (R) :
Due to low atmospheric pressure at high altitude, the body does not get
sufficient oxygen.
In the light of the above statements, choose the correct answer from the
options given below : Show Answer

Q116) Which of the following statements are correct with respect to vital
capacity?
(a) It includes ERV, TV and IRV.
(b) Total volume of air a person can inspire after a normal expiration.
(c) The maximum volume of air a person can breathe in after forced
expiration.
(d) It includes ERV, RV and IRV.
(e) The maximum volume of air a person can breathe out after a forced
inspiration. Choose the most appropriate answer from the options given
below. Show Answer

Q117) Which of the following is not the function of conducting part of
respiratory system? Show Answer

Q118) The partial pressures (in mmH g ) of oxygen (O2) and carbon dioxide
(CO2) at alveoli (the site of diffusion) are: Show Answer

Q119) Select the favourable conditions required for the formation of
oxyhaemoglobin at the alveoli. Show Answer

Q120) Select the correct events that occur during inspiration.(i) Contraction of
diaphragm
(ii) Contraction of external inter-costal muscles
(iii) Pulmonary volume decreases
(iv) Intra pulmonary pressure increases Show Answer

Q121) Identify the wrong statement with reference totransport of oxygen. Show Answer

Q122) Select the correct statement. Show Answer

Q123) The maximum volume of air a person can breathe in after a forced
expiration is known as : Show Answer

Q124) Tidal volume and Expiratory reserve volume of an athlete is 500 mL and
1000 mL respectively.
What will be his Expiratory capacity if the residual volume is 1200 mL? Show Answer

Q125) Due to increasing air-borne allergens and pollutants, many people in
urban areas are suffering from respiratory disorder causing wheezing
due to: Show Answer

Q126) Which of the following is an occupational respiratory disorder? Show Answer

Q127) Lungs are made up of air-filled sacs, the alveoli. They do not collapse
even after forceful expiration, because of Show Answer

Q128) The partial pressure of oxygen in the alveoli of the lungs is Show Answer

Q129) Lungs do not collapse between breaths and some air always remains in
the lungs which can never be expelled because Show Answer

Q130) Reduction in pH of blood will Show Answer

Q131) Name the chronic respiratory disorder caused mainly by cigarette
smoking. Show Answer

Q132) Asthma may be attributed to Show Answer

Q133) Name the pulmonary disease in which alveolar surface area involved in
gas exchange is drastically reduced due to damage in the alveolar walls. Show Answer

Q134) When you hold your breath, which of the following gas changes in blood
would first lead to the urge to breathe? Show Answer

Q135) Match List-I with List-II.
Choose the correct answer from the options given below:
Show Answer