Plastids are small bodies found free in most plant cells. These are found absent in fungi, certain bacteria, algae and multicellular animals. The plastids can be categorized to :
Chromoplasts : Coloured (other than green) plastids.
Chloroplasts : Green coloured plastids :
Leucoplasts : Colourless plastids.
All these three are double membrane bound structures which are mainly used for trapping radiation and storage purposes.
New plastids arise from proplastids by a fission like process.
A cell is derived as the functional and structural unit of life. Every cell is surrounded by a cell membrane that dissects the external and internal environments of the cell. The interior environment of a cell is called the cytoplasm.
It carries cellular machinery and structural elements. The nucleus is present in the center of the cell, which includes all the hereditary information of an organism. Some of the molecules present in the cell are protein, carbohydrates, starch, and sugar.