Respiration in Animals
Multiple Choice Questions and Answers
1. Volume of air inspired or expired in relaxed position is
(a) 500ml
(b) 300ml
(c) 150 ml
(d) 115 ltr
Answer: (a) 500ml
2. Connecting link between glycolysis and TCA cycle is
(a) acetyl CoA
(b) pyruvate
(c) succinate
(d) fumarate
Answer: (b) pyruvate
3. In which of the following animal respiration occurs without any respiratory organ?
(a) cockroach
(b) fish
(c) frog
(d) earthworm
Answer: (d) earthworm
4. Ciliated cells are found in
(a) bronchus
(b) pancreas
(c) liver
(d) uterus
Answer: (a) bronchus
5. Buccopharyngeal respiration in frog
(a) is increased when nostrils are closed
(b) stops when there is pulmonary respiration
(c) is increased when it is catching fly
(d) stops when mouth is opened
Answer: (b) stops when there is pulmonary respiration
6. Voice in mammals is produced by
(a) by syrinx
(b) by bronchus
(c) during inhalation
(d) during exhalation
Answer: (d) during exhalation
7. During carbon dioxide transport, HCO3 diffuses from erythrocytes to plasma and in turn affects the ionic equilibrium momentarily. In order to keep the ionic balance, an equal number of C1 ions pass into the erythrocytes from plasma. This process is known as
(a) Hamburger phenomenon
(b) bicarbonate shift
(c) transport rate
(d) carbonation
Answer: (a) Hamburger phenomenon
8. Automobile exhaust causes respiratory problems because of the presence of
(a) CO
(b) CH4
(c) Chlorine
(d) NO2
Answer: (a) CO
9. Book lungs are respiratory organs of
(a) mollusca
(b) mammals
(c) arachnida
(d) earthworm
Answer: (c) arachnida
10. The power house of energy in cells is
(a) golgi bodies
(b) mitochondria
(c) ribosomes
(d) endoplasmic reticulum
Answer: (b) mitochondria
11. The respiratory centre in the brain is stimulated by
(a) carbon dioxide concentration in venous blood
(b) oxygen concentration in artery blood
(c) carbon dioxide concentration in artery blood
(d) oxygen concentration in venous blood
Answer: (c) carbon dioxide concentration in artery blood
12. Arytenoid cartilage occurs in
(a) nose
(b) larynx
(c) hyoid
(d) sternum
Answer: (b) larynx
13. The energy currency of a cell is
(a) AMP
(b) ATP
(c) carbohydrates
(d) NAD
Answer: (b) ATP
14. The net energy yield from aerobic respiration in eukaryotes cell is
(a) 10 ATP
(b) 30 ATP
(c) 36 ATP
(d) 38 ATP
Answer: (c) 36 ATP
15. The volume of air breathed in and out during effortless respiration is referred to as
(a) vital volume
(b) residual volume
(c) ideal volume
(d) tidal volume
Answer: (d) tidal volume
16. Main function of lenticel is
(a) transpiration
(b) guttation
(c) gaseous exchange
(d) bleeding
Answer: (c) gaseous exchange
17. One haemoglobin carry how many molecule of oxygen
(a) 4
(b) 2
(c) 6
(d) 8
Answer: (a) 4
18. Oxyhemoglobin dissociates at
(a) high PO2
(b) low PO2 in tissues
(c) equal PO2
(d) all times irrespective of PO2
Answer: (b) low PO2 in tissues
19. Movement of CO2 and O2 across the alveoli and capillaries takes place by
(a) imbibition
(b) carrier transport
(c) diffusion
(d) active transport
Answer: (c) diffusion
20. CO2 is carried mainly in the form of
(a) bicarbonates
(b) carboxy-haemoglobin
(c) plasma
(d) none of these
Answer: (a) bicarbonates
21. During expiration diaphragm becomes
(a) flattened
(b) dome-shaped
(c) oblique
(d) normal
Answer: (b) dome-shaped
22. Respiratory Quotient is less than 1 for
(a) banana
(b) potato
(c) citrus fruits
(d) castor seeds
Answer: (c) citrus fruits
23. During one circuit of blood from lungs to the tissues and back through circulatory system the percentage of haemoglobin giving up oxygen is
(a) 50%
(b) 25%
(c) 75%
(d) 100%
Answer: (b) 25%
24. The blood leaving the lungs has all its haemoglobin present in oxygenated form and gives up oxygen to the tissues, because
(a) the tissues can absorb oxygen from oxyhaemoglobin
(b) oxygen concentration in tissues is higher and carbon dioxide concentration lower than in the lungs
(c) oxyhaemoglobin undergoes reduction
(d) oxygen concentration in tissues is lower than carbon dioxide concentration higher than in the lungs
Answer: (d) oxygen concentration in tissues is lower than carbon dioxide concentration higher than in the lungs
25. Which of the following facts suggests that oxygen is transported from lungs to the tissue combines with haemoglobin rather than dissolved in blood plasma?
