alleryWhich part of the chloroplast carries out the dark reaction (Calvin cycle)?
AOuter chloroplast envelope membrane
BThylakoid lumen inside the grana
CStroma surrounding the thylakoids
DInter-membrane space between envelopes
Answer & Solution
Correct answer: C. Stroma surrounding the thylakoids
1. The light reactions happen in the thylakoid membrane.
2. They produce ATP and NADPH that move into the stroma.
3. The Calvin cycle uses these to fix CO2 in the stroma.
4. So the dark reaction site is the stroma.
_Source: Selina Concise Biology Class 10, Ch on Photosynthesis (Mistral OCR'd PDF), section on dark reaction_
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