alleryStart learning →Where in the plant cell do the light-independent reactions take place?
AIn the membrane of the thylakoid
BIn the cytoplasm of the mesophyll
CIn the stroma of the chloroplast
DIn the lumen of the thylakoid
Answer & Solution
Correct answer: C. In the stroma of the chloroplast
1. Carbon dioxide enters the leaves through stomata and reaches the mesophyll cells.
2. Once in the mesophyll cells it diffuses into the stroma of the chloroplast.
3. The stroma is the site of the light-independent reactions of photosynthesis.
4. The thylakoid membrane hosts the light-dependent reactions instead, so the two sites must not be swapped.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.3 Using Light Energy to Make Organic Molecules_
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