Biology
Diversity-In-The-Living-World
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Question

Which of the following cells are round and biconcave in shape?

  1. White blood cells    
  2. Red blood cells    
  3. Columnar epithelial cells    
  4. Nerve cells    

The correct answer is: Red blood cells


    Red blood cells (RBC's) or erythrocytes are the most abundant of all the cells in blood. They are devoid of nucleus in most of the mammals and are round or biconcave in shape. It is biconcave because such a shape has increase surface area (for O subscript 2 end subscripttransfer) and allows easy squeezability of the Red blood cells (RBC's) through the blood vessels.

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