Animal Physiology MCQs Part IV

1) The centre of phosphorylation is the
a) Oxisome
b) Peroxisome
c) Ribosome
d) Mitochondria

2) The source of energy in muscle contraction is
a) GTP
b) ADT
c) Creatinine
d) ATP

3) The maximum amount of oxygen is lost from the blood in the
a) Arteries
b) Capillaries of body
c) Left atrium of the heart
d) Capillaries surrounding the alveoli

4) Respiratory Quotient (RQ) for fat is
a) more than one
b) zero
c) one
d) less than one

5) The amount of energy released during the hydrolysis of a
bond of ATP is


6) Whena carbohydrate is subjected to aerobic respiration what will be the

a) 1.0
b) 0
c) 1.7
d) 1.4

7) The animal having two respiratory pigments is
a) Serpula
b) Glycera
c) Nerius
d) All

8) The last electron receptor in respiration is

9) A pyrophosphate cleavage takes place when
a) ATP is converted into AMP
b) ATP is converted into ADP
c) ADP is converted into AMP
d) AMP is converted into ATP

10) Anaerobic respiration, after glycolysis is also called
a) Fragmentation
b) Restoration
c) Multiplication
d) Fermentation

11) The exchange of gases in the alveoli of the lungs takes place by
a) Osmosis
b) Simple diffusion
c) Passive transport
d) Active transport

12) The number of tracheal rings in human beings is
a) 5 -10
b) 8 – 12
c) 16 – 20
d) 12 -24

13) What is the value of R.Q. with organic acids as the substrate?
a) 1
b) greater than 1
c) less than 1
d) 0

14) The enzymes which help in electron transfer are
a) Cytochromes
b) Isomerases
c) Proteases
d) All of these

15) Dyspnea is
a) Normal breathing
b) Difficult breathing
c) Rapid breathing
d) A stage without breathing

16) What part of the total ATP formed in a cell is synthesized in its mitochondria?
a) 30%
b) 60%
c) 90%
d) 99%

17) In anaerobic respiration the net gain of ATP is
a) 8
b) 4
c) 3
d) 2

18) EMP is another name for
b) Glycolysis
c) E.T.S.
d) Oxysomes

19) Trachea is double in
a) Echidna
b) Penguin
c) Whale
d) Dolphins

20) The Embden-Meyerhoff pathway occurs in the
a) Mitochondria
b) Nucleoplasm
c) Cytoplasm
d) Golgi complex

21) No respiratory pigment is found in the
a) Cockroach
b) Earthworm
c) Rabbit
d) Frog

22) In the housefly pseudotrachea are formed by the
a) Rostrum
b) Haustellium
c) Basiproboscis
d) Labella

23) Pouched gills are found in
a) Fishes
b) Cyclostomes
c) Amphibians
d) Aquatic mammals

24) Mountain sickness result due to
a) Anaemia and hypoxia
b) Arterial hypoxia
c) Lack of sufficient Hb
d) Lack of sufficient RBC

25) Internal respiration takes place in the
a) Chloroplast
b) Chromoplast
c) Mitochondria
d) All of these

26) In mitochondria, enzymes for
cycle are situated

a) On the inner membrane
b) On the outer membrane
c) On the outer and inner membranes
d) In the matrix

27) Tissue respiration is the process by which
a) Carbohydrates are synthesized
b) Proteins are broken down
c) Fat molecules are metabolized
d) Energy is liberated

28) Oxidative phosphorylation occurs during the process of
a) Protein synthesis
c) Respiration
d) Transpiration

29) In which animal does the diaphragm have no role in respiration?
a) Frog
b) Rat
c) Camel
d) Rabbit

30) Mitochondria supply most of the necessary biological energy by
a) Breakdown of sugar
b) Oxidising the substrates of the TCA cycle
c) Reducing NADP
d) Breakdown of protein

31) Biological oxidation in
cycle involves


32) The impulse for voluntary forced breathing starts in the
a) Medulla
b) Vagus
c) Cerebral hemisphere
d) Spinal cord

33) The largest quantity of air that can be expired after a maximal
inspiratory effort is called the

a) residual volume
b) tidal volume
c) vital capacity
d) total lung volume

34) The amount of carbon dioxide amount in atmospheric air normally is
a) 3%
b) 30%
c) 0.3%
d) 0.03%

35) The approximate composition of
in inspired and expired air is

a) 21% : 16%
b) 21% : 6%
c) 21% : 19%
d) 21% : 9%

36) The number of glucose molecules required to produce 38 ATP
molecules under anaerobic conditions by an yeast cell is

a) 19
b) 38
c) 2
d) 1

37) The efficiency of respiration is
a) 40%
b) 60%
c) 90%
d) 30%

38) The vital capacity of the human lung is equal to
a) 3500 ml
b) 4800 ml
c) 500 ml
d) 1200 ml

