In Camels, erythrocytes are

The correct option is oval and nucleated.

Erythrocytes, commonly known as red blood cells (RBCs), are responsible for transporting oxygen throughout the body. In the vast majority of mammals, mature red blood cells are circular, biconcave, and lack a nucleus (non-nucleated) to maximize the space available for hemoglobin.
However, camels (family Camelidae) are a notable exception to this general rule. The red blood cells of camels are uniquely adapted to help them survive in harsh, arid desert environments.

Here is why camel erythrocytes are oval and nucleated:

1. Oval Shape:
The oval (ellipsoid) shape of camel RBCs allows them to continue circulating smoothly through blood vessels even when the camel is severely dehydrated and its blood becomes highly viscous. Furthermore, this shape allows the cells to expand significantly (up to 240% of their original volume) without bursting when the camel drinks large quantities of water rapidly.

2. Nucleated Structure:
Unlike typical mammalian erythrocytes that lose their nucleus during maturation, camel erythrocytes retain their nucleus. The presence of a nucleus provides structural support and stability, helping the cells withstand osmotic pressure changes and physical stress during cycles of dehydration and rehydration.