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Inside a chloroplast, a stack of disc-shaped thylakoid sacs is called a
Agranum
Bcristae
Cstroma
Dmatrix
Answer & Solution
Correct answer: A. granum
A stack of thylakoids in a chloroplast is called a granum (plural: grana). Light reactions of photosynthesis happen on thylakoid membranes; the surrounding stroma is where carbon fixation runs.
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