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CSS Botany QUESTION #1372
Question 1
In which part of the plant does the Calvin cycle occur?
  • Stroma of chloroplasts✔️
  • Thylakoid membrane
  • Cytoplasm
  • Nucleus
Correct Answer Explanation
The Calvin cycle (light-independent reactions / dark reactions) takes place in the stroma of chloroplasts — the fluid-filled space surrounding the thylakoids. Here, CO\(_2\) is fixed using ATP and NADPH (produced in the light reactions on the thylakoid membranes) to synthesise glucose via the enzyme RuBisCO. The light reactions occur on the thylakoid membranes.