Question

what is cell? explain?

Answer 1

The cell is the structural and functional unit of life. All cell play their specific role. And cell is known as structural and functional unit of life.

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Answer 2

$\boxed{Question}$

$\textbf{What is Cell? explain?}$

$\boxed{Answer}$

→ Cells are the structural​ and functional​ unit of life of living organisms.

All living organisms are made up of cell. That's why cell is known as structural unit of life.

A single cell can perform all life functions with the help of it's components. Therefore it is known as functional unit of life.

→ Robert Hooke first discovered the cell in 1665. 

He prepared a thin slice of cork and observed it under self made microscope. He saw some box like structures which he named as cell.

→ Anton Von Leeuwenhoek first saw the living cell and also first describe the living cell. 

→ Cells can replicate independently.

→ It contain hereditary information due to presence of nucleus or nucleoid.

→ All organisms are made up of cells. Organisms with single cells are known as unicellular organisms. And organisms with multiple cells are known as multicellular organisms. 

→ Cells size ranges from 1 - 100 μm.

→ Mycoplasmas, is the shortest cell (0.3 μm) and ostrich egg and nerve cells are the largest cell. 

→ Cells are in different shapes. Their shape vary with their function. They may be cuboid, thread like, disc like etc.
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→ Cells are of two types namely; Eukaryotic and Prokayotic cells.

a) Eukaryotic cells :- 

* These are generally large in size.

* Nuclear region is well defined and surrounded by a nuclear membrane.

* Member bound cell organelles are present such as mitochondria, endoplasmic reticulum, golgi appartus etc.

* DNA is linear.

* Cell divides by binary fission and budding.

* Ex :- Human beings, plants etc.

b) Prokayotic cells :-

* These are smaller in size.

* Nuclear region is not well defined and not surrounded by a nuclear membrane.

* Membrane bound cell organelles are absent such as mitochondria, endoplasmic reticulum, golgi appartus etc.

* DNA is circular.

* Cell divides by mitosis and meiosis.

* Ex :- Bacteria, blue-green algae etc.
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‡ Animal Cell :-

* Cell wall absent.

* Centrosome present.

* Vacuoles are small and many.

‡ Plant Cell :-

* Cell wall present.

* Centrosome absent.

* Vacuole is large and single.
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