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A stack of thylakoids is called a:

AStoma
BGranum
CStroma
DLumen
Answer & Solution
Correct answer: B. Granum
1. Grana are the plural. 2. Each stack is a granum. 3. Stroma surrounds the grana. _Source: OpenStax Biology 2e, Chapter 8, Photosynthesis (CC BY 4.0)._
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