Question

The smallest unit of life is the _____.
a. atom
b. molecule
c. cell
d. organism

Answer 1

Introduction: Biologists are continuously studying the exact concept of life. Living things are too diverse, consisting of the same essential components as non-living things. As per biologists' point of view, the life of living organisms is in increasingly inclusive levels of the organization.

Option c. is "cell". Biologists view life at increasing levels of the organization. The cell is the basic unit for structural and functional activities in a living organism. The "molecules of life" are together arranged to form an enclosure, which is the smallest unit of living organisms. Some cells can live and reproduce independently. Hence, option c. is correct.

Reasons for the incorrect answer:

Option a.  is "atom". The atom is the smallest fundamental unit of a substance. So, option a. is an incorrect answer.

Option b. is "molecule". Atoms join with another atom; they together form molecules. So, option b. is an incorrect answer.

Option d. is "organism". An organism is an individual that consists of one or more cells. So, option d. is an incorrect answer.

 

The smallest unit of life is the cell.