Question

The unit of measurement used for expressing dimension (size) of
cells is:
(a) centimeter (c) micrometer
(b) millimeter (d) metre


NCERT Class VIII
Science - Exemplar Problems

Chapter 8. Cell - Structure and Functions

Answer 1

Q-1=The unit of measurement used for expressing dimension (size) of
cells is:
(a) centimeter (c) micrometer
(b) millimeter (d) metre

Answer=[C]Micrometer

Answer 2

Answer: correct option is c which is a micrometer

Explanation:

• The cell is the structural and functional unit of life.
• The body of living organisms consists of cells.
• The body of living organisms can be unicellular or multicellular.
• Each cell varies greatly in size, shape, and activities.
• Cell size is measured in micrometers.
• The smallest Mycoplasma cell is 0.3 micrometers and human red blood cells are 7.0 micrometers in diameter.
• A normal animal cell ranges from 10-30 micrometers and plant: cells vary from 10-100 micrometers.

We measure the substance using such parameters so that the calculations are not lengthy. Thus, cells are measured in micrometers because their size lies within this range. However, you can always convert one unit to another using simple calculations.

Most plant and animal cells are only visible under a light microscope with dimensions between 1 and 100 micrometers. The unit for measuring cell size is microns.

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