Notes Of :-
★The Fundamental Unit Of Life
Class:- 9th
Answers
Answer:
Cell
It is the structural and functional unit of life.
Cell is termed as the structural unit of life as it provides structure to our body.
Cell is termed as the structural unit of life as it provides structure to our body.Cell is considered as the functional unit of life as all the functions of the body take place at cell level.
Cell Theory:
Cell Theory:Cell theory states that:
Cell Theory:Cell theory states that:All living organisms are composed of cells.
Cell Theory:Cell theory states that:All living organisms are composed of cells.Cell is the fundamental unit of life.
Shape and Size of Cells
Shape and Size of CellsCells vary in shape and size. They may be oval, spherical, rectangular, spindle shaped, or totally irregular like the nerve cell.
Shape and Size of CellsCells vary in shape and size. They may be oval, spherical, rectangular, spindle shaped, or totally irregular like the nerve cell.The size of cell also varies in different organisms. Most of the cells are microscopic in size like red blood cells (RBC) while some cells are fairly large like nerve cells.
1. Prokaryotic cell
Prokaryotic cells are cells in which true nucleus is absent. They are primitive and incomplete cells. Prokaryotes are always unicellular organisms. For example, archaebacteria, bacteria, blue green algae are all prokaryotes.
2. Eukaryotic Cell
Eukaryobc cells are the cells in which true nucleus is present. They are advanced and complete cells. Eukaryotes include all living organisms (both unicellular and multicellular organisms) except bactera and blue green algae.