Answer will be d) part because chloroplast are the site ofphotosynthesis. They contains chlorophyl which is necessary forphotosynthesis and photosynthesis is the process by which plants make their food. So, plastids are called as kitchen of the cell.

Plastids in a Cell
Plastids are double-membraned organelles found in the cells of plants and algae. They are responsible for various functions within the cell, including the synthesis and storage of food molecules.

Kitchen of the Cell
The kitchen of the cell is a term used to describe the plastids within a plant cell. Plastids are often referred to as the kitchen of the cell because they are involved in the process of photosynthesis, which is how plants produce their own food.

Functions of Plastids
Plastids have various functions within the cell, including:
- Photosynthesis: Plastids contain chlorophyll, a pigment that captures light energy for photosynthesis.
- Storage: Plastids can store various molecules such as starch, lipids, and proteins.
- Pigment synthesis: Some plastids, like chromoplasts, are responsible for producing and storing pigments that give plants their color.

Types of Plastids
There are different types of plastids in plant cells, each with its own specialized functions:
- Chloroplasts: Responsible for photosynthesis and contain chlorophyll.
- Chromoplasts: Store pigments that give fruits and flowers their color.
- Leucoplasts: Involved in the synthesis and storage of starch, oils, and proteins.
In conclusion, plastids are the kitchen of the cell because they are essential for the production of food molecules through photosynthesis and the storage of nutrients in plant cells.