The Red Colour of R. B. Cs is due to–

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(d) Haemoglobin — Haemoglobin (Hb or Hgb ) is an iron- containing protein present in erythrocytes or Red blood cells (RBC) of almost all vertebrates. Each haemoglobin is made up of 4 subunits, 2 alpha subunits and 2 beta subunits. Each subunit surrounds the central heme group that contains iron and binds to one oxygen molecule. The blood cells are red due to the interaction between iron and oxygen. Hence, the red colour of the red blood cells is due to the presence of haemoglobin.

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(A) Cutin

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(B) Chlorophyll

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(C) Haemocyanin

The Red Colour of R. B. Cs is due to–

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