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Photosynthesis in Higher Plants

Light Reactions of Photosynthesis Practice Questions

20 free Light Reactions of Photosynthesis practice questions for the NCERT Biology, 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 Light Reactions of Photosynthesis questions

20 questions
  1. Q1. Which of the following is the primary photosynthetic pigment that forms the reaction center in both Photosystem I and Photosystem II?
  2. Q2. During non-cyclic photophosphorylation, which molecule acts as the ultimate source of electrons to replace those lost by Photosystem II?
  3. Q3. In the Z-scheme of light reactions, the movement of electrons from PS II to PS I occurs through which of the following?
  4. Q4. Where is the Oxygen Evolving Complex (OEC) physically located in the chloroplast?
  5. Q5. Cyclic photophosphorylation results in the synthesis of which of the following products?
  6. Q6. The absorption peak for the reaction center of Photosystem I (P700) occurs at which wavelength?
  7. Q7. What is the primary role of accessory pigments like carotenoids during the light reactions?
  8. Q8. According to the Chemiosmotic Hypothesis, what drives the synthesis of ATP in the chloroplast?
  9. Q9. During the light reaction, protons (H+) accumulate in which part of the chloroplast?
  10. Q10. Which enzyme is responsible for the final step of non-cyclic electron transport, reducing NADP+ to NADPH?
  11. Q11. The 'Z-scheme' describes the pathway of electron flow from ________ to ________.
  12. Q12. Stroma lamellae membranes lack which of the following components?
  13. Q13. Which metal ion is a vital constituent of the chlorophyll molecule's porphyrin ring?
  14. Q14. In the thylakoid membrane, the CF1 part of the ATP synthase is located on:
  15. Q15. Which of the following is NOT a part of the Light Harvesting Complex (LHC)?
  16. Q16. When only PS I is functional, the electron is cycled back to the PS I complex from which electron carrier?
  17. Q17. How many protons are required to be pumped through the ATP synthase to produce one molecule of ATP in the chloroplast?
  18. Q18. Which of the following describes the correct sequence of electron flow in non-cyclic photophosphorylation?
  19. Q19. Manganese and Chloride ions are primarily associated with which process in photosynthesis?
  20. Q20. Which pigment appears as blue-green in a chromatogram?