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  9. Q91

OPSC OCS 2019 · Question 91 of 99

Human blood is red in color because of the presence of :

General Studies

  1. AHaemoglobin in red blood cellsCorrect
  2. BHaemoglobin in plasma
  3. Cthe presence of hemocyanin in RBC
  4. DHaemosiderin plasma

Answer: A. Haemoglobin in red blood cells

Explanation

The blood's red color is due to the spectral properties of the hemic iron ions in hemoglobin. Each hemoglobin molecule carries four heme groups; hemoglobin constitutes about a third of the total cell volume.

Source: OPSC OCS Prelims 2019 GS Paper-I; answers per hemunda.com unofficial key

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