Living organisms are composed of fundamental units called cells. This understanding stems from various observations and experiments, one of which involves examining the structure of an onion peel under a microscope. Through such activities, we can explore the basic building blocks of life

Discovery and Observation of Cells

1.Microscopic Examination: By using a microscope, one can observe that an onion peel consists of many small, similar structures. These structures are cells, the basic units of life.

2.Cell Uniformity: Cells from different sizes of onion bulbs look similar under the microscope, indicating that cells are consistent in structure regardless of the size of the organism they come from.

Types of Organisms Based on Cellular Structure

Unicellular Organisms

Definition: Organisms made up of a single cell.