Generally Plastids are known as Kitchen of the cell . But, there are three types of cells. they are:
1.Chloroplast
2.Chromoplast
3.Leucoplast
Chloroplast is a plastid containing green pigment called chlorophyll.
This pigment helps the cells to prepare its own food by the process of photosynthesis.
So thats why Chloroplast is the cell organelle which is known as Kitchen of the cell.