Question

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

• A. centimeter
• B. millimeter
• C. micrometer
• D. meter

Answer 1

The correct option is C

micrometer

The correct option is option C.

Explanation of the correct option:

1. The cell is the structural and functional unit of life.
2. The body of living organisms is made of cells.
3. The body of living organisms can be unicellular or multicellular.
4. Each cell varies greatly in size, shape, and activities.
5. The size of the cell is measured in micrometers.
6. The smallest cell Mycoplasma is 0.3 micrometers and red blood cells of humans are 7.0 micrometers in diameter.
7. The normal animal cell varies from 10-30 micrometers and plant: cells vary from 10-100 micrometers.

Explanation of the incorrect options:

Option A:

The unit of length is a centimeter, which is used to measure plant height.

Option B:

The metric unit of length is millimeters, not used for measuring cell size.

Option D:

The unit of length is meters, not used for measuring cell size.

Final Answer: the unit of measurement used for expressing the dimension (size) of cells is micrometer.