39) EMP (Embden, Meyerhoff and Parnas) is the biochemical pathway

a) glycolysis
b) Krebs cycle
c) Photosynthesis
d) None of these

40) The epithelial lining of the alveoli of the
lungs facing the lung cavity is

a) squamous ciliated
b) columnar, ciliated
c) columnar non-ciliated
d) squamous, non-ciliated

41) Mitochondria are yellow in colour due to the presence

a) xanthophyll
b) riboflavin
c) carotene
d) anthocyanin

42) Earthworms respire through their
a) moist skin
b) ctenidia
c) citellum
d) typhlosole

cycle is found in

a) anaerobic respiration
b) photorespiration
c) photosynthesis
d) aerobic respiration

44) The membrane covering the lungs is called the
a) pleural membrane
b) vitelline membrane
c) pericardial membrane
d) diaphragm

45) Respiration in mammals is of the type called
a) pulmonary respiration
b) gill respiration
c) cutaneous respiration
d) tracheal respiration

46) Complete oxidation of one gram mole of glucose
yields energy (in calories)

a) 6860000
b) 68600
c) 686000
d) 686

47) Lungs are enclosed in the
a) pericardium
b) pleural membrane
c) peritoneum
d) perichondrium

48) Assuming that 33.5
KJ of energy is absorbed for each mole of ADP
converted to ATP , respiratory efficiency is

a) 48%
b) 52%
c) 44%
d) 56%

49) When one molecule of glucose undergoes glycolysis
aerobically, the last stable product will be

a) one molecule of pyruvic acid
b) two molecules of pyruvic acid
c) three molecules of pyruvic acid
d) four molecules of pyruvic acid

50) The partial pressure of oxygen in inspired and expired
air is – and – mm Hg respectively:

a) 40, 95
b) 158, 40
c) 158, 116
d) 100, 95

51) Spiracles (in arthropoda) are
a) calcareous particles
b) excretory units
c) tracheal openings
d) sense organs

52) Residual air can be traced in the
a) alveoli
b) bronchi
c) nasal chambers
d) trachea


a) The respiratory coefficient
b) a temperature coefficient
c) a constant in quantum equations
d) a scale of quality

54) The ventilation rate may be expressed as
a) Inspiratory reserve volume x Frequency of respiration
b) Expiratory reserve volume x Frequency of respiration
c) Total volume x Frequency of respiration
d) Vital capacity x Frequency of respiration

55) The Bohr effect is related to the
a) reduced oxygen level in haemoglobin
b) reduced carbon dioxide level in blood
c) reduced carbon level in lymph
d) oxidated phosphorus level in blood

56) In a frog, if a hole is punched in the floor
of the buccal cavity, the frog will not
die as

a) he can breathe
b) pulmonary respiration occurs
c) buccal respiration does not stop
d) respiration will continue through organs other than the lungs

57) Respiration in Annelida occurs through the
a) lungs
b) general body surface
c) gills
d) all of the above

58) The haemoglobin oxygen dissociation curve is
a) sigmoid
b) constant
c) straight line
d) parabolic

59) The affinity of CO for Hb is … times more
than oxygen

a) 2 times
b) 20 times
c) 200 times
d) 1000 times

60) The substrates that are relatively reduced
will give an RQ

a) one
b) less than one
c) more than one
d) infinity

61) The end product of anaerobic respiration
in plants is

a) pyruvic acid
b) malic acid
c) ethyl alcohol
d) methyl alcohol

62) In sharks, there are
a) 4 pairs of gills covered by an operculum
b) 4 pairs of gills not covered by an operculum
c) 5 pairs of gills covered by an operculum
d) 5 pairs of gills not covered by an operculum

63) People living at high altitudes will have
a) A high alveolar capacity
b) A greater number of erythrocytes
c) A haemoglobin curve shifted towards the right
d) All of these

64) Body tissues obtain
from oxyhaemoglobin because of its dissociation
caused by


65) Carbon dioxide is transported via
blood to the lungs mostly

a) in the form of carbonic acid only
b) as carbaminohaemoglobin and as carbonic acid
c) in combination with haemoglobin only
d) dissolved in blood plasma

66) Which of the following is the product
of aerobic respiration?

a) Malic acid
b) Lactic acid
c) Pyruvic acid
d) Ethyl alcohol

67) Pyruvic acid is formed during
b) glycolysis
c) ornithine cycle
d) photophosphorylation

68) This formula represents glycolysis

69) The ventilation movements of the lungs
in mammals are governed by the

a) diaphragm
b) costal muscles
c) The muscular walls of the lung
d) both (a) and (b)

