Cell is the basic unit of life . It is discovered by Robert Hooke in 1665 , while examining a thin slice of cork through a self designed microscope . Cell is a Latin word for 'a little room' . With the help of improved microscope 'Leewenhoek' in 1674 discovered free living cells in pond water . Cell theory was given by two biologists , Scheleiden and Schwann . According to this theory ,  a) All the plants and animals are composed of cells . b) The cell is the basic unit of life . A typical eukaryotic cell has three major parts : a) Plasma membrane b) A nucleus , c) Cytoplasm with all the cell organelles  Plasma membrane forms the outermost boundary of cytoplasm . It gives definite shape to the cell . Nucleus is the largest cell organelle . It has a double layered covering called nuclear membrane . The nucleus carries genetic information and it is transferred from parent and daughter cells . Cytoplasm is the fluid content inside the plasma membrane . It contains many cell organelles . Each of these organelles performs a specific function for the cell . Cell organelles present in cytoplasm are (i) Endoplasmic Reticulum , (ii) Mitochondria , (iii) Golgi Apparatus , (iv) Lysosomes , (v) Plastids , (vi) Vacuoles . Some of the organelles are present in large number in cell . Eg : Cells involved in photosynthesis may contain 50 - 200 chloroplasts .Cell.well cell is basic and fundamental unit of our life .It contains many organelles which have particular function s.