UPSC Prelims 2008 · General Studies

Question 132: Science and Technology

Assertion (A): In human body, liver has an important role in fat digestion. Reason (R): Liver produces two important fat-digesting enzymes.

aBoth A and R are individually true and R is the correct explanation of A

bBoth A and R are individually true but R is not the correct explanation of A

cA is true but R is false

dA is false but R is true

AnswerThe answer is (c).

The assertion is true: the liver helps digest fat by making bile, which breaks fats into tiny droplets so that enzymes can act on them. The reason is false: the liver makes bile but no fat-digesting enzymes, since bile contains bile salts, not enzymes. Fat-digesting lipase comes from the pancreas and the walls of the small intestine.

A. The liver aids fat digestion by making bile.
R. The liver makes bile, not fat-digesting enzymes; lipase comes from the pancreas and intestine.

How you could have got this

If you were sure statement 1 is correct, (d) goes. Then judge the second statement; if it is correct too, decide whether it explains the first.

This follows an unofficial answer: UPSC has not published its key for this year, and if that answer is wrong, so is this path.

Which options go is worked out from UPSC’s key and the options, not by a model.

Why each option is right or wrong

(a) R is false, so it cannot be the correct explanation of A.
(b) R is false, so both cannot be individually true.
(c) A is true and R is false.
(d) A is true, so it cannot be false.

Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2008, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.