chloroplast


chloroplast

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Internal structures of the chloroplast—© Merriam-Webster Inc.

Microscopic, ellipsoidal organelle in a green plant cell. It is the site of photosynthesis. It is distinguished by its green colour, caused by the presence of chlorophyll. It contains disk-shaped structures called thylakoids that make possible the formation of ATP, an energy-rich storage compound.

This entry comes from Encyclopædia Britannica Concise.
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