The least consistency of shape is exhibited by ..............

Options

A. white blood cells
B. blood platelets
C. epithelial cells
D. red blood cells

Answer

To solve the question "The least consistency of shape is exhibited by ..............", we will analyze the options provided: white blood cells, blood platelets, epithelial cells, and red blood cells.

### Step-by-Step Solution:

1. **Understanding Red Blood Cells (RBCs)**:
- Red blood cells are typically biconcave discs. This shape is consistent and allows for efficient gas exchange. They do not change shape significantly.
- **Conclusion**: RBCs have a consistent shape.

2. **Analyzing White Blood Cells (WBCs)**:
- White blood cells are known for their ability to change shape. They can be rounded or irregular and can undergo amoeboid movement, which allows them to squeeze through capillaries and move towards infection sites.
- **Conclusion**: WBCs exhibit the least consistency of shape due to their ability to change form.

3. **Examining Blood Platelets**:
- Blood platelets are small, disc-shaped bodies that can be round or oval. While they can change slightly in shape, their overall structure is more consistent than that of white blood cells.
- **Conclusion**: Blood platelets have a relatively consistent shape.

4. **Looking at Epithelial Cells**:
- Epithelial cells come in various shapes (squamous, cuboidal, columnar) depending on their location in the body. However, each type has a consistent shape within its category.
- **Conclusion**: Epithelial cells have consistent shapes based on their type.

5. **Final Decision**:
- Among all the options, white blood cells are the only ones that can change shape significantly and frequently, making them the cells with the least consistency of shape.
- Therefore, the answer is **white blood cells**.

### Final Answer:
The least consistency of shape is exhibited by **white blood cells**.