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Dark reactions of photosynthesis occur in

1. Granal thylakoid membranes
2. Stromal lamella membranes
3. Stroma outside photosynthetic lamellae
4. Periplastidial space

Correct answer: Stroma outside photosynthetic lamellae

Solution

The dark reactions (Calvin cycle) occur in the stroma, where the enzymes needed for carbon fixation are present. Light reactions happen on thylakoid membranes, which generate ATP and NADPH used by the stroma.

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