10th Class Biology Solved MCQS
Amount of carbon dioxide in inspired air is:
16%
0.04%
4%
None of these
In first stem of glycolysis glucose molecules breaks ans divide into two _______ molecules
Lactic acid
Formic acid
Pyruvic acid
Citric acid
The major cause of lungs cancer is:
viral infection
nicotine
smoking
radiation
How many carciogens are present in cigarette smoke?
60
40
70
50
In man the system of gaseous exchange is:
excretory system
respiratory system
nervous system
digestive system
What happens during Exhalation?
All of these
Diaphragm become dome shaped
Ribs muscles relax
Pressure on lungs increased
How many pairs of ribs in humans?
26
30
12
24
Which bring deoxygenated blood form heart into lungs?
Aorta
Pulmonary veins
Wind Pipe
Pulmonary Artery
The respiratory centre is present in :
Brain
Muscles
Lungs
Nose
A disease involving the breakdown of air sacs of the lungs is:
Bronchitis
asthma
pneumonia
emphysemsa
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