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Physiology

Photosynthesis Practice Questions

20 free Photosynthesis practice questions for the Botany, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All Photosynthesis questions

20 questions
  1. Q1. Which specific pigment molecule acts as the primary reaction center in both Photosystem I and Photosystem II?
  2. Q2. During the light-dependent reactions, what is the primary source of electrons that replace those lost by Photosystem II?
  3. Q3. In which part of the chloroplast does the Calvin Cycle (light-independent reactions) take place?
  4. Q4. What is the primary function of the enzyme RuBisCO in the Calvin Cycle?
  5. Q5. Which of the following are the two main products of the light-dependent reactions that are required to power the Calvin Cycle?
  6. Q6. What is the primary byproduct of photosynthesis that is released into the atmosphere through the stomata?
  7. Q7. At what wavelength of light does the reaction center of Photosystem I (PSI) show its maximum absorption peak?
  8. Q8. CAM (Crassulacean Acid Metabolism) plants reduce photorespiration by:
  9. Q9. What is the name of the process that produces ATP using the proton gradient generated across the thylakoid membrane?
  10. Q10. Which molecule is the first stable product of carbon fixation in C3 plants?
  11. Q11. During non-cyclic electron flow, electrons follow which path?
  12. Q12. Which environmental factor, when increased, can lead to 'photorespiration' instead of photosynthesis in C3 plants?
  13. Q13. What is the structural difference between C4 plants and C3 plants that helps C4 plants avoid photorespiration?
  14. Q14. How many molecules of CO2 must enter the Calvin Cycle to produce one net molecule of Glyceraldehyde 3-phosphate (G3P)?
  15. Q15. In a chloroplast, where is the pH the lowest (most acidic) during active photosynthesis?
  16. Q16. Which pigment reflects green light, giving plants their characteristic color?
  17. Q17. Cyclic electron flow in the thylakoid membrane produces which of the following?
  18. Q18. Which of the following describes the role of NADP+ in photosynthesis?
  19. Q19. What is the primary carbohydrate stored by plants as a long-term energy reserve following photosynthesis?
  20. Q20. The 'light-independent' reactions are so-named because they: