Question

State the cell theory as proposed by Schleiden and Schwann ?

Answer 1

Hint: Matthias Schleiden and Theodor Schwann were German scientists and co-founder of cell theory. Both of them worked on the cells differently and later on together gave three postulates of cell theory.

Complete answer:
The cell is habitually addressed as the structural, functional, and developmental unit of life. The three postulates of cell theory as proposed by Schleiden and Schwann are:
- All plants and animals are made of cells.
- Cells possess all the attributes of life (assimilation, growth, reproduction) or it is life’s fundamental unit.
- All cells arise from the division of pre-existing cells
Additional Information:
This cell theory is the basis of the modern-day cell theory. The modern tenets of the Cell Theory include: 
- Each and every living thing are made up of cells.
- The chemical composition of all the cells is almost the same.
- A cell is a functional unit of all living things.
- All cells arise from the division of pre-existing cells.
- All energy flow of life occurs within cells.   
- During cell division hereditary information is passed from one generation to another 

Note:
- Robert Hooke coined the term ‘Cell’ in 1663.
- Robert Brown reported the discovery of the nucleus in 1833.