11th class (FSc) Biology Unit 13 MCQs
51. Breathing rate in man at rest is:
a. 20-25 times/min
b. 0.1-15 times/min
c. 25-30 times/min
d. 15-20 times/min
52. When oxygen saturation is 100 mm of mercury then hemoglobin saturation is:
a. 78%
b. 100%
c. 68%
d. 98%
53. Hemoglobin in man increases the oxygen carrying capacity of the blood to about:
a. 60 times
b. 75 times
c. 100 times
d. 50 times
54. About 70% CO2 is carried as:
a. Bicarbonate ion
b. CO2
c. Carbonate ion
d. Carboxy haemoglobin
55. Breakdown of alveoli of lungs is called:
a. Tuberculosis
b. Asthma
c. Lungs cancer
d. Emphysema
56. Haem portion of haemoglobin contain:
a. Fe+++
b. Mg++
c. Ca++
d. Fe++
57. The volume of air taken inside the lungs and expelled during exercise is about:
a. 1.5 liters
b. 2.5 liters
c. 4.5 liters
d. 3 .5 liters
58. When diving mammal dives the rate of heart beat slowdowns to:
a. One eighth
b. One fifth
c. One tenth
d. One sixth
59. More than ten compounds of tar of tobacco smoke are included in causing:
a. Asthma
b. Cancer
c. Emphysema
d. Tuberculosis
60. Asthma is associated with severe paroxysm of difficult:
a. Walking
b. Sleeping
c. Breathing
d. Speaking
61. Emphysema is a disease caused by the breakdown of:
a. Bronchi
b. Lungs
c. Alveoli
d. Trachea
62. Carbon dioxide per 100 ml of venous blood is:
a. 98 ml
b. 50 ml
c. 99 ml
d. 54 ml
63. 100 ml of arterial blood of human being contains CO2 (carbondioxide):
a. 56 ml
b. 50 ml
c. 58 ml
d. 54 ml
64. Plasma proteins carry about % CO2 from body fluids to lungs:
a. 4%
b. 1%
c. 5%
d. 2%
65. Myoglobin occurs in:
a. Plasma
b. Red blood cells
c. Muscle fibers
d. White blood cells
66. In human beings, the respiratory pigment is:
a. Haemoglobin
b. Myoglobin
c. Haemocyanin
d. Bilirubin
67. Emphysema is the breakdown of:
a. Teeth
b. Haemogloin
c. Tissue
d. Alveoli
68. ……… is more important regulator of breathing process:
a. Hemoglobin
b. Oxygen
c. Myoglobin
d. Carbon dioxide
69. Exhaled air contain CO2:
a. 4%
b. 0.04%
c. 5%
d. 4%
70. Tuberculosis is the disorder of:
a. Excretory system
b. Digestive system
c. Respiratory system
d. Circulatory system
71. entage of carbon dioxide carried in the form of bicarbonate in plasma is:
a. 75
b. 65
c. 80
d. 70
72. The normal alveolar ventilation is regulated by:
a. Iron
b. Haemoglobin
c. Carbon dioxide
d. Oxygen
73. The total lungs capacity for air is:
a. Four litters
b. Two litters
c. Five litters
d. Three litters
74. Why hemoglobin is 98% saturated, the oxygen content per 100ml of blood is:
a. 7.6ml
b. 19.6ml
c. 16.6ml
d. 18.6ml
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