1997 General Studies, all questions
UPSC Prelims 1997 · General Studies
Question 118: Science and Technology
Oxygen transportation in a human body takes place through I. Blood II. Lungs III. Tissue The correct sequence of transportation is
aI, II, III
bIII, I, II
cII, I, III
dI, III, II
AnswerThe answer is (c).
Oxygen from the air enters the blood in the lungs, is carried by the blood (bound to haemoglobin in red cells) around the body, and is then delivered to the tissues. So the sequence is lungs, blood, tissues: II, I, III.
Why each option is right or wrong
- (a) Puts blood before the lungs, but oxygen enters the body at the lungs.
- (b) Starts with the tissues, where oxygen is used and not taken in.
- (c) Right: lungs, blood, tissues.
- (d) Puts the tissues before the lungs, which reverses the path.
Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 1997, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.