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2015-09-09T20:34:35+05:30

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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 .
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2015-09-09T22:32:59+05:30

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Cell is the basic structural and functional unit of life.
cell orgenelles are different tint part of cell that are suspended in cytoplasm and perform different functions.like mitochondria. libosomes, nucleus. ribosomes etc.
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