Q1. What is the role of the enzyme RuBisCO in photosynthesis?A. Fixation of CO₂ in the Calvin cycleB. Splitting of water moleculesC. Synthesis of ATPD. Reduction of NADP⁺
Q2. Which of the following is an incorrect statement about Photosystem I (PSI)?A. PSI absorbs light at 700 nm wavelength.B. Electrons from PSI reduce NADP+ to NADPH.C. Oxygen is evolved in PSI.D. It participates in cyclic and non-cyclic photophosphorylation.
Q3. What role does PEP carboxylase play in C4 plants?A. Fixes carbon dioxide into a four-carbon compoundB. Splits water moleculesC. Generates ATPD. Reduces NADP+
Q4. Which of the following does NOT occur during the light reactions of photosynthesis?A. ATP synthesisB. Splitting of waterC. Oxygen evolutionD. Glucose formation
Q5. Which molecule acts as an electron donor in oxygenic photosynthesis?A. NADPHB. WaterC. ChlorophyllD. ATP
Q6. Which of the following conditions favors photorespiration in C₃ plants?A. High CO₂ and low O₂ concentrationB. High O₂ and low CO₂ concentrationC. High light intensity and low temperatureD. Low light intensity and high humidity
Q7. Which of the following is the first stable product in the C4 pathway?A. 3-Phosphoglyceric acid (3-PGA)B. Oxaloacetic acid (OAA)C. Phosphoenolpyruvate (PEP)D. Ribulose bisphosphate (RuBP)
Q8. Which of the following statements about the light-dependent reactions of photosynthesis is correct?A. They occur in the stroma of the chloroplast.B. Water is split, releasing oxygen.C. NADH is produced during this process.D. Glucose is synthesized directly.
Q9. Which of the following statements about NADPH is correct?A. It captures light energy.B. It provides reducing power for the Calvin cycle.C. It directly synthesizes glucose.D. It splits water molecules.
Q10. Which product of the light reactions is directly used in the Calvin cycle?A. OxygenB. WaterC. NADPHD. Photon