Q1. Which factor affects the opening and closing of stomata, influencing photosynthesis?A. Oxygen concentrationB. TemperatureC. Water availabilityD. Chlorophyll content
Q2. Which of the following statements about photorespiration is correct?A. It enhances photosynthetic efficiency.B. It occurs at high CO2 concentrations.C. It involves oxygenation of RuBP by RuBisCO.D. It results in the production of ATP.
Q3. Which of the following is the first stable product of the C3 cycle?A. Phosphoglyceric acid (PGA)B. Oxaloacetic acid (OAA)C. Ribulose bisphosphate (RuBP)D. Phosphoenolpyruvate (PEP)
Q4. Which enzyme captures carbon dioxide in the C4 pathway?A. RuBisCOB. PEP carboxylaseC. NADP reductaseD. ATP synthase
Q5. In CAM plants, when does carbon dioxide fixation occur?A. During the dayB. Only in the morningC. At nightD. Throughout the day and night
Q6. Which of the following is an incorrect statement about the light-independent reactions?A. They occur in the stroma of the chloroplast.B. ATP and NADPH from light reactions are used.C. Carbon dioxide is fixed into organic molecules.D. Oxygen is released as a by-product.
Q7. In which part of the chloroplast does the Calvin cycle occur?A. Thylakoid membraneB. GranaC. StromaD. Lumen
Q8. Which step of the Calvin cycle requires both ATP and NADPH?A. CarboxylationB. ReductionC. RegenerationD. Oxygenation
Q9. Which of the following statements about CAM plants is correct?A. They open their stomata during the day.B. They store CO2 as organic acids at night.C. They do not undergo the Calvin cycle.D. They grow best in humid conditions.
Q10. Which pigment absorbs the maximum light energy for photosynthesis?A. Chlorophyll aB. Chlorophyll bC. CarotenoidsD. Xanthophylls