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Photosynthesis: Light and Dark Reactions - Competitive Exam Level

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This section is designed for students preparing for competitive examinations where deep conceptual clarity, precision, and speed are critical. It focuses on the high-weightage and frequently tested aspects of the light and dark reactions of photosynthesis, with emphasis on problem-solving and exam strategy.

In this section, you will study:

  • Detailed mechanism of light reactions with electron transport pathways

  • Cyclic and non-cyclic photophosphorylation in competitive exam context

  • Energy balance and stoichiometry of ATP and NADPH formation

  • Calvin cycle steps with numerical and assertion–reason questions

  • Photorespiration and its significance in competitive exams

  • Comparison-based questions on C3, C4, and CAM pathways

  • Tricky NCERT line-based MCQs and common misconceptions

  • Previous year question patterns and exam-oriented practice sets

The content is structured to improve speed, accuracy, and conceptual depth, helping students handle high-difficulty MCQs, multi-statement questions, and case-based problems in NEET and other competitive entrance examinations.

Master the light and dark reactions of photosynthesis with a competitive edge by focusing on precision, logic, and exam-oriented thinking.

Q. In which phase of photosynthesis is ATP synthesized?
  • A. Light-dependent reactions
  • B. Calvin cycle
  • C. Both A and B
  • D. None of the above
Q. What is the role of RuBisCO in photosynthesis?
  • A. To absorb light
  • B. To fix carbon dioxide
  • C. To produce ATP
  • D. To transport electrons
Q. What is the significance of the light-harvesting complexes?
  • A. To synthesize glucose
  • B. To absorb and transfer light energy
  • C. To produce oxygen
  • D. To fix carbon dioxide
Q. Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?
  • A. Rubisco
  • B. ATP synthase
  • C. NADP+ reductase
  • D. Phosphofructokinase
Q. Which of the following statements about the dark reactions is true?
  • A. They require light directly
  • B. They occur in the stroma
  • C. They produce oxygen
  • D. They are independent of temperature
Q. Which process occurs in the dark reactions of photosynthesis?
  • A. Photolysis of water
  • B. Carbon fixation
  • C. Light absorption
  • D. Electron transport chain
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