(a) oxygen carrying capacity of whole blood is higher than that of plasma and oxygen content of blood leaving the glands is greater than that of blood entering the lungs
(b) hemoglobin can combine with oxygen
(c) oxyhaemoglobin can dissociate into haemoglobin and oxygen
(d) an increase in carbon dioxide concentration decreases the oxygen affinity of hemoglobin
Answer: (a) oxygen carrying capacity of whole blood is higher than that of plasma and oxygen content of blood leaving the glands is greater than that of blood entering the lungs
26. Body tissues of obtain oxygen from oxyhaemoglobin because of its dissociation caused by
(a) low oxygen concentration
(b) low oxygen and high carbon dioxide concentration
(c) low carbon dioxide concentration
(d) high carbon dioxide concentration
Answer: (b) low oxygen and high carbon dioxide concentration
27. If a person stays on Mount Everest for some days
(a) his blood will step up production of red blood corpuscles
(b) his blood will step down production of red blood corpuscles
(c) there will be no change in the content of red blood corpuscles in his body
(d) his red blood corpuscles will turn into large cells
Answer: (a) his blood will step up production of red blood corpuscles
28. If a man from sea coast of Kerala goes to Mount Everest
(a) his breathing rate and heart beat will increase
(b) his breathing rate and heart beat will decrease
(c) his breathing rate will increase but heartbeat will decrease
(d) his breathing rate will decrease but heartbeat will increase
Answer: (a) his breathing rate and heart beat will increase
29. In which form carbon dioxide is carried in blood
(a) sodium bicarbonate
(b) sodium carbonate
(c) potassium carbonate
(d) magnesium bicarbonate
Answer: (c) potassium carbonate
30. Mammalian lungs contain an enormous number of minute alveoli (air sacs). This is to allow
(a) more space for increasing the total volume of inspired air
(b) more surface area for diffusion of gases
(c) more spongy texture for keeping lungs in proper shape
(d) more nerve supply to keep the organs working more efficiently
Answer: (a) more space for increasing the total volume of inspired air
31. Tidal air in mammalian lungs is
(a) total maximum air that can be drawn into lungs
(b) air that normally goes in and comes out of lungs during breathing
(c) air that is left in the lungs after normal expiration
(d) air that can be expelled out from lungs forcibly after normal expiration
Answer: (b) air that normally goes in and comes out of lungs during breathing
32. The largest quantity of air that can be expired after a maximal inspiratory effort is
(a) residual volume
(b) tidal volume
(c) vital capacity of lungs
(d) lung volume
Answer: (d) lung volume
33. The combination of haemoglobin with oxygen the blood can be promoted by
(a) decreasing oxygen concentration in blood
(b) increasing oxygen concentration in blood
(c) increasing carbon dioxide concentration in blood
(d) introducing CO into blood
Answer: (d) introducing CO into blood
34. When man inhales air containing normal concentration of O2 as well as CO he suffers from suffocation because
(a) CO2 reacts with O2 which is thus removed from air entering the lungs
(b) haemoglobin combines with CO2 instead of with O2 and the product cannot dissociate
(c) CO affects the diaphragm and intercostal muscles
(d) CO affects the nerves of the lungs
Answer: (a) CO2 reacts with O2 which is thus removed from air entering the lungs
35. Sudden deep inspiration is due to
(a) increase in concentration of oxygen
(b) increase in concentration of CO2
(c) decrease in concentration of CO2
(d) either increase in concentration of CO2 or decrease in the concentration of CO2
Answer: (b) increase in concentration of CO2
36. Breathing centre that controls normal breathing in mammals lies in
(a) cerebrum
(b) cerebellum
(c) midbrain
(d) medulla oblongata
Answer: (c) midbrain
37. Major fraction of CO2 released during cellular respiration is transported in blood to the lungs in the form of
(a) HCO3
(b) H2CO3
(c) as free CO2
(d) in combination of HbCO2
Answer: (b) H2CO3
38. A person with high fever may breathe faster than normal this may be due to
(a) additional requirement of O2 for the invader germs
(b) high temperature of body
(c) mental worry of patient
(d) loss of appetite
Answer: (d) loss of appetite
39. The impulse of voluntary forced breathing starts in
(a) medulla
(b) vagus nerve
(c) cerebral hemisphere
(d) spinal cord
Answer: (a) medulla
40. Forced deep breathing for a few minutes by a person sitting at rest may be followed by a temporary cessation of breathing. This influences
(a) too much oxygen in blood
(b) too much CO2 in blood
(c) very little CO2 in blood
(d) both too much O2 and very little CO2 in blood
Answer: (c) very little CO2 in blood
41. Which one of the following does not contribute to the breathing movement in mammals?
(a) ribs
(b) diaphragm
(c) abdominal muscles
(d) larynx
Answer: (a) ribs
42. A man respires about
(a) 16 to 20 times per minute
(b) 40 times per minute
(c) 72 times per minute
(d) 100 times per minute
Answer: (a) 16 to 20 times per minute
43. If under certain conditions the P50 value of haemoglobin rises 100mm Hg, a person will die of oxygen deficiency the pigment
(a) cannot load oxygen in the lungs
(b) can load enough oxygen in the lungs but cannot unload it in tissues
(c) can neither load nor unload oxygen
(d) suffers degradation and cannot function normally
Answer: (d) suffers degradation and cannot function normally
44. Name the respiratory organs of frog
(a) lungs buccal cavity and skin
(b) trachea
(c) gills
(d) none of these
Answer: (a) lungs buccal cavity and skin
45. Vital capacity of an average person is
(a) 4500-5000ml
(b) 4000-4500ml
(c) 3000-3500ml
(d) 2000-2500ml
Answer: (a) 4500-5000ml
46. Name the organ which produces sound
(a) larynx
(b) pharynx
(c) epiglottis
(d) none of these
Answer: (a) larynx
47. Name the respiratory organ of whale
(a) lungs
(b) gills
(c) body surface
(d) trachea
Answer: (a) lungs
48. Name the respiratory organs of leech and prawn
(a) skin spiracles and tracheoles
(b) gills
(c) trachea
(d) none of these
Answer: (a) skin spiracles and tracheoles
49. Foods and air passages cross in the
(a). Larynx
(b). Pharynx
(c). Epiglottis
(d). Trachea
Answer: (b). Pharynx
50. How many lobes are there in human lungs?
(a) left lung has two lobes and right has three
(b) left lung has three lobes and right has two
(c) left lung has two lobes and right has two
(d) left lung has three lobes and right has three
Answer: (a) left lung has two lobes and right has three