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UPSC 2002: With reference to the blood in a normal person, which one of the following statements is correct?
(a)Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time
(b)Blood cells constitute about 70 % of the total volume of the blood
(c)White Blood Cells (WBC) are made by lymph nodes only
(d)The blood has more platelets than WBC
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Not attemptedCorrect Answer: (d) The blood has more platelets than WBC
Normal peripheral blood contains far more platelets (≈150 000 – 400 000 / µL) than white blood cells (≈4 000 – 11 000 / µL), making statement (d) correct. Veins are actually more numerous and act as capacitance vessels holding about 60-70 % of blood volume (contradicting option a); cells make up only ~45 % of blood volume (contradicting option b); and WBCs arise chiefly in bone marrow, not solely lymph nodes (contradicting option c). ([newsnetwork.mayoclinic.org](https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-q-and-a-what-causes-a-high-platelet-count/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2002 Science & Technology question?▼
The correct answer is option (d): The blood has more platelets than WBC. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2002, GS Paper 1, as Question 26. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.