By Ajay Anand
The basic structural unit of a living organism is called cell. All living beings are made up of cells.
Robert Hooke coined the term cell in 1665.
Robert Hooke used a self-made microscope to observe cells.
Robert Hooke observed cells in a thin slice of cork. This figure shows how he saw those cells.
The cell is the basic structural and functional unit of life. All organisms are composed of cells.
All cells are produced by the division of preexisting cells.
All basic chemical and physiological functions are carried out by cells.
Living beings show a large variation in number of cells.
Large organisms; like humans, elephants, tiger, etc. are made up of trillions of cells. They are called multicellular
But small organisms, like amoeba and bacteria are made up of single cell. They are called unicellular
Cells show wide variations in terms of shape.
Cells can be round, cylindrical, spindle-shaped, star-shaped, irregular, etc.
|White Blood Cells||Irregular|
|RBCs||Round and Concave|
|Nerve Cell||Star with a tail|