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State PCS PYQPrelims 2021

UPPCS · Question 38

'Blue baby syndrome' is due to the presence of which of the following in the blood?

  1. Haemoglobin
  2. Methemoglobin
  3. Lead
  4. Nitrate
Show answer & explanation

Answer: (B) Methemoglobin

Explanation

Blue baby syndrome (methaemoglobinaemia) is due to methaemoglobin in the blood, which cannot carry oxygen; nitrate in water is the usual trigger. (As per the official UPPSC answer key.)