70) Mammalian lungs have an enormous number
of minute alveoli (air space). This allows

a) more space for increasing the volume of inspired air
b) more surface area for the diffusion of gases
c) A more spongy texture to keep the lung in the proper shape
d) Better nerve supply to keep the lungs working

phenomenon is also known as

a) sodium-potassium pump
b) hydrogen shift mechanism
c) chloride shift mechanism
d) carbonic acid shift mechanism

72) Which of the following has no blood
but inspires?

a) Hydra
b) Earthworm
c) Cockroach
d) Leech

73) Double fermentation process is adapted
in the preparation of

a) alcohol
b) bread
c) vitoqa
d) curd

74) The membrane bound enzyme involved in
cycle is

a) malate dehydrogenase
b) cis-aconitase
c) fumarase
d) succinic dehydrogenase

oxidation takes place in the following
before entering into citric acid

a) fatty acids
b) sugars
c) proteins
d) all of the above

76) Pick up the false statement:
a) scurvy is associated with deficiency of ascorbic acid
b) blood from the right side of the heart goes to the lungs through the pulmonary arteries
c) The pleura is associated with the liver
d) none of the above

77) A common feature of the trachea
of insects and that of mammals
is that both

a) have non-collapsible walls
b) have cartilaginous rings
c) are endodermal in origin
d) are ectodermal in origin

78) Which of the following is
the respiratory organ of the scorpion?

a) Lungs
b) Book lungs
c) Gills
d) Ctenidia

79) The site of glycolysis in
a cell is the

a) cytoplasm
b) chloroplast
c) chromosome
d) nucleus

80) The respiratory centre,
which regulates respiration,
is located in the

a) cerebral peduncle
b) vagus nerve
c) cerebellum
d) medulla oblongata

81) The respiratory pigment
haemocyanin is present in

a) Insects
b) Lobsters
c) Bivalves
d) Polychaetes

82) Respiration is
a) an anabolic process
b) a catabolic process
c) a chemical process
d) all these

83) In mammals, carbon dioxide
is transported from tissues
to the respiratory surface by

a) plasma only
b) R.B.C
c) W.B.C
d) Both a and b

84) In Glycolysis
a) glucose is converted to pyruvic acid
b) pyruvic acid is converted to glucose
c) pyruvate kinase makes ADP from ATP
d) glucose and pyruvic acid are used to produce ATP

85) The energy yield as a result
of total oxidation of one
molecule of glucose during cellular respiration in eukaryotes is

a) 30 molecules of ADP to 30 molecules of ATP
b) 32 molecules of ADP to 32 molecules of ATP
c) 36 molecules of ADP to 36 molecules of ATP
d) 38 molecules of ADP to 38 molecules of ATP

86) The double membrane sac called the
pleura encloses the

a) heart
b) lungs
c) kidney
d) all the above

87) Electron transport occurs

a) hormones
b) enzymes
c) phytochromes
d) cytochromes

88) Anaerobic respiration after
glycolysis is also called

a) fragmentation
b) restoration
c) multiplication
d) fermentation

89) How much energy is released
in the breakdown of the last bond
of ATP?

a) 7.5 kcal
b) 15 kcal
c) 60 kcal
d) 75 kcal

90) Evolution of carbon dioxide is more than the intake of oxygen when
a) sucrose is respired
b) glucose is respired
c) organic acids are respired
d) none

91) The larynx is also called the
a) glottis
b) epiglottis
c) voice box
d) vocal cords

92) When taken out of water
fishes die because

a) they get too much oxygen
b) their body temperature rises very high
c) they are unable to respire
d) they are unable to take in water

93) The respiratory organs of
crustaceans are

a) trachea
b) book lungs
c) gills
d) lungs

94) During hibernation frogs
respire through their

a) skin only
b) lungs only
c) both
d) none

95) A labourer engaged in
road-building work requires
daily about

a) 4,500 calories
b) 3,000 calories
c) 2,000 calories
d) 10,000 calories

96) Glycogenolysis is the
process in which

a) glycogen is converted into glucose
b) glucose is converted into glycogen
c) glucose is oxidised to yield ATP
d) amino acids are broken down to yield glucose

97) The inner folds of a
cell organelle which is
concerned with the production of ATP are

a) cisternae
b) vesicles
c) lamellae
d) cristae

cycle begins with

a) lysine
b) glycogen
c) pyruvic acid
d) HCI

99) The most common source
of energy is

a) AMP
b) ATP
c) ADP
d) PPP

100) The right lung of the rabbit

a) 2 lobes
b) 4 lobes
c) one lobe
d) 5 lobes


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