Cell- Unit Of Life

The cell is the structural and functional unit of life.
On the basis of variation of cell number, there are two types of organisms: unicellular organism and multiceullar organism.

Cell wall is made up of cellulose and it surrounds cell membrane. It is present in plant cell and absent in animal cell.

Cytoplasm is a jelly-like, semi-fluid, colourlessand translucent fluid which is present betweenthe cell membrane and the nucleus.

Protoplasm is a transparent, semi-fluid granular substance which contains cell organelles enclosed within cell membrane.

Cellmembrane regulates the entry and exit of substances in and out of the cell.

Nucleus contains the chromosomes, which carry genes. It helps in the transmission of characters from parents to their offspring.

One or more round shaped nucleoli is present inside the nucleus.

Mitochondria are double-walled structure. They release energy in the form of ATP and are called ‘power house of the cell’.

Plastids are living, double-walled structure with a proteinaceous matrix that occurs in plant cells only.

Golgi apparatus also called Golgi bodyare present as granules, filaments or rods.

Ribosomes arethe site of protein synthesis.

Endoplasmic Reticulum forms an interconnected network of tubules, vesicles and cisternae within the cells.

Cell inclusions are soluble and insoluble chemicals formed due to metabolic activities.

Lysosomes aresingle membrane bound structures which contain digestive enzymes.

There are two of types of organisms, namely; prokaryotes and eukaryotes.

In animals, reserve food is stored in the form of glycogen.In plants, reserve food is stored in the form of starch.

There are some differences between an animal and a plant cell. Plant cells consist of cell wall, plastids and large vacuoles which is absent in the case of animal cells.

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