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GS Paper IUPSC Prelims 2002
Health & Medicine
Question No. 467Interactive Test Mode
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Q467. With reference to the blood in a normal person, which one of the following statements is correct?

With reference to the blood in a normal person, which one of the following statements is correct?

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 2002 • Science and Technology

Correct Answer: Option (D) — The blood has more platelets than WBC

Concept & Option Breakdown

Standard Reference Verified

• Option (d) is correct: In normal human blood, platelets range from 150,000 to 450,000 per µL, whereas WBC count is about 4,000 to 11,000 per µL. Thus, platelets outnumber WBCs significantly. • Option (a) is incorrect: Veins hold about 65–70% of the total blood volume at rest (capacitance vessels). • Option (b) is incorrect: Formed elements (blood cells) make up ~45% of total blood volume; plasma makes up ~55%. • Option (c) is incorrect: WBCs are produced primarily in the bone marrow, with certain types maturing in lymphoid organs.

Elimination Heuristic & Exam Approach

Abundance order of blood components: RBCs (~5 million/µL) > Platelets (~1.5–4.5 lakh/µL) > WBCs (~4,000–11,000/µL).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2002 (Q467)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — The blood has more platelets than WBC

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Frequently Asked Questions — UPSC Prelims 2002 Q467

What is the official answer for UPSC Prelims 2002 GS Paper I Question 467 (Science and Technology)?

The official UPSC answer key for this 2002 Science and Technology (Health & Medicine) question is Option (D): "The blood has more platelets than WBC". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2002 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?

Abundance order of blood components: RBCs (~5 million/µL) > Platelets (~1.5–4.5 lakh/µL) > WBCs (~4,000–11,000/µL).

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