A CELL-AND ITS ORGANELLES
Every living organism is made up of small basic units called 'cell'. A cell is called as a basic structural and functional unit of an organism. The cells are the building blocks of a body. The size of a cell is very very small starting from 0.5 microns to 1 micron . The smallest cell is a bacterial cell which is 0.5 micron whereas the biggest cell is an ostrich egg cell which is 18cm×17cm. Every cell has its own particular structures called organelles which are very very important because each carry out their own specific function. A typical cell consists of the following organelles: NUCLEUS: The central dark black color spot present in the cell is called nucleus. It is also called as "CONTROL ROOM OF THE CELL". It has all genetic material which can be either DNA or RNA . This genetic material is responsible for passing the characters from parents to children. The nucleus is also involved in cell division. CYTOPLASM: The fluid present inside the cell which holds