The unit of measurement used for expressing dimension (size) of cell is

Options

A. centimetre
B. millimetre
C. micrometre
D. metre

Explanation

To determine the unit of measurement used for expressing the dimensions (size) of a cell, we can follow these steps:

### Step 1: Understand the Size of Cells
Cells are generally very small and cannot be measured effectively using larger units like centimeters or meters.

### Step 2: Identify Common Cell Sizes
- The size of an animal cell typically ranges from about 10 to 30 micrometers (µm).
- The size of a plant cell can range from about 10 to 100 micrometers (µm).

### Step 3: Evaluate the Options
Given the options:
- Centimeter (cm)
- Millimeter (mm)
- Micrometer (µm)
- Meter (m)

We need to consider which of these units is appropriate for measuring the small size of cells.

### Step 4: Choose the Correct Unit
Since the sizes of cells are in the range of micrometers, the most suitable unit for expressing the dimensions of cells is the micrometer (µm).

### Final Answer
The unit of measurement used for expressing the dimension (size) of a cell is **micrometer (µm)**.

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