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GS Paper IUPSC Prelims 1996
Health & Medicine
Question No. 343Interactive Test Mode
00:00
+2-0.66

Q343. Which one of the following is not an essential micronutrient for plants?

Which one of the following is not an essential micronutrient for plants?

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 1996 • Science and Technology

Correct Answer: Option (C) — Sodium

Concept & Option Breakdown

Standard Reference Verified

Essential plant micronutrients required in trace quantities include Iron ($Fe$), Manganese ($Mn$), Zinc ($Zn$), Copper ($Cu$), Boron ($B$), Molybdenum ($Mo$), Chlorine ($Cl$), and Nickel ($Ni$). Sodium ($Na$) is generally non-essential for most higher plants, though it can act as a beneficial element in certain halophytes and $C_4$ plants.

Elimination Heuristic & Exam Approach

Standard NCERT plant physiology lists 8 essential micronutrients: Fe, Mn, Cu, Mo, Zn, B, Cl, Ni. Sodium is not on the universal essential list.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1996 (Q343)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — Sodium

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Frequently Asked Questions — UPSC Prelims 1996 Q343

What is the official answer for UPSC Prelims 1996 GS Paper I Question 343 (Science and Technology)?

The official UPSC answer key for this 1996 Science and Technology (Health & Medicine) question is Option (C): "Sodium". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1996 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Standard NCERT plant physiology lists 8 essential micronutrients: Fe, Mn, Cu, Mo, Zn, B, Cl, Ni. Sodium is not on the universal essential list.

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