UPSC Prelims 1997 · General Studies

Question 128: Science and Technology

Match List I with List II and select the correct answer by using the codes given below the lists: List I I. Malaria II. Filaria III. Encephalitis IV. Leukaemia List II A) Bone marrow B) Brain C) Muscle D) Lymph node E) Blood cells

aI-E, II-C, III-B, IV-A

bI-E, II-D, III-B, IV-A

cI-D, II-C, III-E, IV-A

dI-E, II-D, III-A, IV-B

AnswerThe answer is (b).

Malaria parasites live in red blood cells. Filaria worms live in the lymphatic system and block lymph nodes and vessels, causing swelling (elephantiasis). Encephalitis is inflammation of the brain, and leukaemia is a cancer of blood-forming tissue in the bone marrow.

I. I-E: malaria parasites infect the blood cells.
II. II-D: filaria worms lodge in the lymph nodes.
III. III-B: encephalitis is inflammation of the brain.
IV. IV-A: leukaemia arises in the bone marrow.

Why each option is right or wrong

(a) II-C is wrong: filaria affects the lymph nodes, not muscle.
(b) Right: malaria-blood cells, filaria-lymph node, encephalitis-brain, leukaemia-bone marrow.
(c) I-D, II-C and III-E are wrong; only IV-A is right.
(d) III-A and IV-B swap the brain and the bone marrow.

Explanation: written by UPSC Grade, not by UPSC.

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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.