Actual site of dark reaction in photosynthesis inside chloroplast is

Correct answer: (c) Stroma

Explanation

The dark reaction (Calvin Cycle) of photosynthesis occurs in the stroma, the fluid surrounding the grana of the chloroplast.

Enzymes in the stroma fix CO₂ into glucose using ATP and NADPH.

Grana/thylakoids host the light reaction, not the dark reaction.