Biology
Diversity-In-The-Living-World
Easy
Question
Which of the following cells are round and biconcave in shape?
- White blood cells
- Red blood cells
- Columnar epithelial cells
- 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 
transfer) and allows easy squeezability of the Red blood cells (RBC's) through the blood vessels.
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