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In this article we will discuss about the structure of chloroplast. This will help you to draw the structure and diagram of chloroplast. 
1. Chloroplasts (Figs. 295-296), responsible for the photosynthesis of the plants, are the characteristic features of the cells of green plants.
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2. Around the chloroplast is present a double membrane envelope.
3. Each membrane of chloroplasst is 35 to 50 Å thick.
4. Many dark-coloured grana are present. These are interconnected by means of photosynthetic lamellae or thylakoids.
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5. A colourless matrix or stroma is present in the chloroplast.
6. There are present some interconnecting interregnal projections called frets.
7. Park and Biggins (1964) have observed some sphere like structures within the membrane component of the granular disc. These are called quantasomes.
8. Quantasomes are structural and functional units of chloroplast. About 250 chlorophyll molecules are present in a quantasome.
