Question

3. What are the principles of cell theory? ​

Answer 1

Answer:

The Cell Theory Is a Unifying Principle of Biology

The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.

The cell theory was given by Schleiden and Schwann, which was later modified by Rudolf Virchow. The three principles of cell theory are:

All living organisms are composed of one or more cells.

Cell is the basic structural and functional unit of living organisms.

All cells arise from pre-existing cells.

All the living organisms, be it bacteria or complex multicellular organisms, all are made up of cells. The basic chemical composition of cells remains the same with some differences in the structure of prokaryotic and eukaryotic cells and plants and animal cells.

In prokaryotes such as bacteria and unicellular eukaryotes like an amoeba, etc. a single cell performs all the functions essential for life. In multicellular organisms, there occurs division of labour and cells are specialised to carry out different functions.

A single-cell zygote gives rise to complex multicellular organisms. Cells carry all the genetic information, which is passed on to the offspring at the time of cell division.

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Answer 2

The cell theory is given by Schleiden and Schwann, which was later modified by Rudolf Virchow.

The three principles of cell theory are:

• All living organisms are composed of one or more cells.

• Cell is the basic structural and functional unit of living organisms.

• All cells arise from pre-existing cells.