UPSC Prelims 2005 · General Studies

Question 85: Science and Technology

Assertion (A): All the proteins in our food are digested in small intestine only. Reason (R): The protein-digesting enzymes from pancreas are released into small intestine.

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 (d).

Protein digestion begins in the stomach, where pepsin acts in the acid medium, and finishes in the small intestine, so A is false. R is true: the pancreas releases trypsin and chymotrypsin into the small intestine, but that does not make A correct. Remember: pepsin in the stomach, trypsin in the intestine.

A. Pepsin begins protein digestion in the stomach.
R. Pancreatic trypsin and chymotrypsin act in the small intestine.

How you could have got this

If you were sure statement 1 is not correct, only (d) is left: every other option says it is correct.

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) A is false, since digestion starts in the stomach.
(b) A is false.
(c) A is false, and R is true.
(d) Correct: A is false, R is true.

Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2005, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.