Structural Organisation Of Cells

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Structural Organisation Of Cells

Cell Wall

Plant cells have another rigid outer covering called the cell wall.The cell wall lies outside the plama membrane and is mainly composed of cellulose.

Plasma Membrane

The outermost covering of the celll that seperates the contents of the cell from it's external environment.It allows the entry and exit of some materials in and out of the cell.

Vacuoles

Vacuoles are storage sacs for solid or liquid contents.In plants, vacuoles are full of cell sap and provide turgidity and rigidity to the cell.

Plastids

Plastids are only present in plant cells.These are organelles in which pigments and materials such as starch,oil,etc. are stored.

Nucleus

The darkly coloured, spherical structure near the centre of each cell is called the nucleus.The nucleus contains chromosomes which contain information for inheritence of features from parents to next generation in the form of DNA molecules.

Cytoplasm

The cytoplasm is the fluid content inside the plasma membrane.It also contains many specialised cell organelles.

Endoplasmic Reticulum

The endoplasmic reticulum is a large network of membrane-bound tubes and sheets. Its functions include production of proteins and the transportation of the manufactured proteins.It also manufactures lipids which are important for cell function.

Golgi Apparatus

The golgi apparatus consists of a system of membrane-bound vesicles arranged parallel to each other in packs called cisterns.Its functions include the storage,modification and packaging of products in vesicles.

Lysosomes

Lysosomes are a kind of waste disposal system of the cell.Lysosomes help keep the cell clean by digesting any foreign materials that enter the cell.

Mitochondria

Mitochondria are known as the powerhouses of the cell.The energy required for various chemical activities needed for life is released by the mitochondria in the form of ATP molecules