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Photosynthetic chemical reactions occur in organelles called
mitochondria.
• ribosomes.
• chloroplasts.
• cytoplasms.

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Chloroplasts.

Reason: Photosynthesis occurs in chloroplasts (they contain chlorophyll and thylakoid membranes for the light reactions and stroma for the Calvin cycle). Mitochondria do cellular respiration, ribosomes make proteins, and the cytoplasm hosts other metabolic processes.