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The dark reactions of photosynthesis occur in the

(a) granal thylakoid membranes Your answer
(b) stromal lamella membranes Your answer
(c) stroma outside the photosynthetic lamellae Correct
(d) periplastidial space Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

The dark reactions (Calvin cycle) need the enzymes of the stroma, so they occur in the stroma outside the thylakoids (photosynthetic lamellae).

Why the other options are wrong

(a) · your answer The granal thylakoid membranes carry the light reaction.
(b) · your answer Stroma lamellae membranes carry PS I for the light reaction, not the Calvin cycle.
(d) · your answer The space between the envelope membranes is not where carbon is fixed.

NCERT point: The light reaction and the dark reaction are in different places: membranes and stroma.

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