The product of light reaction travel from:
Correct answer: D. Grana to stroma
- A. Cristae to stroma
- B. Stroma to grana
- C. Grana to cristae
- D. Grana to stroma
Explanation
Photosynthesis occurs in 2 steps:1. Light-dependent reactions2. Light-independent reactionsLight-dependent reactions occur on the thylakoid membrane (stacks of thylakoids are called grana) and involve the production of ATP and NADPH using light energy. ATP and NADPH are required for the Calvin cycle (light-independent reactions) which occurs within the stroma of the chloroplast. The Calvin cycle makes use of ATP and NADPH (from light-dependent reactions) and CO2 to synthesize sugars (triose phosphates). Thus, the products of light-dependent reactions travel from the grana to the stroma.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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