Question

State the cell theory as understood today

Answer 1

The cell theory states three major points :-
●The cell is the smallest unit of structure of all living things.
●The cell is the unit of function of all living things.
●All cells arise from pre-existing cells.



To understand it better we can take the example of a plant such as mango and an animal such as a frog.
●Structural Unit:-
If we take any part of the body of a frog or any part of a mango plant and examine it under a microscope, it will show a cellular structure.

●Functional Unit:-
Any function in the body of the frog or in the mango plant is due to the activity in its cells.

●Cells die and are replaced :-
The body of the frog, or of the mango tree, is composed of millions and millions of cells. Many of these cells continuously die and are replaced by new ones which are formed by the division of younger cells. Formation of cells from pre-existing cells is a never-ending chain.

●All life starts as a single cell:-
The life of the frog and the life of the mango tree started as an egg and as a seed respectively.



HOPE THIS HELPS!

Answer 2

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1. The cell is the smallest unit of structure of all living things.
2. The cell is the unit of function of all living things.
3. All cells arise from pre-existing cells.

Extra information -

• Structural unit - If we take any part of the body of a frog or any part of a mango plant and examine it under a microscope, it will show a cellular structure.

• Functional Unit - Any function in the body of the frog or in the mango plant is due to the activity in its cells.

• Cells die and are replaced - The body of the frog for the mango tree is composed of millions and millions of cells. Many of these cells continuously die and replaced by new ones which are formed by the division of younger cells.

• All life starts as a single cell - The life of the frog and the life of the mango tree started as a fertilized egg and a seed respectively.