(C) Thylakoids are flattened, sac-like membranous structures found inside the $Chloroplast$. They are organized into stacks called $grana$ (singular:

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(C) Thylakoids are flattened, sac-like membranous structures found inside the $Chloroplast$. They are organized into stacks called $grana$ (singular: $granum$). Thylakoids contain chlorophyll pigments and are the sites where the light-dependent reactions of photosynthesis occur.