1996 General Studies, all questions

UPSC Prelims 1996 · General Studies

Question 104: Science and Technology

Living organisms require at least 27 elements, of which 15 are metals. Among these, those required in major quantities include

aPotassium, Manganese, Molybdenum & Calcium
bPotassium, Molybdenum, Copper & Calcium
cPotassium, Sodium, Magnesium & Calcium
dSodium, Magnesium, Copper & Manganese

AnswerThe answer is (c).

Sodium, potassium, calcium and magnesium are the metals needed in bulk (the macro-minerals) by living organisms. Manganese, molybdenum and copper are trace elements, needed only in very small amounts. Remember: major metals - Na, K, Ca, Mg; trace metals - Fe, Mn, Mo, Cu, Zn.

Why each option is right or wrong
  • (a) Manganese and molybdenum are trace elements, needed in tiny amounts.
  • (b) Molybdenum and copper are trace elements.
  • (c) Right: potassium, sodium, magnesium and calcium are needed in major quantities.
  • (d) Copper and manganese are trace elements.

Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 1996, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.