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In photosynthesis the light-independent reactions take place at:

1. Photosystem-I
2. Photosystem-II
3. Stromal matrix
4. Thylakoid lumen

Correct answer: Stromal matrix

Solution

The light-independent reactions (Calvin cycle) occur in the stroma, the chloroplast’s fluid matrix. This is where CO2 is fixed using ATP and NADPH made by the light-dependent reactions.

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