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Photosynthesis: Light and Dark Reactions - Higher Difficulty Problems

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This section is dedicated to challenging, high-difficulty problems based on the light and dark reactions of photosynthesis. It is designed for advanced Class 11–12 students, NEET aspirants targeting top ranks, and undergraduate learners who want to test and refine their conceptual mastery.

In this section, you will work on:

  • Multi-concept problems combining light reactions and the Calvin cycle

  • Numericals based on ATP, NADPH yield, and energy balance

  • Assertion–reason and multi-statement questions with close NCERT linkage

  • Graph- and data-based problems involving light intensity, CO₂ concentration, and temperature

  • Complex scenarios on photorespiration and RuBisCO regulation

  • Comparative problems on C3, C4, and CAM pathways

  • Previous-year inspired and NEET-level high-trap questions

The content is structured to strengthen analytical thinking, improve accuracy under pressure, and help students confidently tackle the most demanding questions in competitive exams and advanced assessments.

Train your mind to handle complexity and precision by mastering higher-difficulty problems in photosynthesis.

Q. How does the concentration of CO2 affect the rate of photosynthesis?
  • A. Increases it indefinitely
  • B. Has no effect
  • C. Increases it to a point, then levels off
  • D. Decreases it
Q. In which part of the chloroplast do the light-dependent reactions of photosynthesis occur?
  • A. Stroma
  • B. Thylakoid membranes
  • C. Outer membrane
  • D. Inner membrane
Q. What is the primary pigment involved in the light reactions of photosynthesis?
  • A. Chlorophyll a
  • B. Carotenoids
  • C. Chlorophyll b
  • D. Xanthophylls
Q. What is the primary role of ATP in photosynthesis?
  • A. To absorb light
  • B. To provide energy for reactions
  • C. To fix carbon
  • D. To transport electrons
Q. What is the role of ATP and NADPH produced in the light reactions?
  • A. To provide energy and reducing power for the Calvin cycle
  • B. To produce glucose directly
  • C. To transport water
  • D. To release oxygen
Q. Which molecule acts as the electron carrier in the light reactions?
  • A. NADP+
  • B. FADH2
  • C. ATP
  • D. RuBP
Q. Which molecule acts as the primary electron carrier in the light reactions?
  • A. NADP+
  • B. FADH2
  • C. ATP
  • D. ADP
Q. Which molecule is produced as a byproduct of the light-dependent reactions?
  • A. Glucose
  • B. Oxygen
  • C. NADPH
  • D. ATP
Q. Which of the following statements about the light-independent reactions is true?
  • A. They require light directly
  • B. They occur in the thylakoid membranes
  • C. They produce glucose
  • D. They release oxygen
Q. Which process occurs during the dark reactions of photosynthesis?
  • A. Photolysis of water
  • B. Carbon fixation
  • C. Light absorption
  • D. Oxygen